کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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831228 | 1470365 | 2011 | 5 صفحه PDF | دانلود رایگان |
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.
► We observed the globular β′ precipitates in Mg–8Gd–4Y–Nd–Zr alloy.
► We investigated the effect of globular precipitates on mechanical properties of Mg–8Gd–4Y–Nd–Zr alloy.
► Pre-aged at 150 °C can improve the strength of the alloy.
Journal: Materials & Design - Volume 32, Issue 10, December 2011, Pages 4994–4998