Title
Microstructure of surface and subsurface layers of a Ni-Ti shape memory microwire Microstructure of surface and subsurface layers of a Ni-Ti shape memory microwire
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Cambridge, Mass. ,
Subject
Chemistry
Source (journal)
Microscopy and microanalysis. - Cambridge, Mass.
Volume/pages
15(2009) , p. 62-70
ISSN
1431-9276
ISI
000262912700009
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
The microstructure of a 55 Êm 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 Êm 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.
Full text (open access)
https://repository.uantwerpen.be/docman/irua/d3dbea/0dc3b46f.pdf
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