摘要
利用带有原位加热台的透射电镜观察和研究了时效态Mg-12Gd-3Y-1Sm-0.5Zr合金在从室温到200℃原位加热过程中的显微组织和相的演变。结果表明:在200℃加热时该合金中部分颗粒状、具有底心正交结构的β′相转变为面心立方的β1相,β1相形态更圆整,尺寸为纳米级。β1相与β′相具有确定的位向关系:(012)β′//(002)β1,β1相从β′相中部原子向两侧外边缘沿一定方向扩散生长,β1相耐热性更强,这一转变可有效提高合金在200℃时的抗拉强度;合金恢复至室温后,未发现β1析出相。
Microstructure and phase evolution of aging Mg-12 Gd-3 Y-1 Sm-0.5 Zr alloy during in-situ heating from room temperature to 200 ℃ were observed and studied by transmission electron microscope with in situ heating platform. The results show that part of the β′ phase with base-centered orthogonal structure is transformed into the β1 phase with face centered cubic structure when heated at 200 ℃. The shape of the β1 phase is rounder, and the size is in nanoscale. The β1 phase has a definite orientation relationship with the β′ phase:(012)β′//(002)β1. The β1phase diffuses and grows in a certain direction from the middle of the β′ phase to the outer edges on both sides, and has stronger heat resistance. This transformation can effectively improve the tensile strength of the alloy at 200 ℃. After returning to room temperature, no β1 precipitated phase is found in the alloy.
作者
付三玲
李全安
张清
FU San-ling;LI Quan-an;ZHANG Qing(School of Physics and Engineering,Henan University of Science and Technology,Luoyang 471023,China;School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2019年第11期135-140,共6页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(51571084,51171059)
河南科技大学博士科研启动基金项目
关键词
镁合金
稀土
原位透射电镜
相变
magnesium alloy
rare earth
in situ transmission electron microscope
phase change
