冷轧变形对Al-Cu-Mg合金的显微组织与力学性能的影响  

Effect of Cold Rolling Deformation on Microstructure and Mechanical Properties ofAl-Cu-Mg Alloy

作　　者：王帅[1] 郭二军[1] 冯义成[1] 付金来 马宝霞[1] 赵思聪[1] 王雷[1] WANG Shuai;GUO Erjun;FENG Yicheng;FU Jinlai;MA Baoxia;ZHAO Sicong;WANG Lei(School of Materials Science and Chemical Engineering,Harbin University of Science and Technology,Harbin 150040,China;Northeast Light Alloy Co.,Ltd.,Harbin 150060,China)

机构地区：[1]哈尔滨理工大学材料科学与化学工程学院,哈尔滨150040 [2]东北轻合金有限责任公司,哈尔滨150060

出　　处：《材料导报》2023年第11期146-152,共7页Materials Reports

基　　金：黑龙江省“百千万”工程科技重大专项(2019ZX10A01,2020ZX03A03)。

摘　　要：采用光学显微镜、扫描电子显微镜、EBSD技术、透射电子显微镜和万能拉伸试验机等研究了冷轧变形对热轧态Al-Cu-Mg合金显微组织和性能的影响。显微组织观察结果表明,随着冷轧变形量的增加,合金中未溶的Al_(2)CuMg[Fe,Mn]相和Al_(2)Cu[Fe,Mn]相发生了破碎。基体中存在较多的棒状Al_(2)0 Cu_(2)Mn_(3)相,该相附近存在大量缠结位错,对合金产生显著强化效果。在冷轧变形量为19%时,位错密度达到最大值。同时,随着冷轧变形量的增加,S、R、Cube、Goss、Brass织构的含量也增加,〈111〉、〈110〉织构的含量降低。力学性能测试结果表明,随着冷轧变形量的增加,合金强度提高,延伸率仍保持较高水平。当冷轧变形量为11%时,合金轧向综合力学性能最佳,抗拉强度为465.0 MPa,屈服强度为291.6 MPa,延伸率为19.0%。此时,合金横向抗拉强度为469.9 MPa,屈服强度为318.0 MPa,延伸率为16.9%。The effects of cold deformation on the microstructure and properties of hot rolled Al-Cu-Mg alloy were studied by optical microscopy,scanning electron microscopy,EBSD technology,transmission electron microscopy and a universal tensile testing machine.The microstructure observation results show that with increasing cold rolling deformation,the undissolved Al_(2)CuMg[Fe,Mn]phase and Al_(2)Cu[Fe,Mn]phase in the alloy are broken.There are many rod-like Al_(2)0 Cu_(2)Mn_(3)phases in the matrix,and there are a large number of entanglement dislocations near the T phase,which have an obvious strengthening effect on the alloy.When the cold rolling deformation is 19%,the dislocation density reaches the maximum.At the same time,with the increase in cold rolling deformation,the texture content of S,R,Cube,Goss and Brass increases,and the texture content of〈111〉〈110〉decreases.The results of the mechanical property tests show that with increasing cold rolling deformation,the strength of the alloy increases,and the elongation remains at a high level.When the cold rolling deformation is 11%,the comprehensive mechanical properties of the alloy in the rolling direction are the best,with a tensile strength of 465.0 MPa,yield strength of 291.6 MPa and elongation of 19.0%.At this time,the transverse tensile strength of the alloy is 469.9 MPa,the yield strength is 318.0 MPa,and the elongation is 16.9%.

关 键 词：AL-CU-MG合金 冷轧变形 显微组织 力学性能 第二相 

分 类 号：TG166.3[金属学及工艺—热处理]