• effects of yttrium and heat treatment on the microstructure and tensile properties of al–7.5si–0.5mg alloy

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 503
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     the effects of yttrium (y) additions (0, 0.1, and 0.3 wt.%) and t6 heat treatment on the microstructure and tensile properties of al–7.5si–0.5mg alloy have been investigated in the present work. the microstructures and fracture surfaces of as-cast and heat treated samples were examined by scanning electron microscopy (sem). it was found that y modified the eutectic silicon from a coarse plate-like and acicular structure to a fine branched and some fibrous one with a better uniform distribution. in addition, t6 heat treatment played a crucial role in the fragmentation and spheroidization of eutectic silicon, especially in the well modified alloys. the tensile properties were improved by the addition of y followed by the t6 heat treatment, and a good combination of ultimate tensile strength (353 mpa), yield strength (287 mpa) and elongation (12.1%) was obtained when the y addition was 0.3 wt.%. furthermore, fractographic examinations revealed that dimple-like mechanism was responsible for ductile fracture.

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