Magnetostriction of the polycrystalline Fe80Al20 alloy doped with boron

Autor(es)

Bormio-Nunes, Cristina ^[1] ; dos Santos, Claudio Teodoro ^[1] ; de Souza Dias, Mateus Botani ^[1] ; Doerr, Mathias ^[2] ; Granovsky, Sergey ^[2] ; Loewenhaupt, Michael ^[2]

Afiliação do(s) autor(es)

^[1] Univ S Paulo, Dep Eng Mat, Escola Engn Lorena, Lorena, SP - Brazil

^[2] Tech Univ Dresden, Inst Festkorperphys, D-01062 Dresden - Germany

• Tipo de documento: Artigo Científico
• Fonte: Journal of Alloys and Compounds; v. 539, p. 226-232, OCT 25 2012.
• Citações Web of Science: 17

Resumo

The doping of Fe80Al20 polycrystalline alloy with 2% of boron increased the total magnetostriction twofold compared to a sample without boron. A value close to 80 ppm was achieved at 300 K. The microstructures of the boron-doped alloys show a dendritically solidified matrix with interdendritic alpha-FeAl and/or Fe3Al and Fe2B eutectic between the grains. The XRD analysis reveals an increase in the volume fraction of alpha-FeAl and a correspondent decrease of the Fe3Al phase volume fraction as the boron content increases. The increase of the volume fraction of this tetragonal Fe2B phase in the samples doped with boron causes the decrease of the strong volume magnetostriction that was observed in the alloy without boron. There is some evidence that the improvement of the magnetostriction magnitude due to the addition of boron to the Fe80Al20 alloy could reach the maximal magnetostriction if the 1:1 optimal ratio of the volume fractions of the alpha-FeAl and Fe3Al phases could be reached. (c) 2012 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 09/54001-2 - EMU: aquisição de equipamento cryo-free para caracterização de propriedades magnéticas por magnetometria de amostra vibrante (VSM)
• Beneficiário: Carlos Alberto Moreira dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Programa Equipamentos Multiusuários
• Processo FAPESP: 08/07463-8 - Estudo de propriedades magnetostrictivas de ligas Fe-M (M = Ga, Al) dopadas com boro
• Beneficiário: Cristina Bormio Nunes
• Modalidade de apoio: Auxílio à Pesquisa - Regular