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1 results

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

  • H. Tian, D. Schryvers, S. Shabalovskaya, J. Van Humbeeck
  • Journal:
    Microscopy and Microanalysis / Volume 15 / Issue 1 / February 2009
    Published online by Cambridge University Press:
    15 January 2009, pp. 62-70
    Print publication:
    February 2009

  • 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.