铸造Mg-5Sm-4Gd合金的反常抗拉强度  

Abnormal Tensile Strength of Cast Mg-5Sm-4Gd Alloy

作　　者：李萍[1] 黄蕾[1] 王莹[1] 张清[2] LI Ping;HUANG Lei;WANG Ying;ZHANG Qing(School of Civil Engineering,Luoyang Institute of Science and Technology,Luoyang 471023,Henan,China;School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,Henan,China)

机构地区：[1]洛阳理工学院土木工程学院,河南洛阳471023 [2]河南科技大学材料科学与工程学院,河南洛阳471023

出　　处：《铸造》2024年第12期1694-1698,共5页Foundry

基　　金：河南省科技攻关计划项目(222102230112)。

摘　　要：通过电子拉伸试验,结合显微组织、稀土相和拉伸断口分析,研究了铸造Mg-5Sm-4Gd合金的室温和高温抗拉强度。结果表明:随着温度的升高,Mg-5Sm-4Gd合金的抗拉强度先升高后降低,出现了反常温度效应。该合金主要由α-Mg基体以及稀土相Mg41Sm5和Mg5Gd组成,平均晶粒尺寸约为200μm。拉伸断裂方式主要为脆性断裂。抗拉强度反常温度效应与合金的晶粒尺寸、α-Mg基体的晶格常数及稀土相的热稳定性有关。The room and high temperature tensile strengths of cast Mg-5Sm-4Gd alloy were studied by electronic tensile tests,and microstructure,rare earth phase and tensile fracture analysis.The results showed that the tensile strength of Mg-5Sm-4Gd alloy increased first and then decreased with increasing temperature,and had an abnormal temperature effect.The microstructure was mainly composed ofα-Mg matrix and rare earth phases Mg41Sm5 and Mg5Gd,and the average grain size was about 200μm.The tensile fracture mode was mainly brittle fracture at room and high temperature.The abnormal temperature effect of tensile strength should be related to grain size of the alloy,the lattice constant ofα-Mg matrix and the thermal stability of rare earth phases.

关 键 词：Mg-5Sm-4Gd合金 抗拉强度 反常温度效应 稀土相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]