摘要
The effect of stress aging on the nucleation and growth of precipitates in Al-3 .88%Cu and Al-3.87%Cu-0.56%Mg-0.56%Ag alloys was investigated by electric res istivity measurement and transmission electron microscopy observation. The resul ts indicate that external stress promotes the formation of clusters of solute at oms or GP zones,but retards the growth of θ′ and Ω phases. A critica l phenomenon that the microstructural evolution will be modified at a certain ex ternal extress value is found in Al-Cu-Mg-Ag alloy. The applied external stre ss during aging induces preferentially oriented precipitations of θ′ and Ω in Al-Cu and Al-Cu-Mg-Ag alloys,respectively. The origin of stress- induced orientation effect is understood by analyzing interaction between extern al stress and misfit strain by Eshelby elastic inclusion theory.
The effect of stress aging on the nucleation and growth of precipitates in Al-3 .88%Cu and Al-3.87%Cu-0.56%Mg-0.56%Ag alloys was investigated by electric res istivity measurement and transmission electron microscopy observation. The resul ts indicate that external stress promotes the formation of clusters of solute at oms or GP zones,but retards the growth of θ′ and Ω phases. A critica l phenomenon that the microstructural evolution will be modified at a certain ex ternal extress value is found in Al-Cu-Mg-Ag alloy. The applied external stre ss during aging induces preferentially oriented precipitations of θ′ and Ω in Al-Cu and Al-Cu-Mg-Ag alloys,respectively. The origin of stress- induced orientation effect is understood by analyzing interaction between extern al stress and misfit strain by Eshelby elastic inclusion theory.
出处
《中国有色金属学会会刊：英文版》
CSCD
2004年第4期779-784,共6页
Transactions of Nonferrous Metals Society of China
基金
Project(5 0 2 710 84)supportedbytheNationalNaturalScienceFoundationofChina
关键词
AL-CU
AL-CU-MG-AG
铝合金
热处理
时效
形核
aluminium alloy
stress aging
stress-induced orientation effect
misfit strain
nucleation
growth
