Stress Induced and Magnetic Field Enhanced Twin Variants Reorientation in NiMnGa Single Crystal

Abstract:

The behavior of twin variants reorientation in Ni50Mn27.5Ga22.5 single crystal under the applied mechanical stress and magnetic field was investigated. Through three times of compression, the twinning stress was reduced from 4.4MPa to 0.4MPa, and 2.5% stress induced strain was obtained. During the succedent MFIS measurement, with the increase of measurement number of times, the critical field (μ0H)c at which the MFIS jumps became lower, and the corresponding jumping magnetostrain ε j, and the maximal magnetostrain εmax ascended. At last, a quasi single-variant state was realized, and the sample showed repeatable 6.21% MFIS, which is close to the theoretical value (1-c/a)*100%. The results are discussed from the point of martensitic microstructure evolution.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 2013-2016
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.2013
• Online since: January 2005
• Authors: Jing Min Wang, Cheng Bao Jiang, Hui Bin Xu
• Keywords: Compression, Magnetic Field Induced Strain (MFIS), Ni-Mn-Ga, Twinning Stress, Variants Reorientation

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