Features of deformation behavior at rolling and tension under current in TiNi alloy

Abstract

The paper presents data on the effect of pulse current on deformability, strength and ductility of a shape-memory TiNi alloy processed by electroplastic rolling (EPR). It has been found that deformability and elongation to failure can be enhanced by electropulse current. The deformation behavior of the TiNi alloy both at EPR processing and tension with pulse current is considered. It is shown that EPR significantly increases strain to failure and refines microstructure to a grain size under 100 nm. Stress jumps upward and downward have been observed on the stress-strain curves at tension with current. Different directions of stress jumps are conditioned by the martensite transformation and the electroplastic effect, correspondingly. © 2010 Advanced Study Center Co. Ltd.