Structure and Functional Properties of Ti-Ni-Based Shape Memory Alloy after Electroplastic Deformation
Application of electroplastic deformation (EPD) by rolling to bulk long-sized samples of Ti-50.7 at.%Ni alloy allows increasing of the deformation strain without macrofailure by 1.5 to 3 times in comparison to cold rolling without electrical current application. Structure formation and functional properties were studied after various EPD regimes: current density (84 to 168 А/mm2) and impulse duration (80 and 160 ms). When the stage of mixed nanocrystalline and amorphous structure formation is reached as a result of EPD, a post-deformation annealing at 400 °С leads to a nanocrystalline structure formation in austenite and highest recovery stress values generation by the martensite.
Yuri Estrin and Hans Jürgen Maier
I. Gurtovaya et al., "Structure and Functional Properties of Ti-Ni-Based Shape Memory Alloy after Electroplastic Deformation", Materials Science Forum, Vols. 584-586, pp. 982-987, 2008