• formation of globular structure in a357 aluminum alloy via a near-liquidus casting (nlc) route

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1396/07/11
    • تاریخ انتشار در تی پی بین: 1396/07/11
    • تعداد بازدید: 322
    • تعداد پرسش و پاسخ ها: 0
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    a near-liquidus casting (nlc) route is applied to prepare a357 aluminum alloy with a globular structure. the method is cost-effective and based on the melt pouring with low superheat level followed by isothermal re-heating treatment in the semi-solid region. this study describes the effect of both casting temperature and re-heating time on the evolution of globular structure in a357 al alloy. to do so, molten alloy is poured directly into a cylindrical mold at various temperatures of 625°c, 635°c, 645°c and 655°c. then, the specimens are re-heated at 590°c for different time of 10, 20, 30 and 40 min. the microstructural development of specimens after reheating stage is investigated. the primary α-al dendritic phase in the conventional cast alloy is transformed into globular shape in nlc-processed specimens only after re-heating treatment. increasing both casting temperature and re-heating time change the size and shape factor of globules. the results show that the optimum combination of pouring temperature and re-heating time is found to be 625°c and 30 min, respectively. the mechanisms behind the microstructural evolution are proposed.

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