可降解Zn合金在室温单轴压缩下的微观组织演变  

Microstructure evolution of biodegradable zinc alloys duringuniaxial compression at room temperature

作　　者：毛成明 杨宏韬 陈厚文[1,2] 郑玉峰[3] 聂建峰[1,2,4] MAO Cheng-ming;YANG Hong-tao;CHEN Hou-wen;ZHENG Yu-feng;NIE Jian-feng(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Electron Microscopy Center,Chongqing University,Chongqing 400044,China;Department of Materials Science and Engineering,College of Engineering,Peking University,Beijing 100871,China;Department of Materials Science and Engineering,Monash University,Victoria 3800,Australia)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]重庆大学电子显微镜中心,重庆400044 [3]北京大学工学院材料科学与工程系,北京100871 [4]Department of Materials Science and Engineering,Monash University,Victoria3800,Australia

出　　处：《电子显微学报》2019年第5期490-495,共6页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(No.51131009)

摘　　要：利用电子背散射衍射技术研究了纯Zn 及Zn-0. 1wt.%Li 合金挤压棒材在室温压缩下的微观组织演变。纯Zn 在变形初期以孪生为主,孪生类型为{1012} 孪生。随着变形量的增加,孪晶数目增多并出现再结晶晶粒,后续的变形主要以动态再结晶机制为主。Zn-0. 1wt.%Li 合金在变形初期没有产生孪晶,而是在共析转变形成的Zn+LiZn4晶粒周围产生应力集中,并在原始Zn 晶粒内出现取向差。随着变形程度的增大,应力集中程度增加,在原始Zn 晶粒内会出现少量{1012} 孪晶。Electron backscattered diffraction(EBSD)technique was applied to investigate microstructure evolution of pure Zn and Zn-0.1wt.%Li extrusion bars during uniaxial compression at room temperature.It is found that{1012}twinning occurs in the pure Zn sampleat the initial stage of compression.With continued plastic deformation,the number of twins increases and recrystallized grains appear subsequently.The dynamic recrystallization accompaniesthe subsequent plastic deformation.No twins are observed in the Zn-0.1wt.%Li sample at the early stage of compression,but stress concentration around the eutectoid Zn+LiZn4 grains and misorientation inthe original Zn grains occur.With further compression,the extent of stress concentration increases and a small amount of{1012}twins appear in the original Zn grains.

关 键 词：Zn-Li 合金 压缩变形 组织演变 电子背散射衍射技术 

分 类 号：TG146.13[一般工业技术—材料科学与工程] TG306[金属学及工艺—金属材料]