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  • 1.
    Ahmadkhaniha, Donya
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Eriksson, Fredrik
    Linkopings universitet, Department of Physics, Linkoping, Sweden.
    Leisner, Peter
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning. RISE Research Institute of Sweden, Borås, Sweden.
    Zanella, Caterina
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Effect of SiC particle size and heat-treatment on microhardness and corrosion resistance of NiP electrodeposited coatings2018Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 769, s. 1080-1087Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Electrodeposition of NiP composite coatings with nano and sub-micron sized SiC has been carried out to investigate the possibility of replacing hard chromium coatings. The composition and structure of the coatings were evaluated by energy dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis, respectively. Microhardness was measured by Vickers indentation and polarization measurements were carried out to study the corrosion behavior of the coatings. The results showed that submicron particles can be codeposited with a higher content as compared to nano sized ones. However, even if a smaller amount of the nano-sized SiC particles are incorporated in the coating, the contribution to an increasing microhardness was comparable with the submicron sized particles, which can be related to the higher density of codeposited particles. SiC particles did not change the anodic polarization behavior of NiP coatings in a 3.5% NaCl solution. Finally, the effect of heat-treatment on the coatings properties at 400 °C for 1 h was studied to investigate the contribution of particles and heat-treatment on hardness and corrosion properties. It was found that the heat-treatment doubled the microhardness and changed the anodic polarization behavior of the coatings from passive to active with respect to the as-plated conditions.

    Publikationen är tillgänglig i fulltext från 2020-08-04 00:00
  • 2.
    El-Mahallawy, N.
    et al.
    Ain-Sham University, Faculty of Engineering, Cairo, Egypt.
    Taha, M. A.
    Ain-Sham University, Faculty of Engineering, Cairo, Egypt.
    Jarfors, A. E. W.
    Royal Institute of Technology, Department of Materials Processing, Stockholm, Sweden.
    Fredriksson, H.
    Royal Institute of Technology, Department of Materials Processing, Stockholm, Sweden.
    On the reaction between aluminum, K2TiF6 and KBF41999Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 292, nr 1-2, s. 221-229Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The reaction between molten Al and KBF4 and K2TiF6 was analyzed. Additions of the two salts separately, consecutively and simultaneously were made at 800 and 1000 °C. The phases formed were identified and their morphology investigated. When adding K2TiF6 emulsification of the salt occurs. Residual salt containing K, Ti, Al and O was found in addition to slag containing K, Al and O. In an emulsified region, a new globular morphology of Al3Ti-type was found. No evidence of emulsification of KBF4 was found. This implies that the two salts react individually with Al. A new morphology of AlB2, in the form of thin plates, formed presumably at the salt/aluminum interface, was also found.

  • 3.
    Fjellstedt, J.
    et al.
    Royal Institute of Technology, Department of Materials Processing, Casting of Metals, Stockholm, Sweden.
    Jarfors, A. E. W.
    Royal Institute of Technology, Department of Materials Processing, Casting of Metals, Stockholm, Sweden.
    Svendsen, L.
    Royal Institute of Technology, Department of Materials Processing, Casting of Metals, Stockholm, Sweden.
    Experimental analysis of the intermediary phases AlB2, AlB12 and TiB2 in the Al-B and Al-Ti-B systems1999Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 283, nr 1-2, s. 192-197Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The phases AlB2, AlB12 and TiB2 were studied in Al-rich Al-B and Al-Ti-B alloys produced by several different sample fabrication methods. The samples were examined using light optical microscopy (LOM), energy dispersive X-ray spectroscopic analysis (EDS) and X-ray diffraction analysis (XRD). The results indicate that only a limited solubility of Al in TiB2 and Ti in AlB2 exists, hence a continuous compound (Al,Ti)B2 is not stable. © 1999 Elsevier Science S.A. All rights reserved.

  • 4.
    Ghassemali, Ehsan
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning. Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Sonkusare, Reshma
    Indian Institute of Technology, India.
    Biswas, Krishanu
    Indian Institute of Technology, India.
    Gurao, Nilesh P.
    Indian Institute of Technology, India.
    In-situ study of crack initiation and propagation in a dual phase AlCoCrFeNi high entropy alloy2017Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 710, s. 539-546Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    This study reports the effect of phase distribution on crack propagation in a dual phase AlCoCrFeNi high entropy alloy (HEA) under tensile loading. The alloy is characterized by the presence of a brittle disordered BCC phase that can be toughened by precipitation of a ductile FCC phase during homogenization heat treatment. The stress and strain partitioning between the two phases is of paramount importance to determine the mechanical response of this alloy. The as-cast alloy was subjected to homogenization at 1273 K for 6 h to prevent the formation of detrimental sigma phases and to precipitate the ductile FCC phase. In-situ tensile test in a scanning electron microscope with an electron backscatter diffraction facility was carried out to understand the micro-mechanisms of deformation of the alloy. Precipitation of the FCC phase at the BCC grain boundaries reflected the effect of the FCC phase on crack deflection and branching during propagation. The strain partitioning between the two phases and the evolution of misorientation distribution was investigated. It is observed that the presence of ductile FCC high entropy phase can impart good room temperature ductility to the brittle BCC phase. As there are very few investigations performed on the dual phase HEAs, a proper microstructural design can be be achieved and can be utilized to toughen the brittle HEAs.

