La-Ce混合稀土对AZ91D合金组织和性能的影响  

Effect of La-Ce mischmetal on microstructure and properties of AZ91D alloy

作　　者：陈利超 苏植成 任井涛 方立强 汪子超 王宇宇 赵莉萍[2] Chen Lichao;Su Zhicheng;Ren Jingtao;Fang Liqiang;Wang Zichao;Wang Yuyu;Zhao Liping(Linfeng Special Casting Co.,Ltd.,Inner Mongolia First Machinery Group,Baotou Inner Mongolia 014030,China;School of Materials and Metallurgy,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China)

机构地区：[1]内蒙古一机集团林峰特种铸造有限公司,内蒙古包头014030 [2]内蒙古科技大学材料与冶金学院,内蒙古包头014030

出　　处：《金属热处理》2021年第12期130-134,共5页Heat Treatment of Metals

摘　　要：以AZ91D镁合金作为研究对象,探究了La-Ce混合稀土含量对其组织性能的影响。结果表明:在AZ91D镁合金中加入混合稀土La-Ce后,铸态组织为网状β-Mg_(17)Al_(12)相及少量杆状稀土化合物。且随着稀土含量增多,β-Mg_(17)Al_(12)和杆状稀土化合物被细化。经固溶时效处理后,随稀土含量增加,试验合金伸长率增大,硬度和抗拉强度均先增后降,稀土含量为2.38%时,合金力学性能最佳。Taking AZ91 D magnesium alloy as the research object, the effect of La-Ce mischmetal content on microstructure and properties was investigated. The results show that with the adding of La-Ce mischmetal, the as-cast microstructure is network β-Mg_(17)Al_(12) phase and a few rod-shaped rare earth compounds. With the increase of rare earth content, the β-Mg_(17)Al_(12) and rod-shaped rare earth compounds are refined. After solid solution and aging, with the increase of rare earth content, the elongation of the tested alloy increases, the hardness and tensile strength first increase and then decrease. When the La-Ce mischmetal content is 2.38%, the mechanical properties of the alloy are the best.

关 键 词：镁合金AZ91D La-Ce混合稀土 组织 力学性能 

分 类 号：TG164.2[金属学及工艺—热处理]