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  • 1.
    Ahmadkhaniha, Donya
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Lattanzi, Lucia
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Bonora, Fabio
    Department of Engineering, University of Ferrara, Via Saragat 1, Ferrara, 44122, Italy.
    Fortini, Annalisa
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Merlin, Mattia
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Zanella, Caterina
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    The effect of co-deposition of sic sub-micron particles and heat treatment on wear behaviour of ni–p coatings2021In: Coatings, ISSN 2079-6412, Vol. 11, no 2, p. 1-16, article id 180Article in journal (Refereed)
    Abstract [en]

    The purpose of the study is to assess the influence of SiC particles and heat treatment on the wear behaviour of Ni–P coatings when in contact with a 100Cr6 steel. Addition of reinforcing particles and heat treatment are two common methods to increase Ni–P hardness. Ball-on-disc wear tests coupled with SEM investigations were used to compare as-plated and heat-treated coatings, both pure and composite ones, and to evaluate the wear mechanisms. In the as-plated coatings, the presence of SiC particles determined higher friction coefficient and wear rate than the pure Ni–P coatings, despite the limited increase in hardness, of about 15%. The effect of SiC particles was shown in combination with heat treatment. The maximum hardness in pure Ni–P coating was achieved by heating at 400◦C for 1 h while for composite coatings heating for 2 h at 360◦C was sufficient to obtain the maximum hardness. The difference between the friction coefficient of composite and pure coatings was disclosed by heating at 300◦C for 2 h. In other cases, the coefficient of friction (COF) stabilised at similar values. The wear mechanisms involved were mainly abrasion and tribo-oxidation, with the formation of lubricant Fe oxides produced at the counterpart.

  • 2.
    Bogdanoff, Toni
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Lattanzi, Lucia
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Merlin, M.
    Department of Engineering, University of Ferrara, Via Giuseppe Saragat 1, Ferrara, 44122, Italy.
    Ghassemali, Ehsan
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    The complex interaction between microstructural features and crack evolution during cyclic testing in heat-treated Al–Si–Mg–Cu cast alloys2021In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 825, article id 141930Article in journal (Refereed)
    Abstract [en]

    The study aimed to investigate crack initiation and propagation at the micro-scale in heat-treated Al–7Si–Mg cast alloys with different copper (Cu) contents. In-situ cyclic testing in a scanning electron microscope coupled with electron back-scattered diffraction and digital image correlation was used to evaluate the complex interaction between the crack path and the microstructural features. The three-nearest-neighbour distance of secondary particles was a new tool to describe the crack propagation in the alloys. The amount of Cu retained in the α-Al matrix after heat treatment increased with the Cu content in the alloy and enhanced the strength with a slight decrease in elongation. During cyclic testing, the two-dimensional (2D) crack path appeared with a mixed propagation, both trans- and inter-granular, regardless of the Cu content of the alloy. On fracture surfaces, multiple crack initiation points were detected along the thickness of the samples. The debonding of silicon (Si) particles took place during crack propagation in the Cu-free alloy, while cracking of Si particles and intermetallic phases occurred in the alloy with 3.2 wt% Cu. Three-dimensional tomography using focused ion beam revealed that the improved strength of the α-Al matrix changes the number of cracked particles ahead of the propagating crack with Cu concentration above 1.5 wt%.

  • 3.
    Bogdanoff, Toni
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Lattanzi, Lucia
    Department of Engineering, University of Ferrara, Italy.
    Merlin, Mattia
    Department of Engineering, University of Ferrara, Italy.
    Ghassemali, Ehsan
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Seifeddine, Salem
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    The influence of copper addition on crack initiation and propagation in an Al–Si–Mg alloy during cyclic testing2020In: Materialia, E-ISSN 2589-1529, Vol. 12, article id 100787Article in journal (Refereed)
    Abstract [en]

