Abstract
The quench sensitivity of a long period stacking ordered (LPSO) phase containing Mg alloy, Mg–12Gd–0.8Zn–0.4Zr (GZ1208K) (wt%), was characterized under the water cooling (WC) and air cooling (AC) conditions. GZ1208K alloy indicates significant quench sensitivity, that is, the yield strength (YS) of GZ1208K-WC alloy is 25.2% and 21.6% higher than GZ1208K-AC alloy, when aged at 225 °C for 8 h and 32 h. The significant quench sensitivity is due to the formation the long basal precipitates during cooling in the air, which probable are a mixture of basal γ′ precipitate and the LPSO phases, and called as fine-LPSO precipitates at the present study. The strengthening effect of solution atom, fine-LPSO precipitate and prismatic precipitate in GZ1208K alloy can be listed in following order: prismatic precipitate >> fine-LPSO precipitate > solution atom. Their influence on the ductility was also discussed.
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