Kinetics of Magnetoelastic Twin-Boundary Motion in Ferromagnetic Shape-Memory Alloys

A. Pramanick, X.-L. Wang, A. D. Stoica, C. Yu, Y. Ren, S. Tang, and Z. Gai

Phys. Rev. Lett. 112, 217205 – Published 30 May 2014

Abstract

We report the kinetics of twin-boundary motion in the ferromagnetic shape-memory alloy of Ni-Mn-Ga as measured by in situ high energy synchrotron diffraction. The temporal evolution of twin reorientation during the application of a magnetic field is described by thermally activated creep motion of twin boundaries over a distribution of energy barriers. The dynamical creep exponent $μ$ was found to be $\sim 0.5$ , suggesting that the distribution of energy barriers is a result of short-range disorders.

Received 22 July 2013

DOI:https://doi.org/10.1103/PhysRevLett.112.217205

Authors & Affiliations

A. Pramanick^1,2,*, X.-L. Wang^1,†, A. D. Stoica², C. Yu^3,4, Y. Ren⁴, S. Tang^5,6, and Z. Gai⁶

¹Department of Physics and Materials Science, City University of Hong Kong, Hong Kong SAR, People’s Republic of China
²Chemical and Engineering Materials Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
³State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, People’s Republic of China
⁴Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁵Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA
⁶Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA

^*Corresponding author. apramani@cityu.edu.hk
^†Corresponding author. xlwang@cityu.edu.hk

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Vol. 112, Iss. 21 — 30 May 2014

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