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Microstructure and phase transformation behavior of a stress-assisted heat-treated Ti-Rich NiTi shape memory alloy
, Article Journal of Materials Engineering and Performance ; Volume 21, Issue 8 , August , 2012 , Pages 1806-1812 ; 10599495 (ISSN) ; Rezaei, E ; Sharif University of Technology
Springer
2012
Abstract
In this study, the effects of stress-assisted heat treatment on the microstructure and phase transformation of a Ti-rich (Ti-49.52 at.% Ni) shape memory alloy were investigated. For this purpose, the alloy was heat treated at temperature of 500 °C for 10 h under applied stresses of 100 and 200 MPa. XRD, TEM, and repeated thermal cycling were employed to study the microstructure and transformation behavior of the heat-treated materials. Room temperature XRD diffractogram of the stress-free heat-treated material showed a weak reflection of austenite (B2), while that for the stress-assisted heat-treated materials had a high intensity implying the presence of residual austenite in the...