A synchrotron x-ray study of texture induced by application of magnetic fields during phase-transformations in shape-memory Ni-Mn-Ga

R. Vaidyanathan, S. Yilmaz, R. C. O'Handley, D. C. Dunand

Research output: Contribution to journalArticlepeer-review

Abstract

Ni-Mn-Ga alloys can exhibit a thermoelastic phase transformation near room temperature, which is associated with the shape-memory effect (i.e., temperature-induced strain recovery after twinning) or superelasticity (i.e., strain recovery after a stress-induced phase transformation). This work uses a synchrotron X-ray transmission technique to investigate texture induced by applying magnetic fields during the phase transformation in polycrystalline Ni2MnGa. Synchrotron X-ray radiation is ideally suited for such investigations since the measurements are representative of twinning in the bulk, in contrast with measurements from conventional X-ray sources that represent surface measurements affected by surface relaxation. Magnetic texturing of polycrystalline Ni2MnGa, by cooling through the phase-transformation in the presence of a magnetic field, has potential to lead to polycrystalline materials with more compatible field-induced strains and hence increased twin boundary mobility upon application of a magnetic and/or stress field.

Original languageEnglish (US)
Pages (from-to)[d]EE2.7.1-EE2.7.6
JournalMaterials Research Society Symposium - Proceedings
Volume678
DOIs
StatePublished - 2001

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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