Abstract
It has been found that the application of a high density electric current pulse during the plastic deformation of metals produces an enhancement of the deformation rate in addition to that caused by the side effects of the current such as Joule heating and the magnetic pinch effect. This additional effect has been termed an electroplastic effect (EPE). EPE consists of two contributions: (a) an electron wind force which is proportional to the current density j and a second still unclear effect which is proportional to j/sup 2/. Little work has been done on the influence of the initial strain rate epsilon/sub j=o/ on the EPE. The objective of the present study was therefore to investigate further the effect of the prior plastic strain rate on the EPE. Nb was chosen for this study because only limited prior work has been carried out on this BCC transition metal.
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