高强度Al⁃Zn⁃Mg⁃Cu合金等通道角挤压后的微观结构研究  

Microstructural characterization of high strength Al⁃Zn⁃Mg⁃Cu alloy processed by equal channel angular pressing

作　　者：应向荣 江彬彬 叶恒强 杜奎[1] YING Xiang-rong;JIANG Bin-bin;YE Heng-qiang;DU Kui(Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang Liaoning 110016;Ji Hua Laboratory,Foshan Guangdong 528200,China)

机构地区：[1]中国科学院金属研究所沈阳材料科学国家研究中心,辽宁沈阳110016 [2]季华实验室,广东佛山528200

出　　处：《电子显微学报》2022年第5期564-570,共7页Journal of Chinese Electron Microscopy Society

基　　金：国家自然科学基金资助项目(Nos.51901229,91960202).

摘　　要：等通道角挤压(ECAP)已广泛应用于细化金属和合金的晶粒以改善其机械性能。本文采用透射电子显微镜研究了ECAP前后Al⁃Zn⁃Mg⁃Cu合金的显微组织演变,主要关注合金中晶粒尺寸和析出相的变化。结果表明,ECAP处理前的Al⁃Zn⁃Mg⁃Cu合金晶粒尺寸为微米尺度,经ECAP处理后合金晶粒显著细化,晶粒在形貌上呈现条带状,长度约几微米,宽度为200~500 nm。经ECAP处理后析出相的尺寸和形貌发生了不同的变化,由原始的50~100 nm左右长度明显增大为100~200 nm大小,并明显主要聚集在新产生的晶界及位错交界处,这可能是由于严重的塑性变形产生的高密度位错引起的析出相非均匀形核而导致。Equal channel angular pressing(ECAP)technique has been extensively applied to refine grains of metals and alloys for optimized mechanical properties.In this paper,the ECAP was used to process Al⁃Zn⁃Mg⁃Cu alloys,and their microstructural evolution of grain size and precipitates in these alloys was investigated by transmission electron microscopy(TEM).Ultrafine grains were obtained in Al⁃Zn⁃Mg⁃Cu alloys after being processed by ECAP as analyzed by TEM.High density of dislocations induced by the severe plastic deformation is probably responsible for the changes of the size and morphology of precipitates.

关 键 词：铝合金 ECAP 微观结构 析出相 

分 类 号：O772[理学—晶体学] TU512.4[建筑科学—建筑技术科学] O763O766.1