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High-temperature shape memory loss in nitinol: a first principles study.

Adebayo A Adeleke1, Yansun Yao

  • 1Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E2, Canada. aaa238@mail.usask.ca.

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Summary
This summary is machine-generated.

Nickel-titanium (NiTi) smart alloys can lose shape memory under high stress and temperature. This study reveals a phase transformation to P1[combining macron]-NiTi, causing permanent deformation and shape memory loss.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Materials Science

Background:

  • Shape memory alloys (SMAs) like NiTi are crucial for various applications.
  • Understanding phase transformations is key to predicting SMA behavior.
  • NiTi's B19' phase is known for its shape memory properties.

Purpose of the Study:

  • Investigate the potential for shape memory loss in NiTi alloys.
  • Analyze the transition kinetics and dynamical pathways leading to shape memory degradation.
  • Explore the conditions under which NiTi loses its shape memory functionality.

Main Methods:

  • First-principles calculations were employed to simulate atomic interactions and phase transitions.
  • Detailed analysis of transition kinetics and dynamical pathways.
  • Investigation of structural distortions and volume changes during phase transformations.

Main Results:

  • The B19' phase of NiTi can lose shape memory when subjected to high stress and temperatures above a critical point (Tc).
  • A transformation to a dynamically stable P1[combining macron]-NiTi phase occurs, which is temperature-quench recoverable.
  • The B2(B33) → B19' transition involves a β shearing mode, while the B19' → P1[combining macron] transition involves a γ shearing mode, leading to symmetry breaking and permanent deformation.

Conclusions:

  • Kinetics stabilize the P1[combining macron]-NiTi structure over the B19' structure under specific conditions.
  • The findings highlight mechanisms for shape memory loss in NiTi.
  • Further research is needed to retain and enhance shape memory properties in NiTi and other SMAs for high-performance applications.