摘要
将7039铝合金热轧板材在470℃/2h条件下固溶后,分别进行T6处理、T73处理以及RRA处理。利用Hopkinson压杆技术对3种热处理态的7039铝合金进行冲击压缩实验,用光学显微镜和透射电镜对冲击后的试样进行组织观察,分析热处理制度对合金动态应力-应变行为和微观组织的影响。结果表明:经T6处理的7039铝合金在高速冲击加载时的绝热剪切敏感性明显低于T73和RRA处理的合金,经RRA处理的合金绝热剪切敏感性最大;不同热处理状态的合金在应变率为3000s-1时,组织中均产生绝热剪切带以及变形带;合金在高速冲击加载过程中产生的绝热剪切带内部组织主要是一种强回复组织。
The 7039 aluminum alloy hot-rolled plate materials were solution treated at 470℃ for 2 h and then heat treated by T6, T73 and RRA. The effects of heat treatment condition of T6, T73 and RRA on dynamic strain-rates and microstructure of the 7039 aluminum alloy were studied by impact compression experiments using split Hopkinson pressure bar （SHPB）, optical microscope （OM） and transmission electron microscopy （TEM）. The results show that the adiabatic shear sensitivity of the 7039 aluminum alloy after T6 treatment under high velocity impact is lower than that of T73 or RRA treatment, and the adiabatic shear sensitivity of 7039 aluminum alloy after RRA treatment is the highest. The adiabatic shear bands and deformation band are found in the microstructure of all of the alloy after different heat treatments in strain rate of 3 000 s^-1. The internal microstructure of the adiabatic shear bands during high velocity impact is mainly the heavy recovery microstructure.
出处
《粉末冶金材料科学与工程》
EI
2009年第6期379-384,共6页
Materials Science and Engineering of Powder Metallurgy
基金
国家自然科学基金资助项目(50671121)
湖南省科技计划资助项目(2009GK3083)
关键词
7039铝合金
热处理
动态冲击性能
显微组织
7039 aluminum alloy
heat treatment
dynamic impact properties
microstructure
