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

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-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
Pages (from-to)[d]EE2.7.1-EE2.7.6
JournalMaterials Research Society Symposium - Proceedings
Volume678
Publication statusPublished - 2001
EventApplications of Synchrotron Radiation Techniques to Materials Science VI - San Francisco, CA, United States
Duration: 16 Apr 200120 Apr 2001

Funding

The diffraction experiments were performed at the DuPont-Northwestern-Dow Collaborative Access Team (DND-CAT) Synchrotron Research Center at the Advanced Photon Source (APS), whose staff we acknowledge for technical support. DND-CAT is supported by the E.I. DuPont de Nemours, Dow Chemical Co., NSF (through Grant DMR-9304725) and the State of Illinois. Use of APS was supported by DOE Contract W-31-102-Eng-38. We also thank Professor D.N. Seidman (Northwestern University) and Dr. J. P. Quintana (DND-CAT) for useful discussions on twinning and instrumentation, respectively.

FundersFunder number
E.I. DuPont de Nemours
National Science FoundationDMR-9304725
U.S. Department of EnergyW-31-102-Eng-38
Dow Chemical Company

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