    The effect of copper (Cu) addition up to 3.2 wt% on crack initiation and propagation in an Al–Si–Mg cast alloy was investigated using in-situ cyclic testing in the as-cast condition. A combination of digital image correlation, electron backscatter diffraction, and scanning electron microscopy was used to investigate crack initiation and propagation behaviour during in-situ cyclic testing. The results showed that Cu-rich intermetallic compounds with the addition of Cu up to 1.5 wt% do not affect the fatigue behaviour of these alloys, and that crack propagation in these cases is trans-granular and trans-dendritic. However, increasing the concentration of the Cu retained in the primary α-Al matrix in solid solution and Cu-containing precipitates delayed crack propagation during cyclic testing. The results showed that strain accumulation was highest at the grain boundaries; however, the crack preferred to propagate along or across primary α-Al dendrites due to the relatively lower mechanical strength of the matrix compared to the eutectic and intermetallic phases. Moreover, the addition of Cu of more than 3.0 wt% to Al-Si-Mg alloys changes the fatigue behaviour that a rapid failure occurs. 

  • 4.
    Du, A.
    et al.
    Institute of Semi-Solid Metal Technology, China Academy of Machinery Sciences and Technology (Jiangle), No. 22 Huancheng East Road, Jiangle, Sanming, 353300, China.
    Lattanzi, Lucia
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Zheng, J.
    Institute of Semi-Solid Metal Technology, China Academy of Machinery Sciences and Technology (Jiangle), No. 22 Huancheng East Road, Jiangle, Sanming, 353300, China.
    Wang, K.
    Department of Materials Processing and Control Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road No. 30, Beijing, 100083, China.
    Yu, G.
    Institute of Semi-Solid Metal Technology, China Academy of Machinery Sciences and Technology (Jiangle), No. 22 Huancheng East Road, Jiangle, Sanming, 353300, China.
    On the hardness and elastic modulus of phases in SiC-reinforced Al composite: Role of La and Ce addition2021In: Materials, E-ISSN 1996-1944, Vol. 14, no 21, article id 6287Article in journal (Refereed)
    Abstract [en]

    The use of silicon carbide particles (SiCp) as reinforcement in aluminium (Al)-based composites (Al/SiCp) can offer high hardness and high stiffness. The rare-earth elements like lanthanum (La) and cerium (Ce) and transition metals like nickel (Ni) and copper (Cu) were added into the matrix to form intermetallic phases; this is one way to improve the mechanical property of the composite at elevated temperatures. The α-Al15 (Fe,Mn)3 Si2, Al20 (La,Ce)Ti2, and Al11 (La,Ce)3, π-Al8 FeMg3 Si6 phases are formed. Nanoindentation was employed to measure the hardness and elastic modulus of the phases formed in the composite alloys. The rule of mixture was used to predict the modulus of the matrix alloys. The Halpin–Tsai model was applied to calculate the elastic modulus of the particle-reinforced composites. The transition metals (Ni and Cu) and rare-earth elements (La and Ce) determined a 5–15% increase of the elastic modulus of the matrix alloy. The SiC particles increased the elastic modulus of the matrix alloy by 10–15% in composite materials.

  • 5.
    Du, A.
    et al.
    University of Science and Technology Beijing, School of Materials Science and Engineering, Department of Materials Processing and Control Engineering, Xueyuan Road 30, Haidian District, Beijing, 100083, China.
    Lattanzi, Lucia
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Zheng, J.
    China Academy of Machinery Sciences and Technology (Jiangle) Institute of Semi-solid Metal Technology, Huancheng East Road 22, Jiangle County, Fujian Province, Sanming City, 353300, China.
    Wang, K.
    University of Science and Technology Beijing, School of Materials Science and Engineering, Department of Materials Processing and Control Engineering, Xueyuan Road 30, Haidian District, Beijing, 100083, China.
    Yu, G.
    China Academy of Machinery Sciences and Technology (Jiangle) Institute of Semi-solid Metal Technology, Huancheng East Road 22, Jiangle County, Fujian Province, Sanming City, 353300, China.
    Role of matrix alloy, reinforcement size and fraction in the sliding wear behaviour of Al-SiCp MMCs against brake pad material2023In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 530-531, article id 204969Article in journal (Refereed)
    Abstract [en]

