微量Ca添加对铸造Mg-Sm-Gd基合金显微组织与力学性能的影响  

Effects of trace Ca addition on microstructure and mechanical properties of as-cast Mg-Sm-Gd-based alloy

作　　者：管凯 张景怀 杨强[2] 李柏顺 巫瑞智 孟健[2] Kai GUAN;Jing-huai ZHANG;Qiang YANG;Bai-shun LI;Rui-zhi WU;Jian MENG(Key Laboratory of Superlight Material and Surface Technology,Ministry of Education,College of Material Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China;State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;School of Mechanical and Automotive Engineering,Changchun Institute of Technology,Changchun 130012,China)

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院超轻材料与表面技术教育部重点实验室,哈尔滨150001 [2]中国科学院长春应用化学研究所稀土资源利用国家重点实验室,长春130022 [3]长春工程学院机械与汽车工程学院,长春130012

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第1期46-58,共13页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.52071093,51871069);the Fundamental Research Funds for the Central Universities,China(No.3072021CF1008);the Open Funds of the State Key Laboratory of Rare Earth Resource Utilization,China(No.RERU2020012)。

摘　　要：主要通过透射电子显微镜、高角度环形暗场扫描透射电子显微镜和拉伸测试研究微量Ca元素对Mg-Sm-Gd-Zn-Zr合金显微组织和力学性能的影响。结果表明,Mg-Sm-Gd-Zn-Zr合金中主要第二相为Zn元素富集的Mg_(3)RE相,Ca元素添加不仅可以细化晶粒,还可以促进Mg_(5)RE相和溶质原子富集的层错形成。此外,共格界面表明Mg_(3)RE相可以作为Mg_(5)RE相的形核位点,这些均有利于合金力学性能的提高。The effects of trace amounts of Ca on the microstructure and mechanical properties of as-cast Mg-SmGd-Zn-Zr alloy were systematically investigated mainly by means of transmission electron microscopy(TEM),high-angle annular dark-field scanning transmission electron microscopy(HAADF-STEM)and tensile test.The results reveal that the dominant intermetallic compound in Mg-Sm-Gd-Zn-Zr alloy is Mg_(3)RE phase with significant enrichment of Zn.The addition of Ca in Mg-Sm-Gd-Zn-Zr alloy can not only refine grains,but also promote the formation of Mg_(5)RE phase and solute-enriched stacking faults(SESFs).The coherent interface indicates that Mg_(3)RE phase can act as the nucleation site of Mg_(5)RE phase.Finally,the decreased grain size and the formation of Mg_(5)RE phase and SESFs in the Ca-modified alloy are beneficial to the enhancement of mechanical properties.

关 键 词：Mg-Sm-Gd合金 CA 显微组织表征 力学性能 透射电子显微术 

分 类 号：TG146.22[一般工业技术—材料科学与工程]