Effects of Cu on microstructure, mechanical properties and damping capacity of high damping Mg-1%Mn based alloy

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• 作者：Shuqun Chen ; Xuanpu Dong ; ^{xpdonghust@yahoo.cn} ; Rong Ma ; Lei Zhang ; Huan Wang ; Zitian Fan
• 关键词：Mg&ndash ; 1%Mn alloy ; Mg&ndash ; Cu&ndash ; Mn alloy ; Divorced eutectic ; Damping capacity
• 刊名：Materials Science and Engineering ; A
• 出版年：2012
• 期刊代码：61_09215093
• 类别：ms
• 出版时间：15 August, 2012
• 卷：551
• 期：Complete
• 页码：87-94
• 文件大小：2478 K

摘要

In this paper, a high damping Mg-1%Mn based alloy with good corrosion resistance and adequate strength was prepared by studying the properties of Mg-Mn alloys. The effects of Cu addition on microstructure, mechanical properties and damping capacity of Mg-1%Mn alloy were investigated. The results show that Cu addition remarkably reduces the grain size of Mg-1%Mn alloy and a new binary phase, Mg₂Cu, can be identified, which segregates at grain boundaries in the form of divorced eutectic and worsens the tensile properties. Using a low strain amplitude, the damping capacities of Mg-Cu-Mn alloys show minor variation with increasing Cu content, while with a high strain amplitude, the internal friction decreases with the smaller grain size and increasing amount of precipitates. In addition, the temperature dependent damping behavior of the Mg-Cu-Mn alloys was also discussed.