J. Phys. IV France 115 (2004) 21
DOI: 10.1051/jp4:2004115003

The shape memory effect and superelasticity in Ti-Ni single crystals with one variant of dispersed particles

Yu.I. Chumlyakov¹, E.Yu. Panchenko¹, V.B. Aksenov¹, I.V. Kireeva¹, M.P. Kuksa¹, I. Karaman² and H. Sehitoglu<sup>3

1</sup>  Siberian Physico-Technical Institute, Novosobornaya sq. 1, Tomsk 634050, Russia
²  Texas A&M University, Department of Mechanical and Industrial Engineering, 326 Engineering/Physics Building, 3123 TAMU, Texas 77843-3123, USA
³  University of Illinois, Department of Mechanical and Industrial Engineering, Urbana, IL 61701, USA

Abstract
On [-111] single crystals of Ti-(50.8-51) at.%Ni the aging under stress results in the formation of one variant of Ti ₃Ni ₄ particles, after aging without stress four variants of particles are observed. It has been shown that the values of shape memory effect and superelasticity at tension depend on the number of particle variants and their orientation relative to the tension axis. It is revealed that elastic twinning in R-phase is connected with the convertible reorientation of R martensite in field of external stress.

© EDP Sciences 2004