    Aluminium metal matrix composites were produced by a newly developed stirring device for stir casting with different matrix alloys, SiC particle fractions and sizes to investigate these parameters' influence on the materials' wear performance. The wear performance of the composites was evaluated with dry sliding pin-on-plate tests against a high-speed train brake pad, and the study of wear surfaces was completed by electron microscopy. The formation of an iron-based tribolayer during wear protected the metal matrix composite from further wear damage. The composite reinforced with 19% SiC particles sized 32 μm showed an increasing coefficient of friction during wear, and the wear surface showed traces of third body wear. The rare earth and transition metal added to the matrix alloy increased the hardness of the composite, and the intermetallic phases reduced the development of the Fe-based tribolayer. The composites with small SiC particles presented the Fe transfer on the exposed aluminium surface, with a lower wear rate and friction coefficient than other composites. The direct comparison of composites produced with different sizes of SiC particles highlighted that the relationship between the wear rate and the coefficient of friction of the composites and the brake pad showed a linear trend.

  • 6.
    Du, Andong
    et al.
    Department of Materials Processing and Control Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Haidian District, Beijing, China; China Academy of Machinery Sciences and Technology (Jiangle) Institute of Semi-Solid Metal Technology, Jiangle County, Sanming, China.
    Lattanzi, Lucia
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. China Academy of Machinery Sciences and Technology (Jiangle) Institute of Semi-Solid Metal Technology, Jiangle County, Sanming, China.
    Zheng, Jinchuan
    China Academy of Machinery Sciences and Technology (Jiangle) Institute of Semi-Solid Metal Technology, Jiangle County, Sanming, China.
    Wang, Kaikun
    Department of Materials Processing and Control Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Haidian District, Beijing, China.
    Yu, Gegang
    China Academy of Machinery Sciences and Technology (Jiangle) Institute of Semi-Solid Metal Technology, Jiangle County, Sanming, China.
    On the efficient particle dispersion and transfer in the fabrication of SiC-particle-reinforced aluminum matrix composite2023In: Crystals, ISSN 2073-4352, Vol. 13, no 12, article id 1621Article in journal (Refereed)
    Abstract [en]

    Lightweight SiC-particle-reinforced aluminum composites have the potential to replace cast iron in brake discs, especially for electric vehicles. This study investigates the effect of SiC particle size and matrix alloy composition on the resulting transfer efficiency and particle distribution. The performance of a specially designed stirring head was studied using a water model, and the stirring head conditions were assessed to understand the particle transfer and dispersion mechanisms in the molten aluminum. The standard practice of thermal pre-treatment promotes the wetting of the reinforcing particles and commonly causes clustering before the addition to the melt. This early clustering affects the transfer efficiency and particle dispersion, where their interaction with the melt top-surface oxide skin plays an important role. In addition, the transfer efficiency was linked to the particle size and the chemical composition of the matrix alloy. Smaller particles aggravated the degree of clustering, and the addition of rare earth elements as alloying elements in the matrix alloy affected the particle dispersion. The stirring parameters should be selected to ensure cluster disruption when the carbides are added to the melt.

  • 7.
    Du, Andong
    et al.
    Department of Materials Processing and Control Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing 100083, China; Institute of Semi-Solid Metal Technology, China Academy of Machinery Sciences and Technology (Jiangle), Huancheng East Road 22, Jiangle County, Sanming 353300, China.
    Lattanzi, Lucia
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Institute of Semi-Solid Metal Technology, China Academy of Machinery Sciences and Technology (Jiangle), Huancheng East Road 22, Jiangle County, Sanming 353300, China.
    Zhou, Jie
    Jiangsu University of Technology, Zhongwu Road 1801, Changzhou 213001, China.
    Zheng, Jinchuan
    Institute of Semi-Solid Metal Technology, China Academy of Machinery Sciences and Technology (Jiangle), Huancheng East Road 22, Jiangle County, Sanming 353300, China.
    Wang, Kaikun
    Department of Materials Processing and Control Engineering, School of Materials Science and Engineering, University of Science and Technology Beijing, Xueyuan Road 30, Haidian District, Beijing 100083, China.
    Yu, Gegang
    Institute of Semi-Solid Metal Technology, China Academy of Machinery Sciences and Technology (Jiangle), Huancheng East Road 22, Jiangle County, Sanming 353300, China.
    The Influence of Ce, La, and SiC Particles Addition on the Formability of an Al-Si-Cu-Mg-Fe SiCp-MMC2022In: Materials, E-ISSN 1996-1944, Vol. 15, no 11, article id 3789Article in journal (Refereed)
    Abstract [en]

