Publication
Title
Microstructure of surface and subsurface layers of a Ni-Ti shape memory microwire
Author
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.
Language
English
Source (journal)
Microscopy and microanalysis. - Cambridge, Mass.
Publication
Cambridge, Mass. : 2009
ISSN
1431-9276
Volume/pages
15(2009), p. 62-70
ISI
000262912700009
Full text (Publisher's DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 19.01.2009
Last edited 05.12.2017
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