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  • 1.
    Bogdanoff, Toni
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Seifeddine, Salem
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Dahle, Arne K.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    The effect of SI content on microstructure and mechanical properties of Al-Si alloy2016Inngår i: La Metallurgia Italiana, ISSN 0026-0843, Vol. 108, nr 6Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Al-Si alloys are the most popular casting alloys due to their excellent castability combined with high strengthto-weight ratio. This paper investigates the role of Si content in the range of 6.5 wt. % to 14.4 wt. % on the microstructure and mechanical properties of Al-Si-Mg casting alloys. All alloys were modified with 90-150 ppm Sr. No grain refiner was added. The samples were produced by directional solidification providing a microstructure that corresponds to microstructures found in die castings. From the phase diagram and coupled zone, increasing the Si level up to 14.4 wt. % is expected to start a competition between formation of α- dendrites and a fully eutectic microstructure. However, it is known that Sr-modification shifts the eutectic to higher Si contents. For the lower Si contents, the microstructure of the samples consisted of α-dendrites and a modified Al-Si eutectic. At 12.4 wt. % Si and above, a cellular eutectic microstructure was observed. No primary Si was observed even at 14.4 wt. % Si. The mechanical properties in terms of yield and tensile strength did not vary remarkably as a function of the Si level unlike the elongation to failure that dropped from 12 % at 6.5 wt. % Si to nearly 6 % at 14.4 wt. % Si; but still the material is exhibiting an elongation to failure that is far higher than normally expected.

  • 2.
    Ceschini, Lorella
    et al.
    University of Bologna, Italy.
    Morri, Alessandro
    University of Bologna, Italy.
    Toschi, Stefania
    University of Bologna, Italy.
    Boromei, Iuri
    University of Bologna, Italy.
    Bjurenstedt, Anton
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning. Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Seifeddine, Salem
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning. Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Al-Si-Cu alloys for high pressure die casting: Influence of Fe, Mn, and Cr on room temperaturemechanical properties2016Inngår i: La Metallurgia Italiana, ISSN 0026-0843, nr 6, s. 77-80Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Al-Si-Cu alloys with high Fe content are widely employed in high pressure die casting (HPDC). Even if Feis usually considered an impurity in secondary aluminum alloys, leading to the formation of harmfulintermetallic compounds, it helps in mitigating or eliminating the problem of die soldering. As a result,secondary Al alloys with Fe content of about 1 wt% are commonly employed for the production of HPDCcastings. Aiming to change the morphology of harmful Fe-bearing phases towards less detrimentalmorphologies, proper alloying elements may be added to the alloys. Mn and Cr (both present in thealuminum scrap), as instance, are reported to prevent from the formation of the acicular β-Al5FeSi phase,leading to the formation of more compact and polygonal intermetallics. Such phases are usually referredto as “sludge” particles. The influence of sludge particles on mechanical properties of Al -Si-Cu castings isstill under investigation. The present work aims at evaluating the effect of impurities (Fe, Mn and Cr)typically present in secondary Al alloys on the microstructure and mechanical properties of the A380 (Al -Si-Cu) alloy. Samples with different Fe, Mn and Cr content were produced and processed through adirectional solidification equipment to obtain specimens with controlled SDAS (~10 μm). Hardness androtating bending fatigue tests were carried out at room temperature. Mechanical properties of the alloyswere then related to the microstructure, analyzed by optical and scanning electron microscopy.

  • 3.
    Payandeh, Mostafa
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Jarfors, Anders E.W.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Wessén, Magnus
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning. RheoMetal.
    The effect of microstructural inhomogeneity on thermal diffusivity in a rheocast component2016Inngår i: La Metallurgia Italiana, ISSN 0026-0843, Vol. 108, nr 6, s. 57-60Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The relationship between microstructural characteristics and thermal diffusivity of a rheocast component was investigated for two Al-Si-Mg-Fe alloys with low Si contents. The microstructural investigation of the components clearly depicted the formation of coarse solute-lean globular α1-Al particles during the slurry fabrication process and fine solute-rich α2-Al and α3-Al particles during the secondary solidification in the die cavity. The microstructural characterization was quantified based on the amount of α1-Al particles in different locations of the component. The result clearly revealed a presence of both longitudinal and transverse macrosegregation of solute-lean α1-Al particles in the rheocast component. The study of thermal diffusivity and hardness revealed that the regions of the component with a high fraction of α1-Al particles had a higher thermal diffusivity but a lower hardness. Silicon in the solid solution was observed to be a critical factor in reducing the thermal diffusivity. The comparison between the effect of longitudinal and transverse segregation on thermal diffusivity showed that the transverse segregation had a stronger impact.

