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Study of magnetostrictive properties of Fe-M (M = Al, Ga) alloys doped with boron

Grant number: 08/07463-8
Support type:Regular Research Grants
Duration: October 01, 2008 - April 30, 2011
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal researcher:Cristina Bormio Nunes
Grantee:Cristina Bormio Nunes
Home Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil


In the present work we propose to study Fe-Ga and Fe-Al alloys with boron addition in polycrystalline and rapid solidified samples. Both, the addition of boron and the rapid solidification are used to inhibit the ordering of the A2 disordered to ordered DO3 phase, for Ga and Al concentrations near 19%, because the A2 phase is the one that gives the larger magnetostriction values at room temperature. It was also already demonstrated that the addition of boron improves the deformation behavior of Fe-Ga alloys that present grain boundary cracks and then setting these materials more attractive for applications. On the other hand, in the case of Fe-27%Ga alloy, the magnetostriction is also very high, but in this case the phase present is the DO3 and the factor attributed to the high value of the magnetostriction is the continuous lattice softening due to the shear modulus decrease associated to the decrease of the magnetic coupling due to the increase of Ga content in the alloy. We like to study also in the present work the effect of boron addition in the Fe-27%Ga alloy. In a preceding study we identified that Fe-25%Ge and Fe-30%V alloys presented magnetostriction values of -30 and 27 ppm, respectively. It is our intention to study the magnetostrictive behavior of these two alloys with Ge contents > 25% and V contents > 30%, also in polycrystalline and rapid solidified samples. (AU)

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Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
BORMIO-NUNES, CRISTINA; RODRIGUES BOCCIA, DANIEL LOURENCO; FULOP, GUILHERME ORIGO; SATO-TURTELLI, REIKO. Assessment of Co-Ga alloys magnetostriction. Journal of Magnetism and Magnetic Materials, v. 441, p. 93-97, NOV 1 2017. Web of Science Citations: 0.
BORMIO-NUNES, CRISTINA; DIAS, MATEUS BOTANI; GHIVELDER, LUIS. High magnetostriction of the polycrystalline alloy (Fe0.8Al0.2)(97)B-3. Journal of Alloys and Compounds, v. 574, p. 467-471, OCT 15 2013. Web of Science Citations: 11.
BORMIO-NUNES, CRISTINA; DOS SANTOS, CLAUDIO TEODORO; DE SOUZA DIAS, MATEUS BOTANI; DOERR, MATHIAS; GRANOVSKY, SERGEY; LOEWENHAUPT, MICHAEL. Magnetostriction of the polycrystalline Fe80Al20 alloy doped with boron. Journal of Alloys and Compounds, v. 539, p. 226-232, OCT 25 2012. Web of Science Citations: 17.
BORMIO-NUNES, CRISTINA; NUNES, CARLOS ANGELO; COELHO, ADELINO A.; SODERO TOLEDO FARIA, MARIA ISMENIA; SUZUKI, PAULO ATSUSHI; COELHO, GILBERTO CARVALHO. Magnetization studies of binary and ternary Co-rich phases of the Co-Si-B system. Journal of Alloys and Compounds, v. 508, n. 1, p. 5-8, OCT 15 2010. Web of Science Citations: 7.

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