    Road transport and the associated fuel consumption plays a primary role in emissions. Weight reduction is critical to reaching the targeted reduction of 34% in 2025. Weight reduction in moving parts, such as pistons and brake disc rotors, provide a high-impact route to achieve this goal. The current study aims to investigate the formability of Al–Si alloys reinforced with different fractions and different sizes of SiCp to create an efficient and lightweight Al-MMC brake disk. Lanthanum (La) and cerium (Ce) were added to strengthen the aluminium matrix alloy and to improve the capability of the Al-MMC brake discs to withstand elevated temperature conditions, such as more extended braking periods. La and Ce formed intermetallic phases that further strengthened the composite. The analysis showed the processability and thermal stability of the different material’s combinations: increased particle sizes and broader size range mixture supported the formation of the SiCp particle interactions, acting as an internal scaffolding. In conclusion, the additions of Ce and La strengthened the softer matrix regions and resulted in a doubled compression peak strength of the material without affecting the formability, as demonstrated by the processing maps.

  • 8.
    Lattanzi, Lucia
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Awe, S.
    Automotive Components Floby AB.
    Jansson, P.
    Comptech i Skillingaryd.
    Westergård, R.
    Gränges Finspång.
    Sjögren, T.
    RISE, Borås, Sweden.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    The possibility of using secondary alloys for producing aluminium matrix composite components2023Conference paper (Refereed)
    Abstract [en]

    Aluminium-based metal matrix composites (MMCs) are valid candidates to substitute cast iron in the production of automobile brake discs. These materials provide good tribological performance and suitable thermophysical properties combined in a lightweight solution. The two main challenges lie in the high-temperature mechanical properties and the recyclability of the composite at the product’s end-of-life. Aluminium gives the opportunity of using secondary alloys in the production of these MMCs. The drawback is that secondary aluminium alloys usually include several impurities and oxides that can harm mechanical and thermophysical properties. The present study focuses on characterising Al-Si-based MMCs reinforced with 20 wt.% of SiC particles. The composites are produced by squeeze casting using 100 % of secondary alloy for the matrix and are compared to the current solution developed for light brake discs. The critical material properties for brake discs are good thermal conductivity and suitable coefficient of friction. The microstructure of the MMC produced with secondary alloy presented a higher number of clustered SiC particles, probably related to the presence of oxide films that wrap the carbides and hinder their dispersion in the melt. The presence of oxide-related porosities affected the thermal conductivity of the composites produced with secondary alloys, with a reduction in thermal conductivity of 15 % from 147 to 125 W/m*K at room temperature. The reduction was maintained with increasing temperature up to 500 °C. The wear performance was tested at room temperature with a pin-on-plate tribometer against the brake pad material. The coefficient of friction did not change with the presence of the recycled matrix alloy, reaching a maximum value of 0.2 over 4 hours of testing. The wear surface on the MMC presents a tribo-layer that develops at the beginning of the wear test and maintains a stable coefficient of friction over time.

