Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 322, Issue 1-2, Pages 100-107Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0921-5093(01)01122-4
Keywords
electric current pulses; electric field; electron wind; electron push coefficient; electrochemical potential; space-charge
Ask authors/readers for more resources
The effects of high density electric current pulses (10(3)-10(6) A cm(-2)) on the (low stress of metals at low homologous temperatures and of a modest external electric field on the flow stress of fine-grained oxides at high temperatures is presented. The results in both cases are evaluated in terms of thermally-activated plastic deformation processes. In the case of the metals, the influence of an electron wind on each of the parameters in the equation for the thermally-activated motion of dislocations was determined. the largest effect being on the pre-exponential. The derived electron wind push coefficient was one or more orders of magnitude larger than the value normally accepted for the electron drag coefficient. In the ease of the oxides, the substantial effect of an applied electric field on the flow, stress was evaluated in terms of its influence on the electrochemical potential of vacancies in the space-charge cloud adjacent to the grain boundaries. Both the derived space-charge cloud width and the electric potential/stress parameter Delta empty set/Deltasigma are in reasonable accord with theoretical predictions. (C) 2002 Elsevier Science B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available