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Magnetic Field-Enhanced Shape Memory Effect in Ni51.6Mn23.4Ga25 Single Crystals

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Abstract:

We have performed the various measurements of the transformation strain with and without the different external magnetic fields on the Ni51.6Mn23.4Ga25 single crystals. A stress-free and two-way thermoelastic shape memory, with -1.15% strain (negative sign represents the shrinkage) and 6 K temperature hysteresis, has been found in the single crystal. The deformation can be enhanced up to -2.35% with a bias field 1.2 T applied along the measurement direction of the parent phase [001] crystallographic axial direction. Turning the field laterally applied to [010] and [100] directions of the parent phase, however, the strain was suppressed by the field of 1.2 T to 0.56% and –0.55%, respectively, a different deformation scene. Moreover, it is found that even the field of 1.2 T does not have a significant influence on the phase transition temperature and the temperature hysteresis, which indicates that the mechanism of field-enhanced strain in this material is the twin boundary motion.

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Periodical:

Materials Science Forum (Volumes 475-479)

Pages:

2005-2008

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.475-479.2005

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Online since:

January 2005

Authors:

Y.T. Cui, Z.Y. Zhu, J.L. Chen, K.J. Liao, W.L. Wang, G.H. Wu

Keywords:

Martensitic Transformation (MT), Shape Memory Effects (SME), Transformation Strain

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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