Effects of Pre-Strain and Heat Treatment Temperature on Phase Transformation Temperature and Shape Recovery Stress of Ti-Ni-Nb Shape Memory Alloys for Pipe Joint Applications

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  • Uchida Kazunari
    Nuclear Plant Service Department, Hitachi-GE Nuclear Energy, Ltd.
  • Shigenaka Naoto
    Nuclear Plant Service Department, Hitachi-GE Nuclear Energy, Ltd.
  • Sakuma Toshio
    Faculty of Engineering, Oita University
  • Sutou Yuji
    Tohoku University Biomedical Engineering Research Organization, TUBERO Aobayama Material Science Branch
  • Yamauchi Kiyoshi
    Tohoku University Biomedical Engineering Research Organization, TUBERO Aobayama Material Science Branch

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Abstract

Effects of pre-strain and heat treatment on shape recovery stress and phase transformation temperature in Ti-Ni-Nb shape memory alloys with various Nb content (6, 9, and 12 mol%) were investigated by tensile testing. The recovery stress of Ti-Ni-Nb alloys increased with increasing the pre-strain and then decreased after reaching the maximum recovery stress of around 450–500 MPa at about 9% pre-strain. Martensitic transformation temperatures (Ms, As, Af) also increased with increasing the applied pre-strain, while the relation between As and pre-strain did not depend on the Nb contents and Ni/Ti ratio. Moreover, the recovery stress in the Ti-Ni-Nb alloy heat treated at 673 and 773 K after solution treatment was slightly higher than that in the solution-treated alloy. These behaviors were examined relative to the increased defect density due to pre-straining and the elimination of defects by heat treatment.

Journal

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 49 (7), 1650-1655, 2008

    The Japan Institute of Metals and Materials

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