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Shape-memory NiTi–Nb foams

Published online by Cambridge University Press:  31 January 2011

Ampika Bansiddhi  and
David C. Dunand
Ampika Bansiddhi*
Affiliation:
Department of Materials Engineering, Kasetsart University, Bangkok 10900, Thailand
David C. Dunand
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208
*
a) Address all correspondence to this author. e-mail: ampikaa@gmail.com
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Abstract

A new powder metallurgy technique for creating porous NiTi is demonstrated, combining liquid phase sintering of prealloyed NiTi powders by Nb additions and pore creation by NaCl space-holders. The resulting foams exhibit well-densified NiTi–Nb walls surrounding interconnected pores created by the space-holder, with controlled fraction, size, and shape. Only small amounts of Nb (3 at.%) are needed to produce a eutectic liquid that considerably improves the otherwise poor densification of NiTi powders. NiTi–Nb foams with 34–44% porosity exhibit high compressive failure stress (>1,500 MPa), ductile behavior (>50% compressive strain), low stiffness (10–20 GPa), and large shape-memory recovery strains. These thermomechanical properties, together with the known biocompatibility of the alloy, make these open-cell foams attractive for bone implant applications.

Keywords

BrazingCellular (material form)Powder metallurgy
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 6 , June 2009 , pp. 2107 - 2117
Copyright
Copyright © Materials Research Society 2009

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