深冷轧制对AA6069铝合金组织和性能的影响  

Obdurability study of cryo-rolled AA6069 Al alloy

作　　者：杨丽娟 吴红艳[1] 高冠军[1] 张永臣 张加美 

机构地区：[1]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819

出　　处：《轻合金加工技术》2018年第1期14-19,共6页Light Alloy Fabrication Technology

基　　金：国家自然科学基金资助项目(51204050);中央高校基本科研业务费项目(N130407005)

摘　　要：为优化AA6069铝合金的综合力学性能,利用光学显微镜、扫描电镜、透射电镜、差示扫描量热法,以及硬度、强度测定,研究分析了深冷轧制和室温轧制对AA6069铝合金组织和性能的影响。结果表明,对比室温轧制,深冷轧制后样品组织更细小,经热处理后其屈服强度、抗拉强度及伸长率均显著提高(Rp0.2=425 N/mm^2,Rm=488 N/mm^2,A=7.4%);无论是室温轧制还是深冷轧制,拉伸试样断裂方式均为韧性断裂,深冷轧制铝合金的断口韧窝尺寸较大;在后续时效过程中,经深冷轧制合金的强化相比室温轧制的更易析出。In order to optimize comprehensive mechanical properties of the AA6069 Al alloy, optical microscope, SEM, TEM, DSC, and the detection of hardness and strength were used to investigate the microstructure and mechanical properties of（CR） AA6069 Al alloys by cryo-rolling and room-temperature rolling （RTR） respectively. It is obvious that a combination of cryo-rolling and heat treatments is the optimum processing condition to obtain the UFG microstructure with improved yield strength, tensile strength （ Rpo. 2 = 425 N/mm^2, Rm = 488 N/mm^2） and good tensile ductility（A =7.4% ） o No matter cryo-rolling or room temper- ature rolling, the failure mode of tensile samples is ductile dimple fracture. The size of dim- ples of cryo-rolled samples is bigger than that of room-temperature rolled samples. In the subsequent aging process , the cryo-rolled treatment has an effect on the precipitation se- quence of AA6069 Al alloy, promoting the separating out of strengthening phase.

关 键 词：深冷轧制 AA6069铝合金 短时退火 时效处理 力学性能 

分 类 号：TG335.12[金属学及工艺—金属压力加工]