变形量对AA2024-T8I4铝合金组织及性能的影响  

Effect of deformation amount on microstructure and properties of AA2024-T8I4 aluminum alloy

作　　者：朱美怡 贾咏馨 苏睿明[1] 李广龙[1] 曲迎东[1] ZHU Mei-yi;JIA Yong-xin;SU Rui-ming;LI Guang-long;QU Ying-dong(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《中国有色金属学报》2023年第8期2428-2440,共13页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(52204394);辽宁省自然科学基金资助项目(2021-MS-235)。

摘　　要：为了改善二次时效(T6I4)在2xxx系铝合金综合性能提升方面的局限性,采用T8I4处理,即对固溶淬火后的合金分别进行1%、2%、3%和4%的冷变形。通过硬度测量、拉伸测试、摩擦磨损试验、剥落腐蚀试验、晶间腐蚀试验、电化学腐蚀试验、扫描电镜和透射电镜等方法,研究变形量对AA2024-T8I4铝合金组织及性能的影响。结果表明:AA2024-T8I4铝合金的硬度、强度、耐磨性、耐蚀性均得到一定程度的提升;冷变形可以改变合金基体的应力场,进而改变基体析出相及晶界析出相的尺寸及分布情况,促进时效过程中细小析出相的形成。合金随着冷变形量的增加,基体析出相分布均匀,数量逐渐增多,尺寸逐渐粗化;晶界析出相由半连续分布转变为断续分布。In order to improve the limitation of secondary aging(T6I4)in enhancing the comprehensive performance of 2xxx series aluminum alloy,T8I4 treatment was adopted,which involves heat-solution,quenching,cold-drawing deformation(1%,2%,3%and 4%).The effect of deformation amount on the microstructure and properties of AA2024-T8I4 alloy were investigated by hardness test,tensile test,friction and wear test,exfoliation corrosion test,intergranular corrosion test,electrochemical corrosion test,scanning electron microscope and transmission electron microscope.The results indicate that the hardness,strength,wear resistance and corrosion resistance of AA2024-T8I4 alloy are improved.The drawing deformation changes the stress field,change the size and distribution of matrix precipitates and grain boundary precipitates,and promotes the formation of fine precipitates during the aging.With the increase of the deformation amount,the matrix precipitates evenly distribute,gradually increase in quantity and coarsen in size.The grain boundary precipitates change from semi-continuous to discontinuous distribution.

关 键 词：AA2024铝合金 二次时效 冷变形 力学性能 耐蚀性 析出相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]