【摘要】 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．更多还原

【Abstract】 The processes of the precipitation and growth of δ’-phase(Al3Li) in an 8090 Al-Li alloy(Al-2.45Li-1.21 Cu-1.20Mg-0.15Zr) under different heat-treatments have been studied by TEM and image analyses.The results show that the growth of δ’-phase,the main strenthening phase in the alloy,consists of rapid and slow stages during aging at 160℃.The relationship between r3(r being the radius of δ’-particle) and aging time is not linear.As an analytical result,the value of k in LSW model may decrease as the vacancy concentration reduces.更多还原