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Repeated realization of the shape memory effect in TiNi alloy

  • Titanium and Its Alloys
  • Published:
Metal Science and Heat Treatment Aims and scope

Conclusions

  1. 1.

    The change in strain parameters during thermal cycling of TiNi alloy under load through the martensitic transformation range governs the tendency of the alloy towards socalled martensitic transformation creep (MTC). Consideration of MTC on the basis of ideas about the instability of crystal lattices makes it possible to interpret residual strain accumulation in the material with a reduction in activation energy for operation of dislocation sources in the temperature range of martensitic transformations.

  2. 2.

    Strain hardening (for example, during wire drawing with a high-temperature B2-phase structure) promotes an increase in yield strength of the matrix, which prevents development of thermoelastic martensitic transformation and thus suppresses the tendency towards MTC for alloy TiNi, it shifts the martensitic transformation temperature range into the region of lower temperatures, and it reduces the amount of SME. A subsequent softening anneal restores SME in the alloy. The optimum temperature for the softening anneal providing a high set of temperature and deformation-force parameters for SME is 450–500°C. These parameters are stable during thermal cycling on a base of 104 cycles under stress not exceeding 300–400 N/mm2.

  3. 3.

    The thermomechanical treatment suggested makes it possible over wide ranges to vary mechanical properties, temperature and deformation-force parameters for SME of TiNi alloy, and mainly to optimize them with the aim of improving reliability and stability for operation of elements of this alloy under conditions of repeated SME realization.

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Authors
  1. M. L. Bernshtein
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  2. B. P. Khasenov
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  3. U. Khas'yanov
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Additional information

Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 2, pp. 49–55, February, 1987.

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Bernshtein, M.L., Khasenov, B.P. & Khas'yanov, U. Repeated realization of the shape memory effect in TiNi alloy. Met Sci Heat Treat 29, 150–157 (1987). https://doi.org/10.1007/BF00667531

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  • DOI: https://doi.org/10.1007/BF00667531

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