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伍华怡,张丁非,蒋璐瑶,冯靖凯,赵阳,潘复生.Zn添加对Mg-8Al-2Sn镁合金组织和性能的影响[J].稀有金属材料与工程(英文),2019,48(7):2091~2198.[Wu Huayi,Zhang Dingfei,Jiang Luyao,Feng Jingkai,Zhao Yang and Pan Fusheng.Effects of Zn Addition on the Microstructure and Mechanical Properties of Mg-8Al-2Sn Alloy[J].Rare Metal Materials and Engineering,2019,48(7):2091~2198.]
Effects of Zn Addition on the Microstructure and Mechanical Properties of Mg-8Al-2Sn Alloy
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Received:January 26, 2018  Revised:June 17, 2019
DOI:
Key words: magnesium alloys  Mg-Al-Sn-Zn alloy  extrusion  microstructure  mechanical properties
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目),国家重点基础研究发展计划(973计划),国家重点研发计划项目
Author NameAffiliation
Wu Huayi,Zhang Dingfei,Jiang Luyao,Feng Jingkai,Zhao Yang and Pan Fusheng  
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Abstract:
      The effect of adding 0-2.0 wt.% Zn to the Mg-8Al-2Sn alloy was investigated by analyzing the microstructures and tensile properties. The results revealed that the phase compositions of Mg-8Al-2Sn-xZn alloys are α-Mg, Mg17Al12 and Mg2Sn phases. The morphology of eutectic phases of the as-cast alloys was changed from normal eutectic to divorced eutectic with Zn addition. Grain sizes of the alloys were uniform after hot extrusion with Zn addition. Dynamic precipitation of the second phases was promoted by the addition of Zn during hot extrusion. The second phases coarsened in Mg-8Al-2Sn-2Zn alloy. Precipitates formed during the aging treatment and the amount of which increased with the addition of Zn content. Besides, the ultimate tensile and yield strength of the extruded and aged alloys gradually increased with the addition of Zn content. The results showed that Mg-8Al-2Sn-2Zn alloy has the best mechanical property that the ultimate tensile strength, yield strength and elongation of the as-aged alloy were 385 MPa, 291 MPa and 6.44%, respectively.