Microstructural characterisation of gas atomised Fe73.5Si13.5B9Nb3Cu1 and Fe97Si3 alloys
2011
García Escorial, Asunción | Lieblich, Marcela | López Valero, Manuela | Marín, P.
Powder particles of Fe73.5Si13.5B9Nb3Cu1 and Fe97Si3 soft magnetic alloys have been prepared by gas atomization. The gas atomized powder was microstructurally characterized and the dependence of coercivity with the composition and powder particle size investigated. As-atomized powder particles of both compositions were constituted by a bcc α-Fe (Si) solid solution. The Fe73.5Si13.5B9Nb3Cu1 powder particles presented a grain microstructure with dendrite structure, which dendrite arms were enriched in Nb. The coercivity increased as the particle size decreased, with a minimum coercivity, of 5 Oe, measured in the Fe97Si3 alloy in the range of 50–100 μm powder particle size. The coercive fields were quite higher in the Fe73.5Si13.5B9Nb3Cu1 than in the Fe97Si3 powder, due to the Nb addition, which produced a phase segregation that leads to a noticeable magnetic hardening.
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