变形温度对塑性变形新方法加工的AZ31镁合金显微组织和织构的影响  

Effect of deformation temperature on microstructure and texture of AZ31 magnesium alloy processed by new plastic deformation method

作　　者：范宇田 卢立伟 刘剑波 马旻 黄伟颖 巫瑞智 Yu-tian FAN;Li-wei LU;Jian-bo LIU;Min MA;Wei-ying HUANG;Rui-zhi WU(School of Materials Science and Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Jinfeng Mechanical Technology Co.,Ltd.,Loudi 417700,China;Key Laboratory of Efficient&Clean Energy Utilization,School of Energy and Power Engineering,Changsha University of Science&Technology,Changsha 410114,China;Key Laboratory of Superlight Material and Surface Technology,Ministry of Education,College of Materials Science and Chemical Engineering,Harbin Engineering University,Harbin 150001,China)

机构地区：[1]湖南科技大学材料科学与工程学院,湘潭411201 [2]湖南金峰机械科技有限公司,娄底417700 [3]长沙理工大学能源与动力工程学院,高效清洁能源利用重点实验室,长沙410114 [4]哈尔滨工程大学材料科学与化学工程学院,超轻材料与表面技术教育部重点实验室,哈尔滨150001

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第7期2138-2152,共15页中国有色金属学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52174362,51975207);Natural Science Foundation of Hunan Province,China(No.2023JJ10020);Xiangtan Special Project for Building a National Innovative City,China(No.CG-YB20221043);Yancheng“Talent Plan of Yellow Sea Pearl”for Leading Talent Project,China。

摘　　要：提出一种新的反复镦挤变形(RUE)方法。采用光学显微镜(OM)、X射线衍射(XRD)、电子背散射衍射(EBSD)和维氏硬度计分析不同变形温度对RUE变形AZ31镁合金显微组织和织构的影响。结果表明:经RUE变形后,AZ31镁合金组织局部细化至0.8μm,细化机制主要为连续动态再结晶(CDRX);随着温度的升高,首先形成平行于剪切面的基面织构,随后形成强度减弱的{11■0}<10■0>织构,最后形成{0001}<10■0>和{0001}<11■0>织构。基面和锥面位错滑移导致织构分裂。经RUE变形后AZ31镁合金的最大硬度较初始状态提高42.4%,主要原因是细晶强化和位错强化。A new method of repeated upsetting−extrusion(RUE)deformation was presented.The effects of different deformation temperatures on the microstructure and texture of RUE deformed AZ31 magnesium(Mg)alloy were studied using optical microscopy(OM),X-ray diffraction(XRD),electron backscatter diffraction(EBSD),and Vickers hardness tester.The results show that the microstructure of the AZ31 Mg alloy is locally refined to 0.8μm after RUE deformation,and the main refinement mechanism is the continuous dynamic recrystallization(CDRX).As the temperature increases,the texture of basal plane parallel to shearing plane is formed firstly,followed by{1120}á1010ñtexture with weaker intensity,and finally{0001}á1010ñand{0001}á1120ñtextures.The texture split is caused by the dislocation slip of basaláañand pyramidaláañ.The maximum hardness of the AZ31 Mg alloy after RUE deformation is increased by 42.4%compared with that at the initial state,which is mainly due to the fine-grained strengthening and the dislocation strengthening.

关 键 词：AZ31镁合金 反复镦挤变形 动态再结晶 织构 硬度 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG306[金属学及工艺—金属材料]