• eutectic al–si–cu–fe–mn alloys with enhanced mechanical properties at room and elevated temperature

    نویسندگان :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 790
    • تعداد پرسش و پاسخ ها: 0
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     in this paper, we report a novel kind of eutectic al–si–cu–fe–mn alloy with ultimate tensile strength up to 336 mpa and 144.3 mpa at room temperature and 300 °c, respectively. this kind of alloy was prepared by metal mold casting followed by t6 treatment. the microstructure is composed of eutectic and primary si, α-fe, al2cu and α-al phases. iron-rich phases, which were identified as bcc type of α-fe (al15(fe,mn)3si2), exist in blocky and dendrite forms. tiny blocky al2cu crystals disperse in α-fe dendrites or at the grain boundaries of α-al. during t6 treatment, cu atoms aggregate from the super-saturation solid solution to form gp zones, θ′ or θ′. further analysis found that the enhanced mechanical properties of the experimental alloy are mainly attributed to the formation of α-fe and copper-rich phases.

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