Iron-based magnetic shape memory alloy and method of...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/00 (2006.01) B22D 11/01 (2006.01) C21D 1/04 (2006.01) C21D 6/00 (2006.01) C21D 8/12 (2006.01) C22C 5/04 (2006.01) H01F 1/03 (2006.01) H01L 41/20 (2006.01)

Patent

CA 2325474

A magnetic shape memory alloy which can undergo very large magnetostriction is prepared by causing magnet-induced martensitic phase transformation through applying an external magnetic energy to an iron-based magnetic shape memory alloy, such as an iron-palladium based alloy containing palladium in an amount of 27 to 32 atomic % and an iron-platinum based alloy containing platinum in an amount of 23 to 30 atomic %, which is characterized in that it exhibits high crystal anisotropy and has a low energy grain boundary formed around it, and thus martensitic twinning phase transformation is induced by a magnetic field.

L'invention se rapporte à un alliage magnétique à mémoire de forme pouvant subir une très forte magnétostriction. Pour préparer cet alliage on provoque une transformation de phase martensitique induite par un aimant en appliquant une énergie magnétique externe à un alliage magnétique à base de fer et à mémoire de forme, tel qu'un alliage fer-palladium contenant du palladium en quantité représentant 27 à 32 % en pourcentage atomique, et un alliage fer-platine contenant du platine en quantité représentant 23 à 30 % en pourcentage atomique, qui se caractérise en ce qu'il présente une anisotropie cristalline élevée et est entouré par un joint de grain de faible énergie. Il est ainsi possible d'induire une transformation de phase de maclage martensitique au moyen d'un champ magnétique.

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