研究了Mg-10Gd-6Y-0.4Zr合金在225℃和250℃时效过程的沉淀相变化以及合金的高温力学性能.结果表明:Mg-10Gd-6Y-0.4Zr合金在225℃和250℃都有明显的时效硬化行为,而在225℃时效的硬化效果要强于250℃时效.Mg-10Gd-6Y-0.4Zr合金在225℃和250℃时效全过程中,固溶体分解的序列是由β”相转变为β′相,没有观察到其它沉淀相的析出.β″相比β′相具有更强的硬化作用,析出的β′相具有良好的热稳定,是合金高温性能优异的主要原因.
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