  • 5.
    Ghatei Kalashami, A.
    et al.
    Isfahan University of Technology, Iran.
    Kermanpur, A.
    Isfahan University of Technology, Iran.
    Ghassemali, Ehsan
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Najafizadeh, A.
    Isfahan University of Technology, Iran.
    Mazaheri, Y.
    Isfahan University of Technology and Bu-Ali Sina University, Iran.
    The effect of Nb on texture evolutions of the ultrafine-grained dual-phase steels fabricated by cold rolling and intercritical annealing2017Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 694, s. 1026-1035Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Dual phase (DP) steels with different amounts of Nb were produced by utilizing cold rolling and intercritical annealing of a ferrite-martensite duplex starting structure. The effects of Nb contents (0.00, 0.06, 0.12 and 0.18 wt%) on microstructure and texture evolutions were studied. Addition of Nb promoted formation of ultra-fine grained structures with the ferrite grain size of about ~1 mm and uniformlydispersed martensite particles. The results showed increasing the fraction of the high angle grain boundaries and formation of {111} fiber components in the microstructures with increasing Nb content. In addition, the texture power was decreased with the addition of Nb, resulting in random texture components

  • 6.
    Jarfors, A. E. W.
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Butler, D. L.
    Nanyang Technological University, School of Mechanical and Aerospace Engineering, Singapore.
    Goi, K. L. S.
    Nanyang Technological University, School of Mechanical and Aerospace Engineering, Singapore.
    Microstructure formation of porous sintered Ti-Si-Zr compacts with mechanically alloyed-activated Ti-Si and TiH2 powders2014Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 594, s. 202-210Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Metallic implants are widely used in applications associated with bone. A major drawback of using metals is their elastic modulus which is higher than that of bone resulting in stress shielding and premature failure of the implant. The employment of biomaterials with a porous structure has the potential to lower the modulus and promote osseointegration. The present work investigates the microstructure formation and the resulting elastic modulus of a new Ti-Si-Zr alloy. The sintering procedure involves the use of both mechanically alloyed Ti-Si powder and TiH2 to activate sintering with the TiH2 also serving as a pore precursor. The procedure is designed to promote bonding but not consolidation. The influence of sintering temperature, heating rate, as well as the amount and size of the TiH2 on the phases formed and porosity was investigated. It was observed that the use of TiH2 increased the degree of porosity whilst the size of TiH2 particles could be used to control the pore size. The results showed that when using small TiH2 particles, the elastic modulus was strongly dependent on the fraction of TiH2. When large TiH2 particles were used, the porosity had no significant influence on the elastic modulus. The variation in behavior could be attributed to differences in microstructure. To control the bulk modulus it is essential to understand the differences in the microstructure formation mechanisms between these two cases. (C) 2014 Elsevier B.V. All rights reserved.

  • 7.
    Kermanpur, A.
    et al.
    Department of Materials Engineering, Isfahan University of Technology.
    Ghassemali, Ehsan
    tment of Materials Engineering, Isfahan University of Technology.
    Salemizadeh, S.
    tment of Materials Engineering, Isfahan University of Technology.
    Synthesis and characterisation of microporous titania membranes by dip-coating of anodised alumina substrates using sol–gel method2008Ingår i: Journal of Alloys and Compounds, ISSN 0925-8388, E-ISSN 1873-4669, Vol. 461, nr 1-2, s. 331-335Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The aim of this work was to synthesis microporous titania membranes by dip-coating of symmetric mesoporous anodised alumina substrates using sol–gel method. A stable titania sol containing nanoparticles was first prepared by establishing the proper values of the acid/alkoxide and the water/alkoxide molar ratios and pH. The titania sol was then utilised to dip-coat the anodised alumina substrates. The effects of dipping time, withdrawal rate, and sintering temperature were studied for both single- and double-layer coated samples. The thickness, structure and phase analysis of the coated membranes were characterised using thermogravimetric analysis, scanning electron microscopy and X-ray diffraction. The process conditions to achieve uniform, microporous titania coatings on the mesoporous alumina substrates were proposed.

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