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研究了拉伸条件对温轧态Al-Li-Cu-Mg-Zr合金超塑变形行为的影响.结果表明:该合金在变形初期发生了界面取向差逐渐增大,从亚晶组织向再结晶组织变化的形变促使连续再结晶过程;应变速率越高,再结晶速度越快,再结晶晶粒越细;经高应变速率的第一阶段拉伸变形后,形成的细晶组织具有高的应变速率敏感性,同时在低应变速率的第二阶段拉伸变形中发生晶粒长大而具有高的应变硬化效果,两者的综合作用是两段速率拉伸获得高延伸率的根本原因。
The effect of tensile conditions on the superplastic deformation behavior of the as-rolled Al-Li-Cu-Mg-Zr alloy was investigated. The results show that the interfacial difference increases gradually from subgrain to recrystallization The deformation of the microstructure promotes the continuous recrystallization process. The higher the strain rate, the faster the recrystallization rate, the finer the recrystallized grains. After the first stage of high strain rate tensile deformation, the formed fine grain structure has high strain Rate sensitivity. At the same time, grain growth and high strain hardening effect occur in the second stage tensile deformation of low strain rate. The combined effect of the two is the root cause of high elongation rate stretching at two stages.