Evolution of internal strain in austenite phase during thermally induced martensitic phase transformation in NiTi shape memory alloys

Sourav Gur, Venkateswara Rao Manga, Stefan Bringuier, Krishna Muralidharan, George N. Frantziskonis

Research output: Research - peer-reviewArticle

Abstract

New insight into the temperature dependent evolution of internal strain in the austenite phase during the martensitic phase transformation in NiTi shape memory alloys is provided via classical molecular dynamics simulations that employ well-established interatomic potentials for NiTi. It is shown, for the first time, that the developed strain tensor in the austenite phase is tetragonal in nature, with exponential temperature-dependence. Equally importantly, it is found that the developed internal strain (parallel to the habit plane) in the austenite varies linearly with the evolving martensite phase fraction. Interestingly, the Richard's equation is found to describe the temperature dependence of the martensite phase fraction as well as the internal strain components parallel to the habit plane in the austenite phase. An analysis of the temperature dependent phonon dispersion of strained austenite revealed the competition between phonon softening of the TA2 branch and internal strain that leads to stabilization of the austenite phase in the two phase regime.

LanguageEnglish (US)
Pages52-59
Number of pages8
JournalComputational Materials Science
Volume133
DOIs
StatePublished - Jun 1 2017

Fingerprint

Martensitic Transformation
Phase Transformation
Shape Memory
Internal
shape memory alloys
austenite
phase transformations
Shape memory effect
Phase transitions
Austenite
Temperature
Martensite
Phonon
Temperature Dependence
Dependent
habits
martensite
temperature dependence
temperature
Richards Equation

Keywords

  • NiTi shape memory alloy
  • Richard's equation and phonon instability
  • Transformation-induced strain

ASJC Scopus subject areas

  • Computer Science(all)
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Physics and Astronomy(all)
  • Computational Mathematics

Cite this

Evolution of internal strain in austenite phase during thermally induced martensitic phase transformation in NiTi shape memory alloys. / Gur, Sourav; Manga, Venkateswara Rao; Bringuier, Stefan; Muralidharan, Krishna; Frantziskonis, George N.

In: Computational Materials Science, Vol. 133, 01.06.2017, p. 52-59.

Research output: Research - peer-reviewArticle

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AU - Frantziskonis,George N.

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