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Magnetostrictive properties of Fe80Al20 alloy dopped with boron

Grant number: 10/10699-3
Support Opportunities:Scholarships in Brazil - Scientific Initiation
Effective date (Start): September 01, 2010
Effective date (End): August 31, 2011
Field of knowledge:Engineering - Materials and Metallurgical Engineering - Physical Metallurgy
Principal Investigator:Cristina Bormio Nunes
Grantee:Mateus Botani de Souza Dias
Host Institution: Escola de Engenharia de Lorena (EEL). Universidade de São Paulo (USP). Lorena , SP, Brazil


In the proposal financed by FAPESP under number 2008/07463-8, the study of (Fe80Al20)100-xBx alloys with x= 0.5, 1.0, 1.5 e 2.0 (in at. %) was proposed in polycrystalline (arc melting ) and rapid solidified samples (splat cooling). The magnetostriction results of polycrystalline as-cast samples for x < 2 show little change compared to the sample without boron. However, for x = 2.0 a gain of about 40% was obtained. For all samples with boron was observed a presence of a different phase in the grain boundaries that is probably the phase Fe2B as was already observed in FeGa alloys doped with boron. The Fe2B phase is also ferromagnetic with Curie temperature of 1015 K and therefore could have a contribution to the magnetostriction of these samples.Consequently, in the present proposal we want to study the magnetostriction of polycrystalline alloys of (Fe80Al20)100-xBx with x = 3.0, 4.0 e 5.0 % also of the Fe2B phase, produced by arc melting. The proposal is to evaluate the magnetostriction behavior for x > 2% and of the pure Fe2B phase, in order to continue the studies already started.We highlight that sutdies of magnetosrtiction of Fe-AL alloys doped with boron were not found in the literature.

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Scientific publications
(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; 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, . (08/07463-8, 11/21258-0, 10/10699-3)

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