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.
作者
管凯
张景怀
杨强
李柏顺
巫瑞智
孟健
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)
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)。
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
Mg-Sm-Gd alloy
Ca
microstructure characterization
mechanical properties
transmission electron microscopy(TEM)
