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Influence of isochronal annealing on the microstructure and magnetic properties of Cu-free HITPERM Fe40.5Co40.5Nb7B12 alloy

Opened Access Influence of isochronal annealing on the microstructure and magnetic properties of Cu-free HITPERM Fe40.5Co40.5Nb7B12 alloy

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Autor: Gupta, P.
Ganguli, Tapas
Gupta, A.
Sinha, A.K.
Deb, S.K.
Svec Jr, P.
Franco García, Victorino
Departamento: Universidad de Sevilla. Departamento de Física de la Materia Condensada
Fecha: 2012-06-07
Publicado en: Journal of Applied Physics, 111, 113518
Tipo de documento: Artículo
Resumen: Systematic study of the effect of isochronal annealing on the structure and magnetic properties of Cu-free HITPERM alloy (Fe40.5Co40.5Nb7B12) is described herein. Mo¨ssbauer spectroscopy (MS) and anomalous x-ray diffraction (XRD) measurement at Fe K-edge (7.112 keV) jointly provide clear evidence for the presence of atomically ordered a0-FeCo (B2 structure) phase as a nanocrystalline ferromagnetic phase. Being a short range order probe, Mo¨ssbauer spectroscopy also confirms the development of an additional non-magnetic Nb-rich phase in the nanocrystalline specimens (annealed above 723 K) with simultaneous lowering of the volume fraction of ferromagnetic phases. The fraction of Fe atoms in the non-magnetic phase is rv15% upon annealing at 773 K for 1 h, which increases gradually and reaches to as high as rv19% after annealing at 923 K. This phase was not detected by XRD and transmission electron microscopy (TEM) measurements, which may be attributed to tiny crystallite size and/or high...
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Tamaño: 2.803Mb
Formato: PDF

URI: http://hdl.handle.net/11441/33473

DOI: http://dx.doi.org/10.1063/1.4728161

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