稀土元素对耐热镁合金显微组织及力学性能的影响  

Effects of rare earth elements on microstructures and mechanical properties of heat-resistant magnesium alloys

作　　者：孟利[1] 刘凯华 邓姜哲 郭松阳 张波[1] 孙铭璇 MENG Li;LIU Kaihua;DENG Jiangzhe;GUO Songyang;ZHANG Bo;SUN Mingxuan(Metallurgical Technology Institute,Central Iron and Steel Research Institute,Beijing 100081,China;School of Mechanical and Materials Engineering,North China University of Technology,Beijing 100144,China)

机构地区：[1]钢铁研究总院冶金工艺研究所,北京100081 [2]北方工业大学机械与材料工程学院,北京100144

出　　处：《中国体视学与图像分析》2021年第4期407-412,共6页Chinese Journal of Stereology and Image Analysis

基　　金：国家重点研发计划项目(2017YFB0903901)。

摘　　要：为了研究稀土元素对耐热镁合金显微组织及力学性能的影响,对比研究了两种添加稀土的Mg-Gd-Zr-MM和Mg-Y-Zr-MM合金热挤压态的显微组织和高温力学性能。结果表明,Y元素对合金的晶粒细化作用稍强,两种合金的平均晶粒尺寸分别为13.71μm和12.42μm;稀土元素在合金中大量以第二相粒子析出,其中Gd元素形成尺寸较大的球状第二相,Y元素形成尺寸较小的棒状第二相,Y元素形成的第二相分布较为均匀;含Y合金的室温硬度、不同温度的屈服强度、抗拉强度均优于含Gd合金。In order to study the effects of rare earth elements on the microstructure and mechanical properties of heat-resistant magnesium alloys,the microstructures and high-temperature mechanical properties of hot extruded composite rare earth(MM)bearing Mg-Gd-Zr-MM and Mg-Y-Zr-MM alloys were comparatively studied.The results show that Y element has a stronger effect on the grain refinement of the alloy and the average grain size of the two alloys is 13.71μm and 12.42μm,respectively.Rare earth elements mainly form second phase particles in the alloys,among which Gd element forms spherical second phase particles with larger size,Y element forms rod second phase particles with smaller size in rather uniform distribution.The room temperature hardness,yield strength and tensile strength at various temperatures of Y-containing alloy are better than those of Gd-containing alloy.

关 键 词：耐热镁合金 稀土元素 晶粒尺寸 第二相 抗拉强度 

分 类 号：TG146.22[一般工业技术—材料科学与工程]