对加Nd的AM50镁合金铸态试样进行固溶处理(420℃/12 h), 研究了Nd对其显微组织、力学性能和抗高温蠕变性能的影响. 结果表明:Nd的加入细化了晶粒, 导致AM50合金室温力学性能的提高.Nd在AM50合金中形成了Al$_{11}$Nd$_{3}$高温稳定相,Al$_{11}$Nd$_{3}$的存在使加Nd的AM50合金在200℃的稳态蠕变率及高温(150℃)力学性能大幅度提高.
Nd was added to AM50 magnesium alloys to study the microstructure, mechanical properties and creep resistance properties. The specimens were heated at 420℃ for 12 h followed by quenching, and the results show that addition of small amount of Nd to AM50 magnesium alloys resulted in the refinement of grain.The RT trengthening mechanism of alloys containing Nd was mainly from the fine grain strengthening. Nd in AM50 exists in the form of Al$_{11}$Nd$_{3}$ that is thermal stable phase. Due to the existing of Al$_{11}$Nd$_{3}$, the steady state creep rate decreased greatly at the temperature 200℃ and the elevated temperature mechanical property (150℃) were increased.
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