In situ high-energy X-ray studies of magnetic-field-induced phase transition in a ferromagnetic shape memory Ni-Co-Mn-In alloy

Y. D. Wang*, E-Wen Huang, Y. Ren, Z. H. Nie, G. Wang, Y. D. Liu, J. N. Deng, H. Choo, P. K. Liaw, D. E. Brown, L. Zuo

*Corresponding author for this work

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Abstract

The magnetic-field-induced phase transition behavior in a Ni45Co5Mn36.6In13.4 alloy, with and without an imposed stress, at various temperatures has been studied in situ by high-energy synchrotron X-ray diffraction. The crystallographic structure and microstructural characteristics in response to multiple external parameters (stress, temperature and magnetic fields) are traced, enabling the reversible and irreversible magnetic-field-induced transformations to be understood. The transformation kinetics as a function of temperature and magnetic field is determined by monitoring the changes of the specified diffraction peaks, which may be accurately described by the Clausius-Clapeyron relation. The X-ray absorption topographic measurements give direct evidence that inhomogeneous deformation occurred during magnetic-field-induced transformation in the polycrystalline materials. These investigations provide the fundamental structural information and functional characteristics that is crucial for the potential applications of this sort of new functional material.

Original languageEnglish
Pages (from-to)913-923
Number of pages11
JournalActa Materialia
Volume56
Issue number4
DOIs
StatePublished - 1 Feb 2008

Keywords

  • Ferromagnetic shape memory alloy
  • High-energy X-ray diffraction
  • Martensitic transformation

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    Wang, Y. D., Huang, E-W., Ren, Y., Nie, Z. H., Wang, G., Liu, Y. D., Deng, J. N., Choo, H., Liaw, P. K., Brown, D. E., & Zuo, L. (2008). In situ high-energy X-ray studies of magnetic-field-induced phase transition in a ferromagnetic shape memory Ni-Co-Mn-In alloy. Acta Materialia, 56(4), 913-923. https://doi.org/10.1016/j.actamat.2007.10.045