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.
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