  • 4.
    Riestra, Martin
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Seifeddine, Salem
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Sjölander, Emma
    Scania CV AB, Södertälje.
    Tailoring Al-7Si-0.3Mg cast alloy properties to represent HPDC tensile and fatigue behaviour in component prototypes2016Inngår i: La Metallurgia Italiana, ISSN 0026-0843, Vol. 108, nr 6, s. 33-36Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    To produce prototypes with mechanical properties expectable from EN AC 46000 HPDC components, prototyping related processes such as sand and plaster gravity casting as well as proper alloying and post solidification processes need to be understood and adjusted. Therefore, the influence of process, composition and heat treatment on tensile and fatigue behaviour has been investigated for an EN AC 42100 alloy. Sand cast test samples comprised the base alloy in as-cast condition and T5 treated as well as a 2 wt. % Cu addition in as-cast condition. Plaster cast test samples consisted of the base alloy in ascast condition and T6 treated as well as a 1.7 wt. % Cu addition in as-cast condition. Tensile and fully reversed bending fatigue tests (R=-1) have been performed and the results have been compared to EN AC 46000 HPDC values. Samples in heat treated conditions and with Cu addition exhibited superior tensile properties than the base alloy in as-cast state for both casting processes. Yield strength and elongation values for the sand cast T5 treated and with Cu addition samples were similar to the HPDC ones. In terms of fatigue behaviour, T6 treated and with Cu addition samples exhibited strength improvements for plaster cast samples, while no changes were observed for sand cast samples. Only sand cast samples exhibited similar fatigue behaviour to the HPDC samples. The sand cast T5 treated samples were found to produce the most similar overall mechanical behaviour to EN AC 46000 HPDC.

  • 5.
    Sjölander, Emma
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Seifeddine, Salem
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    The influence of natural ageing on the artificial ageing response of Al-Si-Cu-Mg casting alloys2012Inngår i: La Metallurgia Italiana, ISSN 0026-0843, Vol. 11-12, s. 39-43Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The T6 heat treatment is commonly used to increase the strength of gravity cast Al-Si components containing Cu and/or Mg. The artificial ageing response is known to be affected by the thermal history, such as solution treatment, quench rate, natural ageing and heating rate to the artificial ageing temperature. The influence of natural ageing on the artificial ageing response was investigated for three alloys; Al-8Si-0.4Mg, Al-7Si-3Cu and Al-8Si-3Cu-0.4Mg. Natural ageing had a strong influence on the ageing response of the Al-Si-Mg alloy in the underaged condition and the strength increase was strongly reduced. Despite this, the time to peak yield strength as well as its magnitude were not strongly affected by natural ageing. No clear influence of natural ageing was observed for the Al-Si-Cu alloy. For the Al-Si-Cu-Mg alloy the ageing response seems to depend on the natural ageing time. Natural ageing of 3 weeks shifted the peak yield strength to shorter ageing times and its magnitude was decreased a little compared to direct ageing after quench. Natural ageing of 1 day gave the least beneficial properties after artificial ageing.

  • 6.
    Zamani, Mohammadreza
    et al.
    Högskolan i Jönköping, Tekniska Högskolan, JTH, Material och tillverkning.
    Seifeddine, Salem
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Ghassemali, Ehsan
    Högskolan i Jönköping, Tekniska Högskolan, JTH. Forskningsmiljö Material och tillverkning – Gjutning.
    Effect of cooling rate and eutectic modification on texture and grain structure of Al-Si-Cu-Mg die cast alloy2016Inngår i: La Metallurgia Italiana, ISSN 0026-0843, Vol. 108, nr 6, s. 5-8Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The effect of cooling rate and eutectic modification on texture evolution and grain structure of an Al-Si-Cu-Mg die cast alloy were investigated using optical microscopy (OM) and electron backscatter diffraction (EBSD) techniques. Directional solidification technique was utilized to produce as-cast specimens having low level of casting defects with controlled microstructural scale: specimens with average SDAS of 10 and 25 µm. Mode of solidification, cooling rate and eutectic modification did not induce any significant texture in the microstructure. An increase in cooling rate resulted in reduction grain size. High degree of grains orientation randomness was found in high cooling rate regardless of modification treatment.

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