Shape Memory Behavior of Ti–40.5Ni–10Cu Alloy Affected by C11<SUB>b</SUB>-Type Precipitates

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

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  • Shape Memory Behavior of Ti-40.5Ni-10Cu Alloy Affected by C11b-Type Precipitates
  • Shape Memory Behavior of Ti 40.5Ni 10Cu
  • Shape Memory Behavior of Ti&ndash;40.5Ni&ndash;10Cu Alloy Affected by C11<SUB>b</SUB>-Type Precipitates

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Abstract

Effects of precipitates of C11b-type structure formed by aging on the mechanical properties of a shape memory Ti–40.5Ni–10Cu alloy, which slightly off-stoichiometric to the Ti poor side, were studied by constant-load thermal cycling tests, conventional tensile tests and transmission electron microscopy. The shape change under a constant load, associated with thermally induced B2-B19 transformation, occurs in narrower temperature range for both the cooling and heating processes in the fully aged specimen compared to the as-solution-treated specimen. The total elongation due to thermally induced B2-B19 transformation under a constant load decreases and the 0.5% offset stress in the conventional tensile test increases with increasing aging time. These aging effects on mechanical properties are caused by the precipitates of C11b-type structure. The precipitates act as obstacle to the rearrangement of variants of the B19-martensite.

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