高应变速率载荷下ZK60镁合金的动态析出研究  

Dynamic Precipitation of ZK60 Magnesium Alloy Under High⁃Strain⁃Rate Loading

作　　者：胡丽香 杨扬[1] HU Lixiang;YANG Yang(School of Material Science and Engineering,Central South University,Changsha,410083,Hunan,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410081

出　　处：《矿冶工程》2023年第5期144-148,共5页Mining and Metallurgical Engineering

基　　金：国家自然科学基金(51871243,51574290)。

摘　　要：采用霍普金森压杆(SHPB)对T4态变形ZK60镁合金进行了高应变速率动态加载实验,结果表明,随着应变速率增大,合金流变应力增大。透射电子显微镜观测结果表明,动态加载后合金内部有大量第二相析出。硬度测量结果表明,3 000 s^(-1)应变速率加载后样品硬度由T4态的64.40HV提高到了93.05HV。高应变速率形变过程中,合金内部产生了高密度位错,且基体中析出了大量β′1、β′2等强化相。An experiment on dynamic loading at high strain rate was conducted for T4 deformed ZK60 magnesium alloy by means of split Hopkinson pressure bar(SHPB).The experimental results show that the flow stresses of the ZK60 alloy samples increase with the increasing of strain rate.Observation of transmission electron microscopy results indicate that a large number of second phases precipitated in the alloy after dynamic loading.The hardness measurement results show that the hardness of material is elevated from 64.40HV to 93.05HV after dynamic loading at 3000 s^(-1).High⁃density dislocation is generated within the ZK60 alloy and numerous reinforcing phases(β′1 andβ′2)precipitated in the matrix during deformation.

关 键 词：高应变速率 动态析出 ZK60镁合金 维氏硬度 析出相 β′1相 β′2相 

分 类 号：TG115[金属学及工艺—物理冶金]