分析了脉冲电流对 ２０９１Ａｌ－Ｌｉ合金超塑变形中晶内位错滑移、晶界位错滑移及原子扩散的影响研究表明，脉冲电流促进位错滑移及增殖，降低原子扩散激活能，加速位错在晶界上的攀移，从而提高了超塑变形在高应变速率下的可能性．据此，建立了施加脉冲电流条件下的超塑变形速率方程 The effects of pulse current on intragranular dislocation slip, dislocation slip and atomic diffusion in the superplastic deformation of 2091Al-Li alloy were analyzed. The results show that the pulse current can promote the dislocation slip and proliferation, reduce the atomic diffusion activation energy, Accelerates the climbing of the dislocations on the grain boundaries, thereby increasing the possibility of superplastic deformation at high strain rates. Based on this, the equation of superplastic deformation rate under impulse current was established