摘要
提出了一个计算高强铝合金空位形成能的半径验公式。并用此公式和准化学方法分别计算了７０７５高强铝合金在不同时效状态下晶界的结合力和断裂应力下降百分数．结果表明：晶界结合力和晶界断裂应力随着晶界上Ｍｇ偏析浓度的增加而减小．这与应力腐蚀裂纹扩展速率的实验结果相一致．
A semiempirical relationship to calculate vacancy formation energy of high strength aluminium alloy is Putforward.i. e. Ef= 1/16 EM. The percentage reductions of grain boundary binding force and fracture stress in the highstrength aluminium alloy 7075 have been calculated under different aging conditions by using the retationship and quasichemical method. The results indicate that both grain boundary binding force and fractrue stress decrease with theincreasins concentration of Mg segregation on grain boundary,as consistent whth the experimental result of propagationrate of stress corrosion cracks.
出处
《东北大学学报（自然科学版）》
EI
CAS
CSCD
1994年第1期5-9,共5页
Journal of Northeastern University(Natural Science)
基金
国家八五攻关项目
关键词
晶界偏析
空位形成能
晶界结合力
准化学方法
断裂应力
grain boundary segregation
vacancy formation energy
grain boundary binding force
quasi-chemicalmethod
fracture stress
