MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Influence of Magnetic Field Direction on Rearrangement of Martensite Variants in an Fe-Pd Alloy
Tatsuaki SakamotoTakashi FukudaTomoyuki KakeshitaTetsuya TakeuchiKohji Kishio
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2003 Volume 44 Issue 12 Pages 2495-2498

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Abstract

Influence of magnetic field direction on rearrangement of martensite variants in an Fe-31.2Pd(at%) single crystal has been investigated using thermal expansion measurement in a cooling process under the magnetic field applied along [001]P, [011]P and [111]P (“P” represents “parent” phase). We also observe these rearrangements of variants in the cooling processes under the magnetic field applied along [001]P, [011]P and [111]P by optical microscope. From the thermal expansion measurement and the optical microscope observation, the following results are obtained: the variants are rearranged almost perfectly into the variants whose a axes are parallel to the magnetic field applied along [001]P, imperfectly into the variants whose c axis is perpendicular to the magnetic field applied along [011]P and hardly along [111]P. We explain these results considering the following criterion: rearrangement of variants proceeds when a kind of shear stress generated by applying a magnetic field acting on the twinning plane is larger than the stress required for the rearrangement of variants.

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© 2003 The Japan Institute of Metals and Materials
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