脉冲电流对2091Al-Li合金超塑变形机理的影响  

EFFECT OF CURRENT PULSE ON MECHANISM OF SUPERPLASTIC DEFORMATION OF 2091 Al-Li ALLOY

作　　者：刘志义[1] 刘冰[2] 邓小铁 雷毅 崔建忠[3] 白光润[3] 

机构地区：[1]中南工业大学材料科学与工程系,长沙410083 [2]石油大学(华东)机电工程系,东营257062 [3]东北大学材料冶金学院,沈阳110006

出　　处：《金属学报》2000年第9期944-951,共8页Acta Metallurgica Sinica

基　　金：山东省自然科学基金!097F01147;国家教委博士点基金!9114516

摘　　要：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。Effects of current pulse on interior dislocation sliping, grain boundary dislocation sliping and atom diffusion in the superplastic deformation of 2091 Al-Li alloy have been analysed. It is found that current pulse promotes dislocation sliping and multiplication, decreases activiatinn energy for atom diffusion,accekerates the climb of dislocation in grain boundary,and increased the ability of superplasticity under high strain rate. On this basis, the rate equation for superplastic deformation under current pulses has been established.

关 键 词：脉冲电流 2091AL-LI合金 超塑变形机理 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG39[金属学及工艺—金属材料]