Mn含量对Zn⁃Mg合金微观组织和力学性能的影响  

Effects of Mn content on microstructures and mechanical properties of Zn⁃Mg alloy

作　　者：李博轩 吕金泽 王雨轩 李洪晓[1,2] 任玉平 王秀伟[3] 石建华 秦高梧 Li Boxuan;LüJinze;Wang Yuxuan;Li Hongxiao;Ren Yuping;Wang Xiuwei;Shi Jianhua;Qin Gaowu(Key Laboratory for Anisotropy and Texture of Materials Ministry of Education,Northeastern University,Shenyang 110819,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Xi’an Edwansi Medical Technology Co.,Ltd.,Xi’an 710000,China)

机构地区：[1]东北大学材料各向异性与织构教育部重点实验室,沈阳110819 [2]东北大学材料科学与工程学院,沈阳110819 [3]西安爱德万思医疗科技有限公司,西安710000

出　　处：《材料与冶金学报》2022年第4期278-284,292,共8页Journal of Materials and Metallurgy

基　　金：国家自然科学基金项目(No.51871047).

摘　　要：采用X射线衍射、扫描电镜及电子背散射衍射、室温拉伸及压缩等手段,研究了添加Mn对挤压态Zn⁃1Mg合金的组织和力学性能的影响.结果表明:Zn基体发生了完全的再结晶,MnZn_(13)相的存在阻碍了动态再结晶晶粒的长大,使Zn⁃Mg⁃Mn合金的晶粒得到了显著细化,平均晶粒尺寸最小为2.1μm;随着Mn含量的增加,合金织构由ED‖<1010>的基面纤维织构转变为ED与<0001>晶向成77°~84°夹角的非基面织构,屈服强度和抗拉强度分别由Zn⁃1Mg合金的263,332 MPa提高至Zn⁃1Mg⁃1Mn合金的317,403 MPa,但伸长率由4.2%降低至1.9%;Mg和Mn的添加使挤压态合金的拉压不对称性显著降低,挤压态合金在拉伸条件下表现出极差的塑性,但在压缩条件下却具有良好的压缩性能,压缩量超过45%也没有发生断裂.The effects of Mn addition on microstructures and mechanical properties of as-extruded Zn⁃1Mg alloy were investigated by using X⁃ray diffraction(XRD),scanning electron microscopy(SEM),electron backscattering diffraction(EBSD),tension and compression tests at room temperature.The results show that the Zn matrix exhibits a fully recrystallized microstructure,and the presence of MnZn_(13)phase impedes the growth of dynamic recrystallization grains.The grains of ternary Zn⁃Mg⁃Mn alloys aresignificantly refined.The minimum average grain size of the Zn⁃1Mg⁃1Mn alloy is 2.1μm.With the increase of Mn content,the textures of the alloys transform from ED‖<1010>basal fiber texture to the non⁃basal texture with ED deviation 77°~84°away from<0001>.The yield strength and tensile strength of binary Zn⁃1Mg and ternary Zn⁃1Mg⁃1Mn alloys increase from 263 MPa and 332 MPa to 317 MPa and 403 MPa,respectively.However,the elongation decreases from 4.2%to 1.9%.In addition,the yield asymmetry of as⁃extruded Zn alloys has been significantly reduced by the addition of Mg and Mn.Extruded alloy exhibits very poor plasticity under tensile conditions,it has good compressive properties under compression conditions.The fracture does not occur when the compression are above 45%.

关 键 词：Zn⁃Mg⁃Mn合金 反向挤压 微观组织 力学性能 

分 类 号：TG132.271[一般工业技术—材料科学与工程]