Large internal stress-assisted twin-boundary motion in Ni2MnGa ferromagnetic shape memory alloy

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Z. H. Nie
  • D. Y. Cong
  • D. M. Liu
  • M. Pötschke
  • S. Roth
  • Y. D. Wang

Detail(s)

Original languageEnglish
Article number141907
Journal / PublicationApplied Physics Letters
Volume99
Issue number14
Publication statusPublished - 3 Oct 2011
Externally publishedYes

Abstract

The twin boundary motion driven by thermo-magnetic coupling was in-situ studied in a NiMnGa single crystal using high-energy x-ray diffraction technique. An unstable martensite with an internal stress of ∼8 MPa was obtained through a thermo-magnetic training. The triple martensite variants assisted by internal stress are distinct from the self-accommodated martensite twin variants with a stress-free state, and a single martensite-variant can be actuated only by a magnetic field of ∼0.34 T, equivalent to an actuator stress of about 1.3 MPa. The generation of so large internal stress among variants is attributed to the altered martensite nucleation sites triggered by external fields during thermo-magnetic training. © 2011 American Institute of Physics.

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Citation Format(s)

Large internal stress-assisted twin-boundary motion in Ni2MnGa ferromagnetic shape memory alloy. / Nie, Z. H.; Cong, D. Y.; Liu, D. M.; Ren, Y.; Pötschke, M.; Roth, S.; Wang, Y. D.

In: Applied Physics Letters, Vol. 99, No. 14, 141907, 03.10.2011.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review