高性能铸造稀土镁合金的发展

从合金体系和纯净化工艺两个方面对高性能铸造稀土镁合金进行了综述。按时间顺序,对Mg-Nd、Mg-Y和Mg-Gd三个系列合金的研究现状进行论述,重点针对Mg-Gd系合金,着重介绍了其发展历史、力学性能、强化机制。通过纯净化前后的对比可以看出,纯净化可以有效地降低合金中的缺陷,提高合金的力学性能。最后分析讨论了高性能铸造稀土镁合金研究中存在的问题以及今后发展的主要方向。

High Performance Cast Magnesium Rare-earth Alloys:Retrospect and Prospect

The alloy systems and purification process of high performance cast magnesium rare-earth alloys are reviewed.In chronological order,the Mg-Nd,Mg-Y and Mg-Gd alloy systems are reviewed,including the history, mechanical properties and strengthening mechanism.The review focus on the Mg-Gd alloy system.And then,the mi-crostructures of the alloys before and after purification are compared,indicating that purification process can reduce defects and enhance mechanical properties of the cast magnesium rare-earth alloy.At last,the problems and develop-ment prospect of high performance cast magnesium rare-earth alloys are discussed.