Optimization of Heat Treatment Process on Vacuum Die-casting AT72 Magnesium Alloy

摘要：

　　The effect of heat treatment on vacuum die-casting (VDC) AT72 magnesium alloy was studied.The optimal process of heat treatment was obtained.The result shows that the alloy was composed of α-Mg,Mg17Al12 and Mg2Sn.After solution treatment at 686K for 24h,Mg17Al12 completely dissolved in α-Mg matrix.With the aging treatment following solution treatment,Mg17Al12 kept precipitating in the matrix and along grain boundary.Moreover,Mg2Sn distributed along the grain boundary did not disappear after solution treatment at 686K.This indicates that Mg2Sn phase exhibits very high thermal stability.The heat treatment process was optimized with solution at 686K for 24h plus ageing at 473K for 18h,in the condition of which AT72 magnesium alloy exhibits a maximum hardness with value of 90.8Hv.The successful application of heat treatment for AT72 magnesium alloy could be attributed to the elimination of the air bubble in the casing through VDC.However,the porosity in the cast couldn’t be efficiently eliminated by VDC,which result in the growth of shrinkage pore.

关键词： Magnesium alloy Heat treatment Micro-hardness Vacuum die-casting

作者: Daquan Li Yong Liu Jun Xu Shuang Shao Chunshui Xu Xianfeng Lu Xiangjie Yang

作者单位: National Engineering Research Center for Nonferrous Metals Compositions, General Research Institute Key Lab of Near Net Forming of Jiangxi Province, Nanchang University, 330031 Nanchang, China

会议类型: 国际会议

会议名称: the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))

会议地点: 太原

会议语种:英文

页码: 307-312

在线出版日期: 2012-07-13（万方平台首次上网日期，不代表论文的发表时间）