  • 9.
    Lattanzi, Lucia
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Awe, Samuel Ayowole
    Automotive Components Floby AB, Floby, Sweden.
    Thermophysical properties of Al-based metal matrix composites suitable for automotive brake discs2024In: Journal of Alloys and Metallurgical Systems, E-ISSN 2949-9178, Vol. 5, article id 100059Article in journal (Refereed)
    Abstract [en]

    The present work investigates the effects of Ni, Cu, La, and Ce on the thermophysical properties of aluminium-based metal matrix composites. Transition metals and rare-earth elements were added to improve the mechanical performance of the material to above 420 °C, which is the maximum operating temperature of the reference material. In contrast, the addition of alloying elements results in the formation of intermetallic phases, Al3Ni and Al11(La,Ce)3, which, in turn, affect the thermal and physical properties of the base alloy. The goal is to apply the improved composites to automotive brake discs. The addition of alloying elements decreased the thermal conductivity by 20% and increased the stiffness by 90% at temperatures up to 470 °C. When stiffness and thermal conductivity are critical requirements, the addition of these alloying elements represents a valid solution.

  • 10.
    Lattanzi, Lucia
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Awe, Samuel Ayowole
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jansson, P.
    Rudenstam, C.
    Westergård, R.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Aluminium matrix composites for lightweight components2023Conference paper (Refereed)
  • 11.
    Lattanzi, Lucia
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Etienne, Andrea
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. ENSICAEN, Caen, France.
    Li, Ziyu
    Jönköping University, School of Engineering.
    Chandrashekar, Gnanesh T.
    Jönköping University, School of Engineering.
    Gonapati, Santosh R.
    Jönköping University, School of Engineering.
    Awe, Samuel A.
    Automotive Components Floby AB, Floby, Sweden.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    The effect of Ni and Zr additions on hardness, elastic modulus and wear performance of Al-SiCp composite2022In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 169, article id 107478Article in journal (Refereed)
    Abstract [en]

    The strive for lightweight in the automotive industry points to aluminium metal matrix composites as substitutes of cast iron in brake discs. The wear performance of the material is critical, besides suitable mechanical resistance and thermal properties. The present study investigated the wear behaviour of Al-Si alloys reinforced with silicon carbide particles. The matrix alloy was added with nickel and zirconium, and nanoindentation was performed to determine intermetallic phases' hardness and elastic modulus. The addition of 20 wt% carbides determined an elastic modulus 35–40 % higher than the matrix alloys. Wear rate was in the 2–8 * 10-5 mm3/N * m range for all materials. The tribo-layer had a critical role in the wear performance, as the coefficient of friction decreased during wear.

  • 12.
    Lattanzi, Lucia
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Etienne, Andrea
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. ENSICAEN, Caen, France.
    Li, Ziyu
    Jönköping University, School of Engineering.
    Manjunath, Tushar
    Jönköping University, School of Engineering.
    Nixon, Nirmal
    Jönköping University, School of Engineering.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Awe, Samuel A.
    Automotive Components Floby AB, Floby, Sweden.
    The influence of Ni and Zr additions on the hot compression properties of Al-SiCp composites2022In: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 905, article id 164160Article in journal (Refereed)
    Abstract [en]

    The present work investigates different additions of nickel and zirconium to the matrix alloy of Al-SiC metal matrix composites to enhance their high-temperature performance. These composites are promising for the demand for lightweight solutions for automotive components like brake discs. In such components, the compression behaviour at elevated temperatures is crucial. The resulting properties were combined with microstructural analysis. Ni additions led to a continuous improvement of the mechanical response, but the same result did not hold for the Zr additions. The interaction of SiC particles, eutectic silicon, and eutectic Ni-based phases led to a 44 % increment of the activation energy.

  • 13.
    Lattanzi, Lucia
    et al.
    University of Ferrara, Department of Engineering, Ferrara, Italy.
    Fabrizi, A.
    University of Padua, Department of Management and Engineering, Vicenza, Italy.
    Fortini, A.
    University of Ferrara, Department of Engineering, Ferrara, Italy.
    Merlin, M.
    University of Ferrara, Department of Engineering, Ferrara, Italy.
    Timelli, G.
    University of Padua, Department of Management and Engineering, Vicenza, Italy.
    Effects of microstructure and casting defects on the fatigue behavior of the high-pressure die-cast AlSi9Cu3(Fe) alloy2017In: 3rd International Symposium on Fatigue Design and Material Defects (FDMD 2017) / [ed] S. Beretta, S. Foletti, G. Nicoletto & R. Tovo, Elsevier, 2017, p. 505-512Conference paper (Refereed)
    Abstract [en]

