单向拉伸时不同变形量对Zn-0.05Mg合金组织的影响  

Study on microstructure and mechanical properties of extruded Zn-0. 05Mg alloy

作　　者：胡阳 任玉平[1,2] 李洪晓 蒋敏[1,2] 秦高梧 HU Yang;REN Yuping;LI Hongxiao;JIANG Min;QIN Gaowu(Northeastern University,Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education),Shenyang 110819;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,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,辽宁110819

出　　处：《中国体视学与图像分析》2022年第3期253-259,共7页Chinese Journal of Stereology and Image Analysis

基　　金：国家自然科学基金项目(No.51871047)

摘　　要：本文利用电子背散射衍射技术和室温拉伸试验,研究了挤压态Zn-0.05Mg二元合金保持应变速率10^(-3)s^(-1),在不同应变阶段时的显微组织特征。结果发现,相比挤压态合金,随着变形量增加,基体平均晶粒尺寸先增大后减小,即由挤压态的1.25±0.6μm,增加至变形量5%时的1.80±0.5μm,而当变形量增加至10%时,又减小至0.93±0.5μm,但晶粒尺寸的分布更加均匀;小角度晶界的比例却减少,但增加变形量后又有所增加。合金织构由挤压态ED//<0110>晶向的丝织构向TD与<0001>形成约75°左右夹角的非基面织构发生转变。二次加载的抗拉强度低于挤压态锌合金的抗拉强度,意味着发生了加工软化。In this paper,the microstructure characteristics of as-extruded Zn-0.05Mg binary alloy at different strain stages at a strain rate of 10^(-3)s^(-1)were studied by electron backscatter diffraction technique and room temperature tensile test.The results show that,compared with the as-extruded alloy,with the increase of deformation,the average grain size of the matrix first increases and then decreases,that is,from 1.25±0.6μm in the as-extruded state to 1.80±0.6μm when the deformation amount is 5%.0.5μm,and when the deformation increased to 10%,it decreased to 0.93±0.5μm,but the grain size distribution was more uniform;the proportion of small-angle grain boundaries decreased,but increased after increasing the deformation.The texture of the alloy transformed from the silk texture in the extruded ED//<0110>crystal orientation to the non-basal texture in which the TD and<0001>formed an angle of about 75°.The tensile strength of the secondary loading is lower than that of the as-extruded zinc alloy,which implies that work softening has occurred.

关 键 词：锌合金 力学性能 显微组织 电子背散射衍射技术 

分 类 号：R318.08[医药卫生—生物医学工程] TG146.13[医药卫生—基础医学]