Stress Induced R→B2 Transformation and Pseudoelasticity Associated with Twinning in a Ti–Ni Alloy Including Aligned Particles of Ti<SUB>3</SUB>Ni<SUB>4</SUB>

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  • Fukuda Takashi
    Department of Materials Science and Engineering, Faculty of Engineering, Osaka University
  • Deguchi Akiyoshi
    Department of Materials Science and Engineering, Faculty of Engineering, Osaka University
  • Kakeshita Tomoyuki
    Department of Materials Science and Engineering, Faculty of Engineering, Osaka University
  • Saburi Toshio
    Department of Materials Science and Engineering, Faculty of Engineering, Osaka University

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  • Stress Induced R→B2 Transformation and Pseudoelasticity Associated with Twinning in a Ti-Ni Alloy Including Aligned Particles of Ti3Ni4
  • Stress Induced R B2 Transformation and
  • Stress Induced R&rarr;B2 Transformation and Pseudoelasticity Associated with Twinning in a Ti&ndash;Ni Alloy Including Aligned Particles of Ti<SUB>3</SUB>Ni<SUB>4</SUB>

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A Ti-51 at%Ni alloy including aligned particles of Ti3Ni4 precipitate formed by aging under an applied stress exhibits an anomalous transformation, i.e., stress induced R(martensite)→B2(parent) transformation. Confirmation of this transformation was made by tensile tests combined with simultaneous resistance measurements. This alloy also exhibits pseudoelasticity associated with twinning when tensile test is made at a temperature sufficiently below its transformation temperature, i.e., in the R-phase state. The stress induced R→B2 transformation and the pseudoelasticity in the R-phase state are due to the internal stress field formed by the aligned particles of Ti3Ni4.

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