Mn对Mg-4Zn变形镁合金组织与性能的影响  

Effect of Mn on Microstructure and Properties of Mg-4Zn Wrought Magnesium Alloy

作　　者：张坤敏 敬学锐 何雄江川 佘加[1,2] 彭鹏 陈先华[1,2] 罗素琴[1,4] 汤爱涛 ZHANG Kun-min;JING Xue-rui;HE Xiong-jiang-chuan;SHE Jia;PENG Peng;CHEN Xian-hua;LUO Su-qin;TANG Ai-tao(College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China;School of Metallurgy and Material Engineering,Chongqing University of Science and Technology,Chongqing 401331,China;School of Materials Science and Engineering,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]重庆大学国家镁合金材料工程与技术研究中心,重庆400044 [3]重庆科技学院冶金与材料工程学院,重庆401331 [4]重庆交通大学材料科学与工程学院,重庆400074

出　　处：《精密成形工程》2020年第5期46-52,共7页Journal of Netshape Forming Engineering

基　　金：国家重点研发计划(2016YFB0301100);国家自然科学基金(51901028,51971042,51531002,51474043,51701035);重庆市基础与前沿研究计划(cstc2017jcyjBX0040);重庆市院士专项基金(cstc2018jcyj-yszxX0007,cstc2019yszx-jcyjX0004)。

摘　　要：目的研究Mn对Mg-4Zn合金再结晶组织演变和力学性能的影响,发展高性能Mg-Zn-Mn变形镁合金。方法以Mg-Zn镁合金为研究对象,利用Mn元素的固溶强化增塑、刺激再结晶形核和钉扎再结晶晶界的特点,通过Mg-Zn-Mn挤压镁合金的显微组织以及室温力拉伸和压缩力学性能测试,分析挤压过程中显微组织的演变和成分对力学性能的影响。结果Mg-4Zn-2Mn合金平均晶粒尺寸为~7μm,其拉伸屈服强度、抗拉强度、伸长率、压缩屈服强度和拉压不对称性分别为226 MPa,316 MPa,17%,171 MPa,0.75。结论合金化元素Mn可有效细化变形镁合金的再结晶组织,随Mn元素含量的增加,Mg-Zn合金再结晶组织不断细化,未再结晶区域增加,合金力学性能增加,拉压不对称性改善。The paper aims to study the effect of Mn on recrystallization structure evolution and mechanical properties of Mg-4Zn alloy,to develop high-performance Mg-Zn-Mn wrought magnesium alloy.This work took Mg-Zn-Mn magnesium alloy as the research object,and made use of the solid solution strengthening and ductilizing of Mn element,stimulation of recrystallization nucleation and pinning of recrystallization grain boundaries.The microstructure of as-extruded Mg-Zn-Mn alloy and the mechanical properties of tensile and compression at room temperature were tested to analyze the effect of microstructure evolution and component during extruding on the mechanical properly.The average grain size of Mg-4Zn-2Mn alloy was^7μm,and its tensile yield strength,tensile strength,elongation,compressive yield strength and tension and compression asymmetry were 226MPa,316 MPa,17%,171 MPa and 0.75,respectively.Alloying element Mn can effectively refine the recrystallization structure of the alloy.With the increase of Mn content,the recrystallization structure of Mg-Zn alloy is continuously refined,the area of unrecrystallization increases,the strength of the alloy is enhanced,and the tension and compression asymmetry are improved.

关 键 词：镁合金 显微组织 再结晶 性能 

分 类 号：TG379[金属学及工艺—金属压力加工]