|Number of page(s)||4|
|Section||Principles, Simulations, Materials: Background|
|Published online||01 September 2009|
Preferential selection of variants in ferromagnetic Fe-Pd alloys under magnetic fieldS. 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  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