In situ neutron diffraction study of twin reorientation and pseudoplastic strain in Ni-Mn-Ga single crystals

A. Pramanick, K. An, A. D. Stoica, X. L. Wang

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

Twin variant reorientation in single-crystal Ni-Mn-Ga during quasi-static mechanical compression was studied using in situ neutron diffraction. The volume fraction of reoriented twin variants for different stress amplitudes were obtained from the changes in integrated intensities of high-order neutron diffraction peaks. It is shown that, during compressive loading, ∼85% of the twins were reoriented parallel to the loading direction resulting in a maximum pseudoplastic strain of ∼5.5%, which is in agreement with measured macroscopic strain.

Original languageEnglish
Pages (from-to)540-543
Number of pages4
JournalScripta Materialia
Volume65
Issue number6
DOIs
StatePublished - Sep 2011

Funding

The authors thank Prof. T.G. Nieh from the University of Tennessee, Knoxville for providing the loadframe that was adapted for use in this work. AP acknowledges the support from a Laboratory Directed Research and Development Fund of Oak Ridge National Laboratory. The neutron scattering measurements were carried out at the Spallation Neutron Source, which is sponsored at Oak Ridge National Laboratory by the Office of Basic Energy Sciences, U.S. Department of Energy.

Keywords

  • Heusler alloys
  • Magnetic shape memory alloys
  • Neutron diffraction
  • Transition metals
  • Twinning

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