Effect of contact stresses on shape recovery of NiTiCu thin films

Gelli, Vikram NVR and Bobji, MS and Mohan, S (2014) Effect of contact stresses on shape recovery of NiTiCu thin films. In: THIN SOLID FILMS, 564 . pp. 306-313.

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Abstract

Permanent plastic deformation induced by mechanical contacts affects the shape recovery of shape memory alloys. To understand the shape recovery of NiTiCu thin films subjected to local contact stresses, systematic investigations are carried out by inducing varying levels of contact stresses using nanoindentation. The resulting indents are located precisely for imaging using a predetermined array consisting of different sized indents. Morphology and topography of these indents before and after shape recovery are characterized using Scanning Electron Microscope and Atomic Force Microscope quantitatively. Shape recovery is found to be dependent on the contact stresses at the low loads while the recovery ratio remains constant at 0.13 for higher loads. Shape recovery is found to occur mainly in depth direction of the indent, while far field residual stresses play very little role in the recovery. (C) 2014 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	THIN SOLID FILMS
Publisher:	ELSEVIER SCIENCE SA
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Keywords:	Shape memory alloys; Nanoindentation; Thin films; Contact stresses; Shape recovery
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	25 Sep 2014 06:02
Last Modified:	25 Sep 2014 06:02
URI:	http://eprints.iisc.ac.in/id/eprint/49946

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