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Title: Microstructure of surface and subsurface layers of a Ni-Ti shape memory microwire
Authors: Tian, H. ×
Schryvers, D.
Shabalovskaya, Svetlana
Van Humbeeck, Jan #
Issue Date: 2009
Publisher: Springer-Verlag New York
Series Title: Microscopy and microanalysis vol:15 pages:62-70
Abstract: The microstructure of a 55 mm 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 mm 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.
ISSN: 1431-9276
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

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