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Fluidity, Microstructure, and Tensile Properties of Sub-rapidly Solidified Mg-6Al-4Zn-xSn(x=0,0.6,1.2,1.8) Alloy

Fluidity, Microstructure, and Tensile Properties of Sub-rapidly Solidified Mg-6Al-4Zn-xSn(x=0,0.6,1.2,1.8) Alloy

作     者:Jie Cui Tianjiao Luo Yingju Li Xiaohui Feng Qiuyan Huang Yuansheng Yang Jie Cui;Tianjiao Luo;Yingju Li;Xiaohui Feng;Qiuyan Huang;Yuansheng Yang

作者机构:School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China School of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China 

出 版 物:《Acta Metallurgica Sinica(English Letters)》 (金属学报(英文版))

年 卷 期:2021年第34卷第9期

页      面:1265-1276页

核心收录:

学科分类:08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)] 

基  金:financially supported by the National Key Research and Development Program of China(No.2017YFB0103904) the Key Research and Development Project of Liaoning Province(No.2019JH2/10100008) the National Key Research and Development Program of China(No.2018YFE115800) the Key Research and Development Plan of Shandong Province(No.2019JZZY020329) 

主  题:Magnesium alloy Melt viscosity Grain size Shrinkage Tensile properties 

摘      要:In this paper, the infl uence of the Sn element on the melt viscosity, grain size, shrinkage, and tensile properties of the subrapidly solidified Mg-6Al-4Zn alloy was studied. The results showed that the melt viscosity of the Mg-6Al-4Zn alloy was greatly decreased because of the addition of Sn. As the content of Sn increased from 0 to 1.8 wt.%, the grain size of the alloy was refined, and the dendrite microstructure was changed to rose-shaped ones simultaneously. The decreased melt viscosity and refined microstructure were conductive to the feeding of melt, which contributed to the reduction in volume fraction of shrinkage. The volume fraction of shrinkage of the Mg-6Al-4Zn-1.2 Sn alloy was reduced by 30.8%, compared with that of the alloy without Sn addition. Tensile properties of the Mg-6Al-4Zn-x Sn alloys were increased firstly and then decreased with the augmented Sn content. The yield strength, ultimate tensile strength, and elongation of the alloy containing 1.2 wt.% Sn were 21.4%, 39.5%, and 259.0% higher than those of the alloy without Sn addition, respectively. The addition of Sn was considered to reduce the shrinkage of the sub-rapidly solidified Mg-6Al-4Zn magnesium alloy and thus improved its tensile properties. To identify the mechanism, the effect of Sn on the volume fraction of shrinkage was discussed from three aspects of melt viscosity, grain refinement, and volume fraction of eutectic phases.

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