研究了脉冲电流对2091 Al-Li合金在高速超塑变形时的力学行为及断裂机制的影响。结果表明:施加脉冲电流使2091 Al-Li合金在高应变速度(10~(-2)s~(-1))时仍具有较高的应力应变速度敏感指数和超塑性能。扫描电镜观察表明,施加脉冲电流使2091 Al-Li合金的断裂机制由晶界撕裂转变成典型的超塑断裂-在粒子及晶界处形成孔洞,相互连接以至断裂。
Effects of current pulse on mechanical behaviors and fracture mechanism of2091 Al-Li superplastically deformed at high strain rate have been investigated. Applying adirect current pulse makes the 2091 Al-Li alloy still with high stress-strain rate sensiitivityexponent and superplastic properties under superplastically deformed at high strain rate of10~(-2)s~(-1). SEM observation showed that the fracture for 2091 Al-Li alloy, superplastically de-formed at high strain rate by applying current pulse, transforms from intergranular tear totypical superplastic failure, i. e., fracture by formation and coalescene of cavities at particlesand boundaries.
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