    High-pressure die-cast (HPDC) components are being increasingly used due to good flexibility and high productivity. These aspects make HPDC suitable to produce several mass components, especially for the automotive sector. Due to the rapid filling of the die and high cooling rate, the process generally leads to the formation of a wide variety of defects, such as porosity and oxide films. Such defects might act as starting points for fatigue cracks and thus deteriorating the fatigue behavior of the casting. To this respect, the fatigue behavior of die cast aluminum alloys is an important aspect to consider when assessing the performance of complex castings for automotive applications. In the light of these aspects, the goal of this work is to describe how the microstructure affects the fatigue crack initiation and propagation. Die cast AlSi9Cu3(Fe) specimens were produced by means of a specifically designed die and the microstructure was preliminary characterized. Uniaxial fatigue tests were performed at load control with a stress ratio of R = 0.1 and at a single level of stress amplitude. After the fatigue tests, the samples were investigated to assess the propagation of the fatigue cracks; the starting points of cracks were specifically identified and the obtained data suggested how defects strongly influence the damage mechanism of the material.

  • 14.
    Lattanzi, Lucia
    et al.
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Giovanni, Maria T. D.
    Department of Engineering and Architecture, University of Parma, Parma, Italy.
    Giovagnoli, Maverick
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Fortini, Annalisa
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Merlin, Mattia
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Casari, Daniele
    Brembo SpA, Mapello, Italy.
    Sabatino, Marisa D.
    Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim, Norway.
    Cerri, Emanuela
    Department of Engineering and Architecture, University of Parma, Parma, Italy.
    Garagnani, Gian L.
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Room temperature mechanical properties of A356 alloy with Ni additions from 0.5 Wt to 2 Wt%2018In: Metals, ISSN 2075-4701, Vol. 8, no 4, article id 224Article in journal (Refereed)
    Abstract [en]

    In recent years, the influence of Ni on high-temperature mechanical properties of casting Al alloys has been extensively examined in the literature. In the present study, room temperature mechanical properties of an A356 alloy with Ni additions from 0.5 to 2 wt % were investigated. The role of Ni-based compounds and eutectic Si particles in reinforcing the Al matrix was studied with image analysis and was then related to tensile properties and microhardness. In the as-castcondition, the formation of the 3D network is not sufficient to determine an increase of mechanical properties of the alloys since fracture propagates by cleavage through eutectic Si particles and Ni aluminides or by the debonding of brittle phases from the aluminum matrix. After T6 heat treatmentthe increasing amount of Ni aluminides, due to further addition of Ni to the alloy, together withtheir brittle behavior, leads to a decrease of yield strength, ultimate tensile strength, and Vickers microhardness. Despite the fact that Ni addition up to 2 wt % hinders spheroidization of eutectic Si particles during T6 heat treatment, it also promotes the formation of a higher number of brittle Ni-based compounds that easily promote fracture propagation. 

  • 15.
    Lattanzi, Lucia
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Awe, Samuel A.
    Automotive Components Floby AB, Floby, Sweden.
    On the possibility of using secondary alloys in the production of aluminum-based metal matrix composite2024In: Crystals, ISSN 2073-4352, Vol. 14, no 4, article id 333Article in journal (Refereed)
    Abstract [en]

    Aluminum-based composites provide tribological performance and thermophysical properties that, combined with being lightweight, are suitable for their application in automotive brake discs. Aluminum alloys allow the use of secondary materials to produce composites, with the drawback of several elements, impurities, and oxides that can harm the mechanical and thermophysical properties. This preliminary study explored the mechanical and thermophysical performance of a composite material produced with a secondary matrix alloy. Overall, the results are promising, with a minimal decrease in mechanical and thermophysical properties despite clustered silicon carbide particles in the composite with the secondary matrix. The challenges in effectively dispersing carbides in the melt seem linked to aluminum oxides, and future microstructural investigations will aim to clarify this aspect.

