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研究了２０９１铝锂合金超塑变形的断裂行为。扫描电镜观察表明，２０９１铝锂合金超塑变形中存在晶内断裂，光学金相观察表明断裂试样存在较活跃的动态再结晶和较多的大轴径比晶粒，透射电镜观察发现断裂试样内部存在较多的晶内位错。研究表明，由于再结晶缩小了大轴径比晶粒的横截面使其在超塑变形的晶粒转动中受到很大的弯曲应力而造成了晶内断裂。
The fracture behavior of 2091 Al-Li alloy superplastic deformation was studied. Scanning electron microscopy observations show that there is intragranular fracture in the superplastic deformation of 2091 Al-Li alloy. The optical metallographic observation shows that there are more active dynamic recrystallization and more large-diameter ratio grains in the fracture specimen. Transmission electron microscopy shows that the fracture test There are more internal dislocations within the sample. The results show that the intracrystalline fracture is caused by the fact that the recrystallization reduces the cross-section of the large-axial-to-diameter grain so that it undergoes great bending stress during the rotation of the superplastic-deformed grain.