摘要
采用金相组织观察、常温拉伸、硬度、剥落腐蚀及导电率等方法,研究了T74双级时效制度对7050铝合金力学性能及腐蚀性能的影响。结果表明:7050铝合金随着第二级人工时效的时间延长,η'过渡相转变为η平衡相以及η平衡相的粗化,使得其硬度和拉伸性能下降;而随着保温时间延长,晶界析出相的不连续化、粗大化以及PFZ区变窄,使得其抗剥落腐蚀性能增加。
The effects of T74 two-step aging on mechanical and corrosion properties of 7050 aluminum alloy were investigated by metallographic analysis, tensile, hardness, exfoliation corrosion and conductivity tests. The results show that： with the increase of the second aging holding time, the transition phase η′ changes to the equilibrium phase η and the coarsening of η phase, so that the hardness and tensile properties decrease. And With the increase of holding time, the grain boundary precipitates are not continuous, coarse and PFZ zone narrows, so the resistance to exfoliation corrosion of 7050 aluminum alloy is increased.
出处
《热加工工艺》
CSCD
北大核心
2014年第12期187-190,共4页
Hot Working Technology
基金
南宁市科技计划经费支持项目(20121002)
关键词
7050合金
T74时效
析出相
剥落腐蚀
7050 aluminum alloy
T74 aging
precipitates
exfoliation corrosion
