退火温度对Mg-4.7Gd-3.4Y-1.2Zn-0.5Zr合金中LPSO相形态的影响  

Effect of Annealing Temperature on Morphology of LPSO Phase in Mg-4.7Gd-3.4Y-1.2Zn-0.5Zr Alloy

作　　者：林霞 陈志永[1] 尚振岗 邵建波 刘楚明[1] LIN Xia;CHEN Zhiyong;SHANG Zhengang;SHAO Jianbo;LIU Chuming(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Advanced Research Center,Central South University,Changsha 410083,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]中南大学高等研究中心,湖南长沙410083

出　　处：《热加工工艺》2025年第4期73-76,81,共5页Hot Working Technology

基　　金：国家自然科学基金资助项目(51874367,51574291)。

摘　　要：以Mg-4.7Gd-3.4Y-1.2Zn-0.5Zr(wt%)挤压态合金为研究对象,采用光学显微镜、透射电镜探究退火温度对其LPSO相形态的影响。结果表明:退火温度显著影响LPSO相的结构、形貌、尺寸及分布。其中,350℃退火态合金中析出了密集的薄片状亚稳态LPSO相;随着退火温度的增加至450及500℃,退火态合金中LPSO相转变为稳态14H结构,LPSO相片层尺寸沿<0001>_(α)方向增加,沿<1010>_(α)方向减小,分布逐渐稀疏。LPSO相形态差异归因于不同温度下溶质原子固溶度和扩散行为的差异。The extruded Mg-4.7Gd-3.4Y-1.2Zn-0.5Zr(wt%)alloy was employed as the starting material.Optical microscope and transmission electron microscope were applied to investigate the effects of annealing temperature on the morphology of LPSO phase.The results show that annealing temperature significantly affects the microstructure,morphology,size and distribution of LPSO phase.The alloy is full of dense metastable LPSO phases after annealed at 350℃.While with the temperature increase to 450℃and 500℃,the LPSO phase transfers into a stable 14H structure.Meanwhile,the LPSO phase becomes thicker in<0001>_(α)direction and shorter in<1010>_(α)direction,and the distribution of LPSO phase becomes sparser.The LPSO phase morphological differences are attributed to differences in solidity and diffusion behavior of solute atoms at different temperatures.

关 键 词：Mg-4.7Gd-3.4Y-1.2Zn-0.5Zr合金 LPSO相 退火 

分 类 号：TG166.4[金属学及工艺—热处理]