Effect of thermal and thermo-mechanical cycling on the microstructure of Ni-rich NiTi shape memory alloys

Suresh, KS and Bhaumik, Subir K and Suwas, Satyam (2013) Effect of thermal and thermo-mechanical cycling on the microstructure of Ni-rich NiTi shape memory alloys. In: Materials Letters, 99 . pp. 150-153.

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Abstract

Microstructural changes of Ni-rich NiTi shape memory alloy during thermal and thermo-mechanical cycling have been investigated using Electron Back Scattered Diffraction. A strong dependence of the orientation of the prior austenite grain on the misorientation development has been observed during thermal cycling and thermo-mechanical cycling. This effect is more pronounced at the grain boundaries compared to grain interior. At a larger applied strain, the volume fraction of stabilized martensite phase increases with increase in the number of cycling. Deformation within the martensite leads to stabilization of martensitic phase even at temperatures slightly above the austenite finish temperature. Modulus variation with respect to temperature has been explained on the basis of martensitic transformation.

Item Type:	Journal Article
Publication:	Materials Letters
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Shape Memory Alloys; Microstructure; Electron Back Scattered Diffraction; Thermo-Mechanical Cycling; Grain Boundaries
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	16 Aug 2013 07:42
Last Modified:	16 Aug 2013 07:42
URI:	http://eprints.iisc.ac.in/id/eprint/46992

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