晶体塑性模拟研究冷轧变形与热处理对7085铝合金织构及平面各向异性的影响  

Crystal plasticity simulation studying the effects of cold rolling deformation and heat treatment on the texture and planar anisotropy of 7085 aluminum alloy

作　　者：谭鑫 张智晨 唐赛 肖代红 刘文胜[1] TAN Xin;ZHANG Zhichen;TANG Sai;XIAO Daihong;LIU Wensheng(Powder Metallurgy Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]中南大学粉末冶金研究院,长沙410083

出　　处：《粉末冶金材料科学与工程》2024年第6期464-476,共13页Materials Science and Engineering of Powder Metallurgy

基　　金：中南大学高强结构材料国家重点实验室基金资助项目(SYSJJ2022LWS01)。

摘　　要：本文采用XRD、EBSD和拉伸实验,结合晶体塑性模拟,研究冷轧变形量和热处理对7085铝合金织构组分和塑性应变比r的影响,分析5种理想织构对平均塑性应变比r和平面各向异性指数|Δr|的影响。结果表明:冷轧过程中变形量从50%增大至80%,S织构体积分数增幅最大(10.9%),Copper织构增幅最小(2.9%),再结晶织构变化不大。热处理后,合金的Brass、S和Copper织构均减弱,且变形量为80%时S织构减幅最大(15.9%),Copper织构减幅最小(2.4%);Cube织构有所增加,且变形量越大,增幅越显著;Goss织构变化不明显。冷轧态合金的|Δr|值大于时效态的;随冷轧变形量增大,冷轧态合金的r值逐渐增大,而时效态的r值则逐渐减小,同时|Δr|值均逐渐增大。轧制织构Δr<0,而再结晶织构Δr>0。Goss织构主要提供90°方向上的抗变形能力,Cube织构在3个方向上的r值差异较小。The effects of cold rolling deformation and heat treatment on texture composition and plastic strain ratio r of 7085 aluminum alloy were investigated by XRD,EBSD,and tensile experiments combined with crystal plasticity simulation.The effects of five ideal textures on average plastic strain ratio r and planar anisotropy index|Δr|were analyzed.The results show that when the deformation increases from 50% to 80% during cold rolling,the volume fraction of S texture increases the most(10.9%),the volume fraction of Copper texture increases the least(2.9%),and the recrystallization texture changes little.After heat treatment,the Brass,S,and Copper textures of the alloys are weakened,when the deformation amount is 80%,the S texture decreases the most(15.9%)and the Copper texture decreases the least(2.4%);the Cube texture increases,and the larger the deformation is,the more significant the increase is;the Goss texture change is not obvious.The|Δr|value of cold-rolled alloy is higher than that of aged alloy;with the increase of cold rolling deformation,the r value of cold rolled alloy increases gradually,the r value of aged alloy decreases gradually,and the|Dr|value increases gradually.Rolled texture Δr<0 while recrystallization textureΔr>0.The Goss texture mainly provides resistance to deformation in the 90°direction,while the Cube texture has little difference in r value in the three directions.

关 键 词：7085铝合金 冷轧 热处理 织构 塑性应变比 晶体塑性 

分 类 号：TG146.21[一般工业技术—材料科学与工程]