预变形量对形变热处理2024铝合金组织和力学性能的影响  

Effect of pre-deformation on microstructure and mechanical properties of 2024 aluminum alloy after thermomechanical treatment

作　　者：蒋何苗 王小雨 肖翔 李凯 靳东 JIANG He-miao;WANG Xiao-yu;XIAO Xiang;LI Kai;JIN Dong(School of Materials Science and Engineering,Central South University,Changsha 410083,China;Changchun Automobile Manufacturing Co Ltd,Changchun 130000,China;Key Laboratory of Nonferrous Metal Materials Science and Engineering,Ministry of Education,Central South University,Changsha 410083,China;China Aluminum Materials Application Research Institute Co Ltd,Beijing 100028,China)

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083 [2]长春汽车制造有限公司,吉林长春130000 [3]中南大学有色金属材料科学与工程教育部重点实验室,湖南长沙410083 [4]中铝材料应用研究院有限公司,北京100028

出　　处：《材料热处理学报》2023年第3期68-76,共9页Transactions of Materials and Heat Treatment

摘　　要：采用维氏硬度计、万能力学试验机、扫描电镜(SEM)和透射电镜(TEM)等研究了预变形量对2024铝合金时效后力学性能和显微组织的影响。结果表明:随着预变形量的增加,合金的时效响应速度加快,硬度达到峰值的时间逐渐缩短,硬度峰值呈现先增加后减小的趋势。当预变形量为2.0%时,合金经190℃×7 h的峰时效,能够获得比较理想的强塑性匹配,其屈服强度达到489.7 MPa,抗拉强度达到509.4 MPa,断后伸长率为11.3%。这是因为当预变形量为2.0%时,合金中S相的数量增加而尺寸减少,能够有效阻碍位错运动,显著提高合金的强度,但会降低塑性。Effect of pre-deformation on mechanical properties and microstructure of 2024 aluminum alloy after aging was studied by means of Vickers hardness tester,universal mechanical testing machine,scanning electron microscopy(SEM)and transmission electron microscopy(TEM).The results show that with the increase of pre-deformation,the aging response speed of the alloy is accelerated,the time to reach the peak hardness is gradually shortened,and the peak hardness first increases and then decreases.When the predeformation is 2.0%,after aging at 190℃for 7 h,an ideal strength plasticity match of the alloy can be obtained,the yield strength reaches 489.7 MPa,the tensile strength reaches 509.4 MPa,and the elongation is 11.3%.This is because when the pre-deformation is 2.0%,the number of S phases in the alloy increases and the size decreases,which can effectively hinder the movement of dislocations,and significantly improve the strength of the alloy,but reduce the plasticity.

关 键 词：2024铝合金 预变形 时效 S相 

分 类 号：TG146.2[一般工业技术—材料科学与工程]