Open Access
Article Number 02014
Number of page(s) 7
Section Principles, Simulations, Materials: Background
Published online 01 September 2009
ESOMAT 2009, 02014 (2009)
DOI: 10.1051/esomat/200902014

Structural and microhardness changes during long-term storage of Ti-Ni shape memory alloys after plastic deformation

A.V. Korotitskiy1, K.E. Inaekyan1, 2, V. Brailovski1, 2 and S.D. Prokoshkin1

1  Moscow Institute of Steel and Alloys, 4, Leninsky prosp., Moscow 119049, Russia
2  Ecole de Technologie Superieure, 1100, Notre-Dame Street West, Montreal, H3C 1K3, Canada

Published online: 1 September 2009

Quenched Ti-50.26at.%Ni and Ti-50.6at.%Ni shape memory alloys samples were subjected to cold rolling (CR) with true strains from moderate (logarithmic thickness reduction e = 0.25) to severe (e = 2.1). The evaluation of structural changes in the material during its long-term storage was performed using Vickers microhardness (HV), Differential Scanning Calorimetry (DSC) and X-ray diffraction techniques. It was shown that during storage, microhardness varied following a dome-shaped trend, thus reflecting the commonly encountered interaction between two concurrent time-dependent phenomena, the first responsible for material post-deformation hardening, and the second, for material post-deformation softening.

© Owned by the authors, published by EDP Sciences 2009