• effects of thermal treatment on precipitate shape and mechanical properties of mg–8gd–4y–nd–zr alloy

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1390/01/01
    • تاریخ انتشار در تی پی بین: 1390/01/01
    • تعداد بازدید: 443
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     precipitation reactions in a mg–8gd–4y–nd–zr alloy have been investigated using tem, hrem, hardness measurements and tensile testing. globular β′ precipitates, which were different from the typical plate-shaped β′ precipitates usually observed in mg–gd-based alloys, were detected in the 160 °c/192 h-aged sample. instead of dissolution and then precipitating as plate-shaped β′ precipitates, the formed globular β′ precipitates grew up when further aged at 215 °c, which resulted in the decrease in strength comparing with that of the 215 °c single-stage aged samples. two-stage ageing treatments on the alloy demonstrated that ageing 192 h at 150 °c plus 16 h at 215 °c made the ultimate strength and the yield strength improved 17 mpa and 13 mpa, respectively.

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