Article
Influence of isochronal annealing on the microstructure and magnetic properties of Cu-free HITPERM Fe40.5Co40.5Nb7B12 alloy
dc.creator | Gupta, P. | |
dc.creator | Ganguli, Tapas | |
dc.creator | Gupta, A. | |
dc.creator | Sinha, A.K. | |
dc.creator | Deb, S.K. | |
dc.creator | Svec Jr., P. | |
dc.creator | Franco García, Victorino | |
dc.date.accessioned | 2016-01-28T08:49:06Z | |
dc.date.available | 2016-01-28T08:49:06Z | |
dc.date.issued | 2012-06-07 | |
dc.identifier.issn | 0021-8979 | es |
dc.identifier.uri | http://hdl.handle.net/11441/33473 | |
dc.description.abstract | 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 degree of disorder. In the second stage of crystallization, i.e., above 923 K, the alloy becomes fully crystalline and a stable, hard magnetic fcc-(FeCo)23B6 type phase was observed as a main boride phase along with soft magnetic a0-FeCo phase and Nb rich non-magnetic phase. Thermo magnetic measurement evidenced re-crystallization process as a considerable decrease in magnetization at the second transformation stage. Simultaneous lowering of the volume fraction of magnetic phases with the formation of non-magnetic phase provides convincing origin for the decrease in magnetization at the second crystallization stage | es |
dc.format | application/pdf | es |
dc.language.iso | eng | es |
dc.publisher | AIP Publishing | es |
dc.relation.ispartof | Journal of Applied Physics, 111, 113518 | es |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.title | Influence of isochronal annealing on the microstructure and magnetic properties of Cu-free HITPERM Fe40.5Co40.5Nb7B12 alloy | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.type.version | info:eu-repo/semantics/publishedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Física de la Materia Condensada | es |
dc.relation.publisherversion | 10.1063/1.4728161 | es |
dc.identifier.doi | http://dx.doi.org/10.1063/1.4728161 | es |
dc.identifier.idus | https://idus.us.es/xmlui/handle/11441/33473 |
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