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Proceedings Paper

Indentation characteristics of superelastic nickel-titanium wires and a preliminary study of copper-bonded joints between them
Author(s): A. J. Muir Wood; V. Gergely; T. W. Clyne
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Paper Abstract

Wires of nickel-titanium have been tensile tested to evaluate their elastic constants, super-elastic characteristics and strength. These data are compared with the response of the same material to (hot stage) indentation testing, using both nano-indentation and micro-indentation equipment, and both a Berkovich and a spherical indenter. Indentation characteristics indicative of super-elastic behaviour are identified. In particular, the observation of enhanced indentation strain recovery when tested above the Af temperature, compared with tests performed at lower temperature, is recorded here and appears to represent a reliable indicator of super-elastic behaviour. Wires have also been joined together by liquid phase sintering, after a copper electroplating treatment, and by solid state diffusion bonding. Microstructural studies of these joints revealed the expected phases. Preliminary mechanical studies have given an indication that it may be possible to produce strong, highly porous super-elastic material in this way.

Paper Details

Date Published: 21 July 2004
PDF: 8 pages
Proc. SPIE 5387, Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics, (21 July 2004); doi: 10.1117/12.538613
Show Author Affiliations
A. J. Muir Wood, Univ. of Cambridge (United Kingdom)
V. Gergely, Univ. of Cambridge (United Kingdom)
T. W. Clyne, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 5387:
Smart Structures and Materials 2004: Active Materials: Behavior and Mechanics
Dimitris C. Lagoudas, Editor(s)

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