Improving mechanical properties of age-hardenable Mg–6Zn–4Al–1Sn alloy processed by double-aging treatment  

作　　者：Shaozhen Zhu Tianjiao Luo Yuansheng Yang 

机构地区：[1]Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China [2]School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China [3]Shandong Key Laboratory for High Strength Lightweight Metallic Materials, Jinan 250014, China

出　　处：《Journal of Materials Science & Technology》2017年第11期1249-1254,共6页材料科学技术（英文版）

基　　金：supported by the National Basic Research Program of China (No. 2013CB632205);the National Key Research and Development Program of China (No. 2016YFB301105)

摘　　要：Microstructure and mechanical properties of a new high-strength Mg–6 Zn–4 Al–1 Sn alloy were investigated. Microstructure of the as-cast Mg alloy exhibited partially divorced characteristics. The dendritic structure of the Mg–6 Zn–4 Al alloy was significantly refined with the addition of 1%（in weight） Sn, but Mg2 Sn phases were not formed. In addition, an icosahedral quasi-crystal phase was formed in the as-cast Mg–6 Zn–4 Al–1 Sn alloy. It was found that after the double-aging treatment through two different heat treatments on the Mg–6 Zn–4 Al–1 Sn alloy, the precipitates were finer and far more densely dispersed in the matrix compared with single-aged counterpart, resulting in a significant improvement in tensile strength with yield strength, ultimate tensile strength and elongation of 175 MPa, 335 MPa and 11%,respectively.Microstructure and mechanical properties of a new high-strength Mg–6 Zn–4 Al–1 Sn alloy were investigated. Microstructure of the as-cast Mg alloy exhibited partially divorced characteristics. The dendritic structure of the Mg–6 Zn–4 Al alloy was significantly refined with the addition of 1%（in weight） Sn, but Mg2 Sn phases were not formed. In addition, an icosahedral quasi-crystal phase was formed in the as-cast Mg–6 Zn–4 Al–1 Sn alloy. It was found that after the double-aging treatment through two different heat treatments on the Mg–6 Zn–4 Al–1 Sn alloy, the precipitates were finer and far more densely dispersed in the matrix compared with single-aged counterpart, resulting in a significant improvement in tensile strength with yield strength, ultimate tensile strength and elongation of 175 MPa, 335 MPa and 11%,respectively.

关 键 词：Magnesium alloy Mg–Zn–Al–Sn Double-aging treatment Mechanical properties 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG156.92[金属学及工艺—金属材料]