Nd在挤压态AZ31镁合金中的行为及作用

来源期刊：中国有色金属学报2010年第6期

论文作者：李明照 王帅 王跃琪 李琮 许并社

文章页码：1039 - 1045

关键词：镁合金；AZ31合金；挤压；微观组织；力学性能

Key words：magnesium alloy; AZ31 alloys; extrusion; microstructure; mechanical properties

摘    要：通过金相显微镜、SEM和XRD观察研究挤压态 AZ31-xNd镁合金的微观组织和析出相，并测试合金的室温和高温力学性能。结果表明：Nd 在合金中以Al₂Nd和Mg₁₂Nd化合物形式存在，且随着Nd量的增加，其数量增加；Nd使合金的晶粒细化、室温和高温性能提高。加入0.6% Nd 的合金晶粒尺寸由未加 Nd时的26 μm降至约10 μm，加入0.6% Nd合金的室温抗拉强度、屈服强度和伸长率分别为 325 MPa、247 MPa和18.1%。含Nd合金的抗拉强度和屈服强度随温度升高而下降，而伸长率随温度的升高而增加。

Abstract: The microstructures and precipitated phases of as-extruded AZ31 magnesium alloy were studied by OM, SEM and XRD. The mechanical properties of the alloys at room temperature and high temperature were also tested. The results show that the addition of Nd results in the formation of Al₂Nd and Mg₁₂Ng phases in the matrix and the grain refinement in AZ31 alloy, and the amounts of Al₂Nd and Mg₁₂Nd phases increase with the increase of Nd addition. The mechanical properties at room temperature and high temperature are improved significantly due to the precipitation of second phases and grain refinement. The average grain size of alloy changes from 26 μm without Nd to 10 μm when added 0.6% Nd. The tensile strength, yield strength and elongation of as-extruded AZ31 alloy with 0.6% Nd are 325 MPa, 247 MPa and 18.1% at room temperature. The tensile strength and yield strength of alloy with Nd decrease, but the elongation increases with increasing temperature.

基金信息：山西省重点实验室开放基金资助项目
山西省回国留学人员科研资助项目