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Deformation behaviour and shape memory effect of near equi-atomic NiTi alloy

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Abstract

The mechanical shape memory effect associated with the martensitic-type transformation which occurs in polycrystalline Ti-50.3 at. % Ni alloy has been investigated using the techniques of transmission and optical microscopy. Deformation of initially partially transformed material within the recoverable strain range was found to occur by: (1) stress-induced transformation of the most favourably oriented existing martensite variants at the expense of adjacent unfavourably oriented variants and retained high temperature phase (2) stress-induced re-orientation of favourably oriented martensite by utilizing the most favourably oriented twin system, and (3) stress-induced twin-boundary migration within the martensite. The reverse transformation during heating restores the original grain structure of the high-temperature phase in a highly coherent manner. It was concluded that deformation modes limited to those involved in the transformation process and the reversibility of the transformation give rise to the memory effect.

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Authors and Affiliations

  1. Materials and Molecular Research Division, Lawrence Berkeley Laboratory, USA

    H. A. Mohamed & J. Washburn

  2. Department of Materials Science and Engineering, College of Engineering, University of California, Berkeley, California, USA

    H. A. Mohamed & J. Washburn

Authors
  1. H. A. Mohamed
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  2. J. Washburn
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Mohamed, H.A., Washburn, J. Deformation behaviour and shape memory effect of near equi-atomic NiTi alloy. J Mater Sci 12, 469–480 (1977). https://doi.org/10.1007/BF00540269

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  • DOI: https://doi.org/10.1007/BF00540269

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