制备了急冷微晶铝锂合金并对其超塑性进行了研究。热机械处理使快凝铝锂合金获得超塑性。固溶+过时效+温轧+再结晶预处理的铝锂合金最大延伸率为585％,最佳超塑变形条件是:温度540℃,应变速率1.67×10~(-2)s~(-1)。观察分析了预处理中的组织变化和超塑变形中的空洞。超塑断裂主要因为空洞形成、长大、绕晶粒联接所致。
A rapidly solidified microcrystalline Al-Li-Cu-Mg-Zr alloy and itssuperplasicity have been investigated. An optimum tensile elongation of 585% wasobtained at 540℃ and strain rate 1.67×10~(-2)s~(-1). The superplastic Al-Li alloy is ma-nufactured using thermomechanical processing: solution, overaging, warm rollingand recrystallization. Microstructural changes in thermomechanical processing andcavitation occurred during superplastic deformation have been observed. The super-plastic failure of alloy may be caused mainly by nucleation and growth of cavitiesas well as the linkage around grains.
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