2A70铝合金平面应变压缩的流变行为与微观组织  

Rheological behavior and microstructure of 2A70 aluminum alloy during plane strain compression

作　　者：张秋锦 曹海龙 田宇兴 张玉春 王燕 梁瑞栋 杨森淋 王鹏卫 ZHANG Qiujin;CAO Hailong;TIAN Yuxing;ZHANG Yuchun;WANG Yan;LIANG Ruidong;YANG Senlin;WANG Pengwei(Northwest Aluminum Industry Co.,Ltd,Dingxi 748100,China;Chinalco Materials Application Research Institute Co.,Ltd.,Beijing 102209,China;Southweat Aluminum(Group)Co.,Ltd.,Chongqing 401326,China)

机构地区：[1]西北铝业有限责任公司,甘肃定西748100 [2]中铝材料应用研究院有限公司,北京102209 [3]西南铝业(集团)有限责任公司,重庆401326

出　　处：《轻合金加工技术》2024年第8期42-48,共7页Light Alloy Fabrication Technology

摘　　要：在Gleeble-3500热模拟试验机上对2A70铝合金进行平面应变压缩试验,研究了合金平面应变压缩的流变行为与微观组织演变,变形温度为350~500℃,应变速率为0.01~1 s^(-1),变形量为65%。结果表明:流变应力随着变形温度的降低而升高,随着应变速率的减小而降低。建立了2A70铝合金的本构方程,以描述变形温度、应变速率和流变应力之间的关系。Z值可描述动态再结晶程度,动态再结晶程度随着Z值的增大而减少,低温高速的条件下动态再结晶程度较弱。变形组织中含有Brass、Goss和Cube等织构。通过改变合金的热加工工艺可以调控合金的组织和性能。The plane strain compression tests were conducted on 2A70 aluminum alloy by the Gleeble-3500 thermal simulation testing machine,with the deformation temperature,strain rate and deformation amount set as 350℃-500℃,0.01 s^(-1)-1 s^(-1),and 65%,respectively.The rheological behavior and microstructural evolution were also studied under plane strain compression.The results show that the rheological stress increases with the decrease of deformation temperature and decreases with the decrease of strain rate.A constitutive equation for 2A70 aluminum alloy was established to describe the relationship between deformation temperature,strain rate,and rheological stress.The Z-value can describe the degree of dynamic recrystallization,which decreases as the Z-value increases.The degree of dynamic recrystallization is relatively weak under low temperature and high speed conditions.The deformed tissue contains textures such as Brass,Goss,and Cube.The microstructure and properties of 2A70 aluminum alloy can be controlled by changing the hot working process.

关 键 词：2A70铝合金 平面应变压缩 本构方程 流变行为 微观组织 

分 类 号：TG302[金属学及工艺—金属压力加工] TG146.21[一般工业技术—材料科学与工程]