Two-Way Shape Memory Properties of a Ni-Rich Ti–Ni Alloy Aged under Tensile-Stress

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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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タイトル別名
  • Two-Way Shape Memory Properties of a Ni-Rich Ti–Ni Alloy Aged under Tensile-Stress
  • Two-Way Shape Memory Properties of a Ni

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The strength of the “all-round (two-way) shape memory effect” and the work we can gain by using this effect were investigated. The alloy used was a Ti-51 (at%)Ni alloy. In order to align particles of Ti3Ni4 precipitate, plate-shaped specimens were aged at 773 K for 6 ks under several different tensile-stresses. Thermal cycling tests under several different tensile-stresses (σTest) were made on these aged specimens. Specimens aged under an appropriate tensile-stress shrink in association with the B2→R transformation and the total shrinkage decreases with increasing σTest. Due to this shrinkage, the specimens do work on the outside: this work is the largest when σTest is between 50 and 100 MPa. The B2→R transformation start temperature of these specimens decreases as σTest increases. In association with the later R→B19′ transformation, the aged specimens shrink when σTest is below 50 MPa, and elongate when it is above. Unrecoverable strain does not remain in the specimen as long as the B2↔R transformation is repeated, but it does when the B2↔R↔B19′ transformations are repeated.

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