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Two-way shape memory effect induced by martensite deformation and stabilization of martensite in Ti36Ni49Hf15high temperature shape memory alloy

Authors
Journal
Materials Letters
0167-577X
Publisher
Elsevier
Publication Date
Volume
57
Identifiers
DOI: 10.1016/s0167-577x(03)00291-x
Keywords
  • High Temperature Shape Memory Alloy
  • Tinihf Alloy
  • Two-Way Shape Memory Effect
  • Martensite Stabilization

Abstract

Abstract The two-way shape memory effect (TWSME) induced by martensite deformation and the stabilization of martensite of a Ti 36Ni 49Hf 15 high temperature shape memory alloy (SMA) have been investigated. The experimental results indicated that the martensite deformation is an effective method to get TWSME in the Ti 36Ni 49Hf 15 alloy even with a small deformation strain. During martensite deformation the martensite reorientation and the dislocation slip occur simultaneously. Thus an internal oriented stress field is easily created to induce the TWSME. The TWSME of the Ti 36Ni 49Hf 15 alloy shows poor stability during the subsequent thermal cycling. In addition, the martensite stabilization is caused by the martensite deformation. The variation of the elastic and irreversible energies should be responsible for this.

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