Mg-2.54Nd-0.26Zn-0.32Zr合金组织分析

Microstructure Analysis of Mg-2.54Nd-0.26Zn-0.32Zr Alloy

摘要:

采用XRD、DTA、OM和TEM研究Mg-2.54Nd-0.26Zn-0.32Zr合金铸态和热处理后的相组成、相变温度、微观组织。研究表明：Mg-2.54Nd-0.26Zn-0.32Zr合金铸态组织析出相主要是分布在晶界的块状Mg12Nd稀土化合物，只有少量的片状和粒状Mg12Nd相分布在晶界和晶内；T6处理后Mg12Nd以相互交叉的片状形式团簇状分布在基体中，形成方式为点状析出相聚集而成

关键词:Mg-2.54Nd-0.26Zn-0.32Zr合金;组织分析;α-Mg;Mg12Nd

Abstract:

The microstructures of both as-cast and heat treated Mg-2.54Nd-0.26Zn-0.32Zr alloy were investigated by means of XRD, DTA, OM and TEM in this study. The results show that the massive Mg-RE phase Mg12Nd is mainly distributed on the grain boundary of as-cast Mg-2.54Nd-0.26Zn-0.32Zr. Only a small amount of flaky and grainy Mg12Nd distribute in the intracrystalline and grain boundary. The Mg12Nd phase is uniformly distributed on the matrix as crossed plate gathered by spotted state phase after solution and aging treatment.

Key words:Mg-2.54Nd-0.26Zn-0.32Zr alloy; microstructure analysis; α-Mg; Mg12Nd