Modeling the Microstructure Evolutions of NiTi Thin Film During Tension

  • S. E. Esfahani
  • I. Ghamarian
  • V. I. Levitas
  • P. C. Collins
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

A microscale phase field model for the multivariant martensitic phase transformation is advanced and utilized for studying the pseudoelastic behavior of a thin film of equiatomic single crystal NiTi under tensile loading. The thermomechanical model includes the strain softening as a mechanism leading to strain (transformation) localization and discrete microstructure formation. To avoid a small scale limitation, gradient term is dropped. Numerical solutions have shown a negligible mesh sensitivity for different element shapes and densities, which is due to rate-dependent kinetic equations for phase transformation. Microstructure evolution and corresponding stress-strain curves are presented for several cases. Obtained stress-strain curves, band-like martensitic microstructure, a sudden drop in the stress at the beginning of the martensitic transformation, residual austenite, and multiple stress oscillations due to nucleation events are qualitatively similar to those in known experiments.

Keywords

Martensitic phase transition NiTi Localization Single crystal 

Notes

Acknowledgements

The support of NSF (CMMI-1536925 and DMR-1434613), ARO (W911NF-17-1-0225), XSEDE (TG-MSS140033), and ISU (Schafer 2050 Challenge Professorship and Vance Coffman Faculty Chair Professorship) is gratefully acknowledged.

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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • S. E. Esfahani
    • 1
  • I. Ghamarian
    • 2
  • V. I. Levitas
    • 3
  • P. C. Collins
    • 4
  1. 1.Department of Aerospace EngineeringIowa State UniversityAmesUSA
  2. 2.Department of Materials Science & EngineeringUniversity of MichiganAnn ArborUSA
  3. 3.Departments of Aerospace Engineering, Mechanical Engineering, and Material Science & EngineeringIowa State UniversityAmesUSA
  4. 4.Department of Materials Science & EngineeringIowa State UniversityAmesUSA

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