材料工程2017，Vol.45Issue(9)：116-122,7.DOI:10.11868/j.issn.1001-4381.2015.000649
Zn对铸态Mg-Y-Nd-Zr合金组织和力学性能的影响
Effects of Zn on Microstructure and MechanicalProperties of As-cast Mg-Y-Nd-Zr Alloys
摘要
Abstract
Effects of Zn on microstructure and mechanical properties of Mg-Y-Nd-Zr as-cast alloys were investigated by the optical microscopy(OM), scanning electron microscopy(SEM), X-ray diffractometry(XRD) and the mechanical properties test.The results show that the grain size of Mg-Y-Nd-Zr-xZn(x=0.0%, 0.5%, 1.0%, 1.5%,mass fraction)alloys is greatly refined with the increase of Zn content, which is refined from (57±0.8)μm to (30±0.3)μm.The volume fraction of eutectic structure at grain boundary increases gradually.Mg12Nd phase and Mg24Y5 phase exist mainly in Mg-Y-Nd-Zr as-cast alloy.With the addition of 0.5%Zn, Mg12YZn phase appears at the grain boundary.With the increase of Zn, the volume fraction of Mg12YZn phase and the mechanical properties of the alloys increases gradually.The alloy containing 1.0%Zn exhibits the optimal mechanical properties, the ultimate tensile strength, yield strength and elongation are (208±5.9), (159±3.9)MPa and (7.5±0.2)%, respectively;comparing with the alloy without the addition of Zn, the ultimate tensile strength, yield strength and elongation increase by 18, 42MPa and 1.2%.关键词
Mg-Y-Nd-Zr合金/Zn/显微组织/力学性能Key words
Mg-Y-Nd-Zr alloy/Zn/microstructure/mechanical property分类
矿业与冶金引用本文复制引用
苏再军,杨树忠,刘楚明,杨新华,刘先兰..Zn对铸态Mg-Y-Nd-Zr合金组织和力学性能的影响[J].材料工程,2017,45(9):116-122,7.基金项目
国家973计划资助项目(2013CB632200) （2013CB632200）
湖南省教育厅优秀青年项目资助(17B069) （17B069）
湖南省科技计划资助项目(2015JC3106) （2015JC3106）
