Nanostructured Shape Memory TiNi Alloy Processed by Severe Electroplastic Deformation
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.
Yuri Estrin and Hans Jürgen Maier
V. V. Stolyarov "Nanostructured Shape Memory TiNi Alloy Processed by Severe Electroplastic Deformation", Materials Science Forum, Vols. 584-586, pp. 507-512, 2008