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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 cooled microcrystalline Al-Li alloy was prepared and its superplasticity was studied. Thermomechanical treatment of the fast-solidified Al-Li alloy obtained superplasticity. The maximum elongation of Al-Li alloy pretreated by solution treatment + over-aging + warm-rolling + recrystallization is 585%. The optimum superplastic deformation conditions are as follows: temperature 540 ℃, strain rate 1.67 × 10 ~ (-2) s ~ 1). Observe and analyze the microstructure changes in the pretreatment and the cavities in the superplastic deformation. Superplastic fracture mainly because of the formation of voids, grow up, around the grain joint due.