Full-field strain evolution during intermartensitic transformations in single-crystal NiFeGa

C. Efstathiou, H. Sehitoglu, J. Carroll, J. Lambros, H. J. Maier

Research output: Contribution to journalArticlepeer-review


Using in situ digital image correlation to obtain full-field measurements, we study the intermartensitic transformations in single-crystal NiFeGa. Full-field strain measurements identify the coexistence of modulated martensite phases during the first plateau of the multistage stress-strain curve at room temperature. At a higher temperature, the measurements indicate the bypassing of one of the modulated phases. Strain as high as 13% is measured as a result of the transformation to the intermediate monoclinic modulated and final tetragonal phase. Based on the full-field strain measurements, the phase fractions during the nucleation and the progression of the transformation are obtained. The evolution of the local strain and the phase fractions prove critical in explaining strain softening, hysteresis and other phenomena observed in the stress-strain curves.

Original languageEnglish (US)
Pages (from-to)3791-3799
Number of pages9
JournalActa Materialia
Issue number15
StatePublished - Sep 2008


  • Digital image correlation
  • Martensitic transformation
  • Metastable phases
  • Nucleation of phase transformations
  • Shape memory alloy (SMA)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys


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