Effect of Heat Treatment on the Structure and Properties of EW75 Magnesium Alloy Plate
In this study,Mg-7Gd-5Y-1Nd-0.5Zr alloy(EW75) was produced by melting method and then press-forged into large size plate.The properties of the Mg-7Gd-5Y-1.2Nd-0.5Zr alloy were optimized through T6 heat treatment.The microstructures of alloy were observed by means of optical microscopy (OM),scanning electron microscopy(SEM).Its mechanical properties under different heat treatment conditions were determined by tensile tests.The results indicated that increasing the solid solution temperature and prolonging the solid solution time can both lead to the dissolution of second phase in the alloy back into the matrix.The solid solution temperature affects the dissolution process more than the solid solution time.Grain growth occurred during the solid solution process.The grain size of the matrix enlarges with the increase of solid solution temperature.The tensile test result showed that the tensile strength of the alloy was significantly improved after T6 heat treatment.Its tensile strength in the same direction was nearly 40% up after T6 heat treatment.The analysis shows that T6 heat treatment can effectively eliminate the larger deformed precipitates and beneficial to the formation of hard precipitates,which leads to an improvement in the alloy’s tensile strength.
Mg-7Gd-5Y-1.2Nd-0.5Zr alloy T6 heat treatment Precipitates Brittle fracture
Juan Qu Kui Zhang Minglong Ma Yongjun Li Xinggang Li
State Key Lab for Fabrication & Processing of Nonferrous Metals, General Research Institute for Nonferrous Metals. Beijing 100088
国际会议
the Chinese Materials Congress 2012(2012年中国材料大会(CMC2012))
太原
英文
158-165
2012-07-13（万方平台首次上网日期，不代表论文的发表时间）