Mg-10Gd-3Y-0.5Zr合金在压缩变形中的滑移系激活规律和塑性变形不均匀性  

Operating slip modes and inhomogeneous plastic deformation of Mg-10Gd-3Y-0.5Zr alloy during compression

作　　者：江志伟 尹冬弟 万有富 倪然 周浩 郑江[3] 王渠东[4] Zhi-wei JIANG;Dong-di YIN;You-fu WAN;Ran NI;Hao ZHOU;Jiang ZHENG;Qu-dong WANG(Key Laboratory of Advanced Technologies of Materials,Ministry of Education,School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China;Nano and Heterogeneous Materials Center,School of Materials Science and Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Shenyang National Laboratory for Materials Science,International Joint Laboratory for Light Alloys(Ministry of Education),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;National Engineering Research Center of Light Alloys Net Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]西南交通大学材料科学与工程学院材料先进技术教育部重点实验室,成都610031 [2]南京理工大学材料科学与工程学院纳米异构材料中心,南京210094 [3]重庆大学材料科学与工程学院教育部轻合金材料国际合作联合实验室沈阳材料科学国家研究中心,重庆400044 [4]上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心,上海200240

出　　处：《Transactions of Nonferrous Metals Society of China》2023年第1期79-94,共16页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52171125,52071178);The fundamental Research Funds for the Central Universities,China(No.2682020ZT114);the Key R&D Projects in the Field of High and New Technology of Sichuan Province,China(Nos.20ZDYF0490,20ZDYF0236);Open Funding of International Joint Laboratory for Light Alloys(MOE),Chongqing University,China。

摘　　要：为了定量和统计地了解高性能铸造Mg-10Gd-3Y-0.5Zr(质量分数,%,GW103)合金在室温单轴压缩变形中滑移系的激活规律和塑性变形不均匀性,对时效状态的该合金进行详细的滑移迹线分析和基于取向差的电子背散射衍射(EBSD)分析。在2%塑性应变后,根据鉴别的滑移迹线的相对比例,激活的滑移模式首先为基面滑移(73.3%),其次是柱面滑移(15.8%),然后是二级角锥面滑移(6.9%),最后是一级角锥面滑移(4%)。尽管大多数激活的滑移系表现出较大的施密特因子(m)值(>0.3),但值得注意的是,一些硬取向(m<0.1)的滑移系也被激活。对于大多数表现出极大几何必需位错(GND)密度的晶界,至少满足以下条件之一:晶界取向差角(GBMA)较大;相邻晶粒间特定滑移模式m_(max)之差较大。晶粒的塑性变形不均匀性(GND密度的大小/分布)与是否能观察到滑移迹线无关。晶内取向分布(GOS)和/或平均GND密度与m_(max)(对于特定滑移模式)没有明显的相关性。To understand the operating slip modes and inhomogeneous plastic deformation quantitatively and statistically for a high-performance cast Mg-10Gd-3Y-0.5Zr(wt.%,GW103)alloy during room-temperature uniaxial compression,detailed slip trace analysis and electron backscatter diffraction(EBSD)based misorientation analysis of this alloy in aged condition were carried out.After 2%plastic strain,according to relative frequency of identified slip traces,the active slip modes were basalslip(73.3%),followed by prismaticslip(15.8%),then second-order pyramidalslip(6.9%),and finally first-order pyramidalslip(4%).Although most of the active slip systems exhibited large Schmid factor(m)values(>0.3),it was worth noting that some hard-oriented(m<0.1)slip systems were also active.For most of the grain boundaries exhibiting extremely large geometrically necessary dislocation(GND)density,at least one of the following conditions was satisfied:large grain boundary misorientation angle(GBMA)and/or large deviation of m_(max)for particular slip mode between neighboring grains.The plastic heterogeneity of grains(magnitude/distribution of GND density)was independent of the visibility of slip traces.The grain orientation speared(GOS)and/or grain average GND density showed no obvious correlation with m_(max)(for particular slip mode).

关 键 词：稀土镁合金 滑移系激活规律 滑移迹线分析 塑性变形不均匀性 几何必需位错密度 

分 类 号：TG146.22[一般工业技术—材料科学与工程]