Abstract The microstructure and aging precipitates of a new cast Mg-Y-Sm-Zn-Zr alloy were investigated. The results showed that eutectic phase forming in solidification process was proved to be (Mg,Zn)3(Y,Sm). The alloy exhibited high hardness (maximum value of 148 HV), which is higher in comparison with other high rare-earth Mg alloy. The aging precipitate β′ is thermally stable at 200 °C for the crystal structure of β′ kept unchanged in the whole aging process.

中文翻译：

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一种新型铸造高硬度Mg-Y-Sm-Zn-Zr合金

摘要 研究了一种新型铸造Mg-Y-Sm-Zn-Zr合金的组织和时效析出物。结果表明,凝固过程中形成的共晶相为(Mg,Zn)3(Y,Sm)。该合金表现出高硬度（最大值为 148 HV），与其他高稀土镁合金相比更高。由于β′的晶体结构在整个时效过程中保持不变，时效析出物β′在200℃时热稳定。