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Date of Publication:2006-01-01

Journal:中国有色金属学报

Issue:6

Page Number:1012-1018

ISSN No.:1004-0609

Abstract:The effects of a DC electric field up to 1 kV/cm on the deformation behavior of NiTi alloys were determined at constant strain rate of 2.6 × 10-2 s-1 and temperature of 600°C. The microstructures were analyzed by metallomicroscopy and SEM. The results demonstrate that the application of electric field decreases the flow stress and the tensile strength and increases the tensile elongation. The existence of the electric field also suppresses the nucleation and growth of internal cavities in tension. When NiTi alloys are tensiled at 600°C, the dynamic recrystallization occurs. Without electric field, the stress-strain curves were characterized by periodical undee graph, while under the electric field the curves present steady state. When the deformation under the electric field, the strain hardening and recrystallization take place simultaneously, thus the flow stress curves exhibits steady state. Further analyses demonstrate that the applied electric field promotes the movement of the dislocations in elevated temperature tension.

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