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齐福刚,罗文忠,吴传平,赵镍,叶芝松,侯彩红,张丁非.ZM81-xSn (x = 0, 2, 4, 6, 8 and 10)变形镁合金的组织演变和力学性能[J].稀有金属材料与工程(英文),2020,49(3):778~786.[Qi Fugang,Luo Wenzhong,Wu Chuanping,Zhao Nie,Ye Zhisong,Hou Caihong and Zhang Dingfei.Microstructure evolution and mechanical properties of ZM81-xSn (x = 0, 2, 4, 6, 8 and 10) wrought magnesium alloys[J].Rare Metal Materials and Engineering,2020,49(3):778~786.]
Microstructure evolution and mechanical properties of ZM81-xSn (x = 0, 2, 4, 6, 8 and 10) wrought magnesium alloys
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Received:October 15, 2018  Revised:December 18, 2018
DOI:
Key words: ZM81 alloy  Sn  Precipitate  Mechanical properties
Foundation item:国家自然科学基金青年科学基金项目(51701172);湖南省自然科学基金青年基金项目(2018JJ3504);中国博士后科学基金资助项目(2018M632977);输变电设备防灾减灾国家重点实验室开放基金项目(2016ZKFW127)
Author NameAffiliation
Qi Fugang,Luo Wenzhong,Wu Chuanping,Zhao Nie,Ye Zhisong,Hou Caihong and Zhang Dingfei  
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Abstract:
      The microstructure and mechanical properties of the ZM81 alloys with varying Sn contents subjected to the extrusion and T6 treatments were investigated by OM, XRD, SEM, TEM, hardness test and uniaxial tensile test at room temperature, respectively. The results show that after the addition of Sn element, an Mg2Sn eutectic phase is formed, which can refine the as-cast microstructure. Sn element has an obvious effect on refining the microstructure of as-extruded alloys by restricting the occurrence of dynamic recrystallization and restraining the grain growth during extrusion, and improves the mechanical properties. T6 treatments, especially double aging, can significantly increase the strengths of the extruded alloys. Among them, the ZM81-4Sn alloy with double aging exhibits an ultimate tensile strength of 416MPa, a 0.2% yield strength of 393MPa and an elongation of 4.1%. The microstructure characterization suggests that the high strengths of the peak-aged alloys are attributed to the combined precipitation strengthening of the fine and dispersed MgZn2 and Mg2Sn precipitates, and the pre-cipitates after double peak aging are finer than those after single peak aging.