Gd对铸态AZ31合金组织和性能的影响  

Effects of Gd on Microstructure and Properties of As-cast AZ31 Magnesium Alloy

作　　者：谷松伟[1] 郝海[1] 张爱民[1] 宋迎德[1] 张兴国[1] 

机构地区：[1]大连理工大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2011年第5期472-475,391,共4页Special Casting & Nonferrous Alloys

基　　金：国家高技术研究发展计划(863计划)资助项目(2009AA03Z525);教育部新世纪优秀人才支持计划资助项目(NCET-08-0080);大连市科学技术基金项目(2009J21DW003)

摘　　要：研究了稀土元素Gd对铸态AZ31镁合金显微组织和力学性能的影响。结果表明,Gd的加入使AZ31合金中出现了颗粒状和块状的Al2Gd相,并使β-Mg17Al12相的含量减少,从而细化了AZ31铸态组织;0.8%的Gd的加入使合金的平均晶粒尺寸从约290μm减小到约140μm,合金的强度和伸长率分别提高到210MPa和18.3%。Effects of RE element Gd on microstructure and mechanical properties of as-cast AZ31 magnesium alloy were investigated.The results reveal that microstructure of the as-cast AZ31 magnesium alloy can be refined with Gd addition,resulting in the decrease of Mg17Al12 phase and occurrence of particle or polygonal Al2Gd phase.With 0.8% Gd addition,average grain size of the alloy is refined from approximately 290 μm to 140 μm,and tensile strength and elongation are improved to 210 MPa and by 18.3%,respectively.

关 键 词：AZ31 GD 晶粒细化 微观组织 

分 类 号：TG292[金属学及工艺—铸造]