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The present work is concerned with the investigation of shape memory Ti50Ni25Cu25 (at.%) alloy fabricated by melt spinning technique. The parameters of technology were optimized to produce the alloy in amorphous state. Dynamic crystallization of the alloy was performed by single electric pulse with duration from 2 ms to 100 ms. TEM and DSC investigations shown that the decrease of the pulse duration down to 2 ms resulted in significant refinement of the alloy structure with formation of nanosized martensitic plates (20-60 nm), and to decrease in critical temperatures of martensite transformations. The shape memory behavior of the studied alloy was characterized by strain-temperature curves obtained by thermal cycling the specimens through the transformation range under constant stress. It was found that the nanostructurization of the alloy led to some increase of completely recovery strain.

Effect of pulsed heat treatment on structural and thermomechanical properties of rapidly quenched TiNiCu alloys