Microstructural evolution and age-hardening behavior of quasicrystal-reinforced Mg-Dy-Zn alloy  

作　　者：Guang-Li Bi Yu-Xiang Han Jing Jiang Chun-Hong Jiang Yuan-Dong Li Ying Ma 

机构地区：[1]State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China [2]Key Laboratory of Nonferrous Metal Alloys and Processing, Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China [3]Lanshi Foundry Co., Ltd., Lanzhou 730050, China

出　　处：《Rare Metals》2019年第8期739-745,共7页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51301082 and51464031)

摘　　要：Microstructural evolution and age-hardening behavior of Mg-2 Dy-6 Zn(at%)alloy during solid-solution and aging treatment were investigated.The microstructure of as-cast alloy is composed of a-Mg,Mg3 DyZn6(Ⅰ)phase,Mg3 Dy2 Zn3(W)phase,Mg(Zn,Dy)phase and a small amount of Mg0.97Zn0.03 phases.After solid-solution treatment(480℃,12 h),all the I phases and most W phases dissolve into a-Mg matrix and the remainder W phases transform into Mg(Dy,Zn)phase and MgDy3 phase.During aging treatment,I phase and small amounts of W phases co-precipitate from α-Mg matrix,respectively.The alloy exhibits a peak hardness of HV 77.5 at 200 ℃ for 8 h.The excellent age-hardening behavior of alloy is mainly attributed to the co-precipitation strengthening of I and W phases.Microstructural evolution and age-hardening behavior of Mg-2 Dy-6 Zn（at%）alloy during solid-solution and aging treatment were investigated.The microstructure of as-cast alloy is composed of a-Mg,Mg3 DyZn6（Ⅰ）phase,Mg3 Dy2 Zn3（W）phase,Mg（Zn,Dy）phase and a small amount of Mg0.97Zn0.03 phases.After solid-solution treatment（480℃,12 h）,all the I phases and most W phases dissolve into a-Mg matrix and the remainder W phases transform into Mg（Dy,Zn）phase and MgDy3 phase.During aging treatment,I phase and small amounts of W phases co-precipitate from α-Mg matrix,respectively.The alloy exhibits a peak hardness of HV 77.5 at 200 ℃ for 8 h.The excellent age-hardening behavior of alloy is mainly attributed to the co-precipitation strengthening of I and W phases.

关 键 词：Mg-Dy-Zn ALLOY Microstructure I phase AGE-HARDENING BEHAVIOR 

分 类 号：TF[冶金工程]