ESOMAT 2009, 04011 (2009)
DOI: 10.1051/esomat/200904011

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

A. Shelyakov¹, N. Sitnikov¹, N. Resnina², A. Glezer³ and A. Korneev<sup>1

1</sup>  Moscow Engineering Physics Institute (State University), Kashirskoe shosse 31, 115409, Moscow, Russia
²  Research Institute of Mathematics and Mechanics, Mathematics and Mechanics Faculty, Saint-Petersburg State University, Universitetsky pr. 28, 198504, Saint-Petersburg, Russia
³  G.V.Kurdyumov Institute of Physical Metallurgy, I.P.Bardin Science Center of Ferrous Metallurgy, Vtoraya Baumanskaya ul. 9/23, 105005, Moscow, Russia

alex-shel@mail.ru

Published online: 1 September 2009

Abstract
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.

© Owned by the authors, published by EDP Sciences 2009