论文部分内容阅读
通过热处理、透射电镜分析、图像分析等手段，对８０９０Ａｌ－Ｌｉ合金中δ＇（Ａｌ３Ｌｉ）相的析出长大行为进行了研究．结果表明、合金在１６０℃时效时，δ＇相半径的３次方与时效时间不成直线关系，δ＇相的析出长大存在快速和渐缓两个阶段．分析认为，随时效进行合金中过饱和空位浓度的减少造成ＬＳＷ理论模型中ｋ值的减小．
The precipitation behavior of δ ’(Al3Li) phase in 8090Al-Li alloy was studied by means of heat treatment, transmission electron microscopy and image analysis. The results show that when the alloy is aged at 160 ℃, the third power of δ ’phase does not have a direct relationship with the aging time, and the precipitation and growth of δ’ phase have two phases. It is considered that the decrease of k value in LSW theoretical model is caused by the decrease of supersaturated vacancy concentration in the alloy with aging.