  • 16.
    Lattanzi, Lucia
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Department of Engineering, University of Ferrara, Ferrara, Italy.
    Merlin, Mattia
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Fortini, Annalisa
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Morri, Alessandro
    Department of Industrial Engineering, Alma Mater and Studiorum, University of Bologna, Bologna, Italy.
    Garagnani, Gian Luca
    Department of Engineering, University of Ferrara, Ferrara, Italy.
    Effect of Thermal Exposure Simulating Vapor Deposition on the Impact Behavior of Additively Manufactured AlSi10Mg Alloy2022In: Journal of materials engineering and performance (Print), ISSN 1059-9495, E-ISSN 1544-1024, Vol. 31, p. 2859-2869Article in journal (Refereed)
    Abstract [en]

    The present work focuses on the evolution of hardness and impact toughness after thermal exposure at high temperatures of the AlSi10Mg alloy produced by selective laser melting. The thermal exposure simulated the vapor deposition of coatings on aluminum alloys. The aim is to assess the possibility of combining the ageing step of heat treatments and the deposition treatment. The alloy was aged at 160 and 180 °C for up to 4 hours, both directly and after an innovative rapid solution treatment. Direct ageing had no significant effects on the microstructure, showing an almost constant hardness trend. These results accord with the impact properties, which showed a negligible difference in the impact toughness of the direct aged and the as-built samples. The same ageing treatments performed after rapid solution treatment induced age hardening in the alloy. The hardness values were lower by 38% than those of the directly aged samples. The innovative solution treatment positively affected impact toughness, which increased by 185% compared to the directly aged material. These results highlight that the ageing step can be integrated with the vapor deposition process. Moreover, the heat treatment is suitable for components requiring high impact strength after coating.

  • 17.
    Li, Ziyu
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Comptech i Skillingaryd AB, P.O. Box 28, Skillingaryd, 568 31, Sweden.
    Tan, He
    Jönköping University, School of Engineering, JTH, Department of Computing, Jönköping AI Lab (JAIL).
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jansson, P.
    Comptech i Skillingaryd AB, P.O. Box 28, Skillingaryd, 568 31, Sweden.
    Lattanzi, Lucia
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Smart-Cast: An AI-Based System for Semisolid Casting Process Control2024In: Procedia Computer Science, E-ISSN 1877-0509, Vol. 232, p. 2440-2447Article in journal (Refereed)
    Abstract [en]

    To satisfy the rising demand for higher product quality and giga-casting requirements, the casting process is undergoing significant changes. However, current control methods rely significantly on human expertise and experience, making process availability and stability difficult to ensure. The semisolid casting process is more complicated than conventional liquid casting due to the additional casting parameters incorporated during the slurry preparation, which can have an effect on the quality of the final product. Therefore, an efficient tool is required to simplify the complete process of semisolid casting. The introduction of an AI system to aid in the supervision of the casting manufacturing procedure is one potential solution. This paper introduces a new casting system named”Smart-Cast” developed for this specific purpose. The paper describes the functions of the system and its current development process. Using an AI system as an assistant can help to achieve the goal of enhancing the efficacy of casting process control, and it can also help foundries step into the Industry 4.0 era.

  • 18.
    Li, Ziyu
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing. COMPtech AB i skillingaryd.
    Tan, He
    Jönköping University, School of Engineering, JTH, Department of Computing, Jönköping AI Lab (JAIL).
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Lattanzi, Lucia
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jansson, Per
    COMPtech AB i skillingaryd.
    Enhancing Rheocasting Process Control with AI-based Systems2023Conference paper (Refereed)
    Abstract [en]

    Semisolid casting has emerged as an attractivealternative to conventional casting methods due to its potentialto yield superior mechanical properties, reduce environmentalpollution, and decrease production costs. However, optimizingprocess parameters and controlling the casting process remainschallenging. Process control largely relies on human expertise,associated with significant time and cost expenditures. Inresponse, this study presents a third-circle research project toinvestigate the correlation between the casting process and thesolidification process. The study proposes leveraging AI technologyto digitize the entire process control, thereby increasing thereliability and stability of cast products’ quality. The researchwill focus on understanding the key factors influencing thecasting process and developing an AI-based decision supportsystem to aid in process parameter selection and optimization.The outcomes of this study are expected to contribute to thedevelopment of more reliable and efficient semisolid castingprocesses.

