表面高能喷丸Al-Zn-Mg合金的透射电子显微镜研究  

Investigation of Surface High Energy Shot Peened Al-Zn-Mg Alloy by Transmission Electron Microscope

作　　者：李茂林[1] 张亨金[2] 

机构地区：[1]环境保护部核与辐射安全中心,北京100082 [2]北京有色金属研究总院有研亿金新材料股份有限公司,北京102200

出　　处：《材料导报（纳米与新材料专辑）》2013年第2期95-97,共3页

摘　　要：通过表面高能喷丸（HESP）在Al-Zn-Mg合金表层形成等轴、随机取向的纳米晶粒,最小晶粒平均尺寸约为20 nm.表面层微观结构随距离表面深度的增加呈梯度变化,表面层依次可分为：纳米晶层（0～20 μm）、亚微米晶层（20～50μm）、过渡层（50～100 μm）.随着距离表面深度的增加,纳米晶（NC）、亚晶（SMC）、位错胞（DC）的尺寸逐渐增大,微观结构从表层等轴状的纳米晶粒,过渡到亚表面层的亚晶粒或亚晶粒与位错胞共存.Equiaxed nanocrystallites with random crystallographic orientations were obtained in the surface la yer of Al-Zn-Mg alloy sample by means of surface high energy shot peening （HESP）.The minimum average grain size of nanocrystalline was about 20 nm.Depending on the gradient variation of microstructures,the HESP treated surface layer can be subdivided into three sections along depth from the top surface,they were nanostructured regime （0～20 μm）,submicro-grained regime （20～ 50 μm）,transition regime （dislocation cell and tangling regime 50 ～ 100 μm）.With the depth increasing,the size of nanocrystallites,submicro-crystallite and dislocation cells increases,difference of microstructures was showed that formation of nano sized crystallites from coarse polycrystals,formation of submicro-crystallite or concurrent subgrains and dislocation cells.

关 键 词：表面高能喷丸 AL-ZN-MG合金 微观结构 位错胞 纳米晶层 亚微米晶层 过渡层 

分 类 号：TG113.1[金属学及工艺—物理冶金] TG146.2[金属学及工艺—金属学]