Papers by Keyword: Electroplastic Deformation (EPD)

Abstract: The paper presents data on structure refinement and electropulse current effects on deformability, strength and ductility of shape memory TiNi alloy, processed different severe plastic deformation techniques including equal channel angular pressing and electroplastic rolling. It was found that deformability and elongation to failure decreases with grain refinement but they can be enhanced by electropulse current.

Abstract: Electropulse current effect during cold rolling on deformability, nanostructure formation and mechanical behavior in coarse-grained (CG) and ultrafine-grained (UFG) TiNi alloys enriched by nickel is investigated. The UFG sample subjected to cold rolling with current has a fracture strain (е = 1.91) which is higher than that without a current (е = 0.59). As a result of cold rolling with a current and a subsequent annealing at 400-450 °C, nanostructure is formed in both alloys, which leads to a significant enhancement of yield and ultimate stresses. It has been shown that the efficiency of electroplastic rolling depends on the purity of the alloys.

Abstract: The aim of this paper is the investigation of electroplastic deformation (EPD) and subsequent annealing influence on martensitic transformation in the shape memory Ni50.7Ti49.3 alloy. Using differential scanning calorimetry method it was shown that EPD at the low strain stimulates structure relaxation and recovers martensitic transformation in cooling, which is usually suppressed by cold rolling.