Av. Kozlov et al., ON THE ADDITIVITY OF ACOUSTOPLASTIC AND ELECTROPLASTIC EFFECTS, Materials science & engineering. A, Structural materials: properties, microstructure and processing, 190(1-2), 1995, pp. 75-79
The influence of high density current pulses (approximately 10(3) A mm
(-2) for 25-80 mu s) and the ultrasonic deformation (2 x 10(4) Hz) on
the flow stress of Cu tested in uniaxial tension at 300 K were investi
gated with the objective of determining the mechanisms of the joint ac
tion of electroplastic (EPE) and acoustoplastic (APE) effects. The exp
erimental procedure used allows synchronization of the current pulse a
nd the ultrasonic deformation and allows the current pulse and the ult
rasonic deformation to be shifted in phase. It was found that the comb
ined APE + EPE is smaller than the sum of separate effects and depends
on the phase shift between the current pulse and the ultrasonic defor
mation. An extremum of the combined APE + EPE at a certain phase shift
between the current pulse and the ultrasonic deformation was detected
. An increase in the EPE after prior action of ultrasonic deformation
was detected. Employing the thermally activated plastic flow concept,
a differential equation for combined APE + EPE is proposed.