Microstructure evolution during heat treatment and mechanical properties of Mg–2.49Nd–1.82Gd–0.19Zn–0.4Zr cast alloy
作者： S.J. Liu , G.Y. Yang , S.F. Luo , W.Q. Jie
DOI: 10.1016/J.MATCHAR.2015.07.034
关键词:
摘要: Abstract Microstructure evolution during heat treatment and mechanical properties of Mg–2.49Nd–1.82Gd–0.19Zn–0.4Zr cast alloy were investigated experimentally in different stages process. As-cast was found to be consisting dendritic α(Mg) grains, interdendritic α(Mg) + Mg12Nd eutectic. Within needle-like Mg12Nd phase, quadrate-like Mg5Gd phase α(Zr) particles also observed. After a solution at 515 °C for 18 h, eutectic almost dissolved into grain, but new Zn2Zr3 observed within grains along grain boundaries. an aged 205 °C more dispersed precipitates, coarsened rod-shaped metastable precipitates β″(Mg3Nd) β′(Mg7Nd) grains. The ultimate tensile strength the yield experimental after measured 287 MPa 206 MPa room temperature, 240 MPa 175 MPa 200 °C, 220 MPa 165 MPa 250 °C, respectively. improved discussed based on microstructure evolution.
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