Abstract:The orientation relationship between different aluminium grains as well as that between the aluminium and the whisker during the superplastic deformation have been studied. In addition, the relation between recrystallization and orientation were examined. The results showed that during the superplastic deformation the orientation relationship between different aluminium grains and that between the aluminium and the whisker were unstable. There was also no definite orientation between the recrystal grains emerging in the process of superplastic deformation and the whisker. Only the recrystal grain produced in the end of deformation could keep definite orientation with the whisker. The recrystallization induced by superplastic deformation could coordinate the sliding of grain boundaries and the interfaces.

Key words: SiCw/6061Al composite superplasticity orientation recrystallization