MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Effect of Magnetic Field on Deformation Properties in Ferromagnetic Ni2MnGa Shape Memory Alloy
Takashi KiraKinzo MurataShozo InoueKeiji KoterazawaSoon-jong JeongGwon-seung YangKanryu Inoue
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2004 Volume 45 Issue 6 Pages 1895-1902

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Abstract

Ferromagnetic shape memory alloy Ni-25 at%Mn-23 at%Ga prepared by melting in an electric furnace was investigated to study compression properties at various temperatures with and without magnetic field. The magnetic field is applied parallel to the compression axis at a temperature below martensite finish temperature and at a temperature above austenite finish temperature. Triggering stress necessary for rearrangement of martensite variants is reduced by 0.76∼1.68 MPa (i.e., 2.5∼5.5%) when a magnetic field of 0.4∼0.6 T is applied to martensite state. The stress reduction is larger at a higher magnetic field. On the other hand, triggering stress for stress-induced martensite transformation is essentially unchanged under the same magnetic field applied to austenite state. This is due in part to very small changes in Gibbs free energy under magnetic field because of large temperature differences between Ms and Tc. and because of essentially no difference in magnetization between martensite and austenite phases.

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© 2004 The Japan Institute of Metals and Materials
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