一种新型Al-Cu-Li系合金的高温变形软化机制

The Soften Mechanism of A New Type Al-Cu-Li System Alloy During Hot Deformation

对一种新型Al-Cu-Li系合金高温压缩变形软化机制进行了研究．结果表明:该合金在400℃及其以下温度变形时,以动态回复为主要软化机制,500℃变形时,除了发生动态回复外,还发生了动态再结晶;第二相粒子的存在阻碍动态回复的进行,从而有利于动态再结晶的产生,有利于合金软化;合金热变形时,高温过饱和空位促进位错作蜷线运动,使晶体得以继续滑移变形,导致合金软化．图7,参8．

The deformation softening mechanics of a new type Al-Cu-Li after hot compression was investigated. The results show that dynamic recovery occurs when temperature is below 400 ℃. At 500 ℃, dynamic recrystallization take place except dynamic recovery. The second phase prevent dynamic recovery so that is beneficial to occurrence of dynamic recrystallization and soften of the alloy. Oversaturated vacancies formed at high temperature promote dislocations to move helically, so make crystals slip deformation continue and result in the soften of the alloy. 7figs., 8refs.