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Microstructure of Surface and Subsurface Layers of a Ni-Ti Shape Memory Microwire

Published online by Cambridge University Press:  15 January 2009

H. Tian ,
D. Schryvers ,
S. Shabalovskaya  and
J. Van Humbeeck
H. Tian
Affiliation:
EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
D. Schryvers*
Affiliation:
EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium
S. Shabalovskaya
Affiliation:
MTM, K.U. Leuven, Kasteelpark Arenberg, B-3001 Leuven, Belgium On leave from Ames Laboratory–DOE, Ames, IA 50011, USA
J. Van Humbeeck
Affiliation:
MTM, K.U. Leuven, Kasteelpark Arenberg, B-3001 Leuven, Belgium
*
*Corresponding author. E-mail: nick.schryvers@ua.ac.be
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Abstract

The microstructure of a 55 μm diameter, cold-worked Ni-Ti microwire is investigated by different transmission electron microscopy techniques. The surface consists of a few hundred nanometer thick oxide layer composed of TiO and TiO2 with a small fraction of inhomogeneously distributed Ni. The interior of the wire has a core-shell structure with primarily B2 grains in the 1 μm thick shell, and heavily twinned B19′ martensite in the core. This core-shell structure can be explained by a concentration gradient of the alloying elements resulting in a structure separation due to the strong temperature dependence of the martensitic start temperature. Moreover, in between the B2 part of the metallic core-shell and the oxide layer, a Ni3Ti interfacial layer is detected.

Keywords

nickel-titanium microwireTEMshape memorysurface modificationcomposition gradientsurface oxiderutileNi releaseEELS
Type
Materials Applications
Information
Microscopy and Microanalysis , Volume 15 , Issue 1 , February 2009 , pp. 62 - 70
Copyright
Copyright © Microscopy Society of America 2009

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