Magnetomechanical behavior of a directly solidified Fe-Al-B alloy

Abstract : Texture analysis of the Fe-Al-B alloy obtained by directional solidification point out to an average direction of solidification <310>, close to <100>. The magnetomechanical behaviour is characterized by the sensing and actuation sensitivities d33=dB/dσ|H and d33*=dl/dH|σ, respectively. The Fe2B phase does not act as pinning centres against domain wall movement, proved by the achieved d33 ≅ d33 * reversible thermodynamic condition. This phase neither degrade the saturation magnetization of the alloy, because it has a high saturation magnetization of 1.5 T. Relatively high sensitivities of 13 kA/m/MPa were obtained for very low fields, ~ 4 kA/m, the same magnitude of that obtained in rare earth based materials, but for much lower fields. The good formability and machining properties of the Fe-Al-B alloy are also a benefit compared to rare earth based materials.
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Mateus Dias, Cristina Bormio-Nunes, Clara Pacheco, Vagner de Oliveira Machado, Olivier Hubert. Magnetomechanical behavior of a directly solidified Fe-Al-B alloy. Smart Materials and Structures, IOP Publishing, 2015, 24, pp.105004 - 105004. ⟨10.1088/0964-1726/24/10/105004⟩. ⟨hal-01531791⟩



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