Open Access
Article Number 02007
Number of page(s) 4
Section Principles, Simulations, Materials: Background
Published online 01 September 2009
ESOMAT 2009, 02007 (2009)
DOI: 10.1051/esomat/200902007

Preferential selection of variants in ferromagnetic Fe-Pd alloys under magnetic field

S. Farjami, T. Fukuda and T. Kakeshita

Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2-1, Yamada-oka, Suita, Osaka 565-0871, Japan

Published online: 1 September 2009

Effect of magnetic field on microstructure formation through a disorder-order transformation has been studied in FePd alloy. Single crystal of the disordered Fe-55at%Pd is subjected to an ordering heat-treatment under a magnetic field. When the ordering heat-treatment is performed without applying a magnetic field, three lattice corresponding variants are formed equivalently. On the other hand, when the ordering heat-treatment is made under a magnetic field of 4 T and higher applied along the [001] direction of the disordered phase, a single variant with an easy axis along the field direction is obtained. A tweed microstructure has been observed at early stage of ordering with streaks in the <011> directions. High density of antiphase boundary after formation of a single variant indicates the formation of homogeneous nucleation of the ordered L10 phase in a disordered fcc matrix at the early stage of ordering.

© Owned by the authors, published by EDP Sciences 2009