  • 19.
    Li, Ziyu
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Tan, He
    Jönköping University, School of Engineering, JTH, Department of Computing, Jönköping AI Lab (JAIL).
    Lattanzi, Lucia
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jansson, P.
    Comptech i Skillingaryd AB, P.O. Box 28, Skillingaryd, 568 31, Sweden.
    On the Possibility of Replacing Scheil-Gulliver Modeling with Machine Learning and Neural Network Models2023In: Solid State Phenomena / [ed] A. Pola, M. Tocci and A. Rassili, Trans Tech Publications, 2023, Vol. 347, p. 157-163Chapter in book (Refereed)
    Abstract [en]

    Resource-efficient manufacturing is a foundation for sustainable and circular manufacturing. Semi-solid processing typically reduces material loss and improves productivity but generally requires a better understanding and control of the solidification of the cast material. Thermal analysis is commonly used in high-pressure die casting (HPDC) processes to determine casting process parameters, such as liquidus and solidus temperatures. However, this method is inadequate for semi-solid casting processes because the eutectic temperature is also a crucial parameter for successful semi-solid casting. This study explores the feasibility of using machine learning and artificial neural networks to predict fundamental values in Al-Si alloy casting. The Thermo-Calc 2022 software Scheil-Gulliver calculation function was used to generate the training and the test datasets, which included features such as melting temperature, alpha aluminium solidification temperature, eutectic temperature, and the solid fraction amounts at eutectic temperature. The results show that both models have a symmetric mean absolute percentage error (SMAPE) of less than 2 % with temperature prediction, with the machine learning model achieving a better accuracy of less than 1 %. A case study comparing practical measurements with prediction results is also discussed, demonstrating the potential of AI methods for predicting semi-solid casting processes.

  • 20.
    Li, Ziyu
    et al.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Tan, He
    Jönköping University, School of Engineering, JTH, Department of Computing, Jönköping AI Lab (JAIL).
    Lattanzi, Lucia
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Jansson, P.
    On the possibility of replacing Scheil-Gulliver modelling with machine learning and neural network models2023Conference paper (Refereed)
  • 21.
    Windmark, Christina
    et al.
    Production and Materials Engineering, Lund University.
    Lattanzi, Lucia
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Månberger, André
    Environmental and Energy Systems Studies, Lund University.
    Jarfors, Anders E.W.
    Jönköping University, School of Engineering, JTH, Materials and Manufacturing.
    Investigation on resource-efficient aluminium recycling – A state of the art review2022In: SPS2022: Proceedings of the 10th Swedish production symposium / [ed] A. H. C. Ng, A. Syberfelt, D. Högberg & M. Holm, Amsterdam: IOS Press, 2022, p. 15-27Conference paper (Refereed)
    Abstract [en]

    Recycling is an important area to improve to reduce negative impact on the environment. With increased material recovery, less virgin materials are needed to provide the same benefits for the society. Aluminium is an important metal in the efforts to reduce negative climate impact. Demand for wrought aluminium will heavily increase with electrification of vehicles. However, with today’s recycling, contamination of aluminium alloys results in significant losses where wrought aluminium products are downcycled to cast aluminium with lower value and performance. This paper review the state of the art of aluminium recycling and investigate the current knowledge on the recyclability of current important aluminium alloys and their alloying elements. Future implementations and research are explored to find possible road maps for a sustainable circular economy of aluminium products. The findings indicate that closed-loop recycling trough better developed sorting and separation processes are one of the primary improvement directions. Also, improve utilization of the alloys and their alloying elements in the making of new aluminium alloys.

1 - 21 of 21
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