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

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Author(s):	Dias, Mateus B. S. ; Bormio-Nunes, Cristina ; Pacheco, Clara Johanna ; Machado, Vagner de Oliveira ; Hubert, Olivier Total Authors: 5
Document type:	Journal article
Source:	Smart Materials and Structures; v. 24, n. 10, p. 7-pg., 2015-10-01.
Abstract
Textural analysis of a Fe-Al-B alloy obtained by directional solidification indicates an average direction of solidification of < 310 >, close to < 100 >. The magnetomechanical behavior is characterized by the sensing and actuation sensitivities d(33) = dB/d sigma vertical bar(II) and d(33)* = d lambda l/dH vertical bar(sigma), respectively. The Fe2B phase does not act as a pinning center against domain wall movement, proved by the achieved d(33) congruent to d(33)* reversible thermodynamic condition. This phase also does not 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(-1) MPa-1 were obtained for very low fields of similar to 4 kA m(-1), the same magnitude as 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 of benefit compared to rare earth based materials. (AU)

FAPESP's process:	11/21258-0 - Construction of a force sensor using Fe-Ga and Fe-Al doped with boron
Grantee:	Cristina Bormio Nunes
Support Opportunities:	Regular Research Grants