SHAPE MEMORY EFFECT AND CYCLIC DEFORMATION BEHAVIOR OF <font>Ti</font>–<font>Nb</font>–<font>N</font> ALLOYS

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  • MASAKI TAHARA
    Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
  • HEE YOUNG KIM
    Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan
  • HIDEKI HOSODA
    Precision and Intelligence Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan
  • SHUICHI MIYAZAKI
    Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan

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<jats:p> The effect of 1 at.% N addition on the shape memory effect of Ti – Nb alloys was investigated. The shape memory effect and superelasticity were observed in Ti –(18–20) Nb –1.0 N and Ti –(21–25) Nb –1.0 N alloys, respectively. The Ti –23 Nb –1.0 N alloy exhibits the best superelastic properties with almost perfect recovery and small stress hysteresis among N added ternary alloys. The effect of cyclic deformation on the stability of superelasticity was investigated for the Ti –23 Nb –1.0 N alloy by loading and unloading cyclic tensile tests up to 500 cycles with a constant maximum applied strain of 2.5%. It was confirmed that the stability of superelasticity was improved by the addition of N due to the increase of the critical stress for slip. </jats:p>

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