Comparison about effects of minor Zr, Sr and Ca additions on microstructure and tensile properties of Mg-5Gd-1.2Mn-0.4Sc (wt%) magnesium alloy

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• 作者：Mingbo Yang^a ; ^b ; ^{yangmingbo@cqut.edu.cn} ; Hongliang Li^a ; Renju Cheng^c ; Fusheng Pan^b ; Hongjun Hu^a
• 关键词：Magnesium alloys ; Mg&ndash ; Gd&ndash ; Mn&ndash ; Sc alloys ; Zr ; Sr ; Ca
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：30 May, 2012
• 卷：545
• 期：Complete
• 页码：201-208
• 文件大小：2354 K

摘要

The effects of minor Zr, Sr and Ca additions on the microstructure and tensile properties of the as-cast and T5-treated Mg-5Gd-1.2Mn-0.4Sc (wt%) alloys were investigated and compared. The results indicate that adding 0.5 wt%Zr, 0.1 wt%Sr or 0.3 wt%Ca can refine the grains of the as-cast alloy. Among the three additions, the addition of 0.5 wt%Zr obtains the highest grain refining efficiency and followed by the additions of 0.3 wt%Ca and 0.1 wt%Sr, respectively. Furthermore, adding 0.3 wt%Ca is beneficial to the precipitation of Mg₅Gd and Mn₂Sc phases during T5 heat treatment of the alloy. In addition, adding 0.5 wt%Zr, 0.1 wt%Sr or 0.3 wt%Ca can also improve the tensile properties of the as-cast and T5-treated alloys. Among the three additions, the addition of 0.5 wt%Zr obtains the relatively highest tensile properties and followed by the additions of 0.3 wt%Ca and 0.1 wt%Sr, respectively.