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Cyclic magnetic-field -induced deformation and magneto-mechanical fatigue of Ni-Mn-Ga ferromagnetic martensites

Published online by Cambridge University Press:  01 February 2011

P. Müllner ,
V. A. Chernenko ,
D. Mukherji  and
G. Kostorz
P. Müllner
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
V. A. Chernenko
Affiliation:
Institute of Magnetism, Vernadsky str. 36-b, 03142 Kiev, Ukraine
D. Mukherji
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
G. Kostorz
Affiliation:
ETH Zürich, Institute of Applied Physics, CH-8093 Zürich, Switzerland
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Abstract

Four Ni-Mn-Ga single crystals exhibiting modulated 10M and 14M martensites were exposed to rotating magnetic fields of 1 and 2 T. Large periodic magnetic-field-induced strains were obtained for crystals that had been subjected to a mechanical stress while the martensite formed on cooling and to deformation in a magnetic field prior to the experiments with rotating field. A reduction of the magnetic-field-induced strain and fracture occurred when the field-induced strain was close to the transformation strain whereas a constant magneto-mechanical response was detected over more than 10 million field cycles when the field-induced strain was small. The cyclic magneto-mechanical response is related to the interaction of groups of twinning dislocations and twin boundaries. If the dislocations move in large groups, they nucleate cracks at twin boundaries. If the dislocations move in small groups, no cracks are formed resulting in a long lifetime.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 785: Symposium D – Materials and Devices for Smart Systems , 2003 , D12.2
Copyright
Copyright © Materials Research Society 2004

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References

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