Soft Magnetic Properties of Nanocrystalline Fe–Co–B–Si–Nb–Cu Alloys in Ribbon and Bulk Forms
- 1 December 2003
- journal article
- Published by Springer Science and Business Media LLC in Journal of Materials Research
- Vol. 18 (12), 2799-2806
- https://doi.org/10.1557/jmr.2003.0390
Abstract
Ribbon and bulk nanocrystalline body-centered-cubic (bcc) (Fe,Co) alloys exhibiting good soft magnetic properties were synthesized in Fe71.5-xCoxB13.5Si10Nb4Cu1 system by the simple production processes of melt-spinning or casting and annealing. The glass-type alloys were formed in the Co content range below 30 at.%. These glassy alloys crystallized through two exothermic reactions. The first stage was due to the precipitation of nanoscale bcc-(Fe,Co) phase with a grain size of about 10 nm, and the second stage resulted from the decomposition of the remaining amorphous phase to α–(Fe,Co), (Fe,Co)2B, (Fe,Co)23B6, (Fe,Co)3Si, and (Fe,Co)2Nb phases. The glass transition temperature increased from 820 to 827 K with increasing Co content from 5 to 20 at.%, while the supercooled liquid region decreased slightly from 37 to 30 K because of the nearly constant crystallization temperature. By choosing the 10 at.% Co-containing alloy, we produced cylindrical glassy alloy rods 1.0 and 1.5 mm in diameter by copper mold casting. The subsequent annealing for 300 s at 883 K corresponding to the temperature just above the first exothermic peak caused the formation of nanoscale bcc-(Fe,Co) structure. The bcc-(Fe,Co) alloy rods exhibited good soft magnetic properties of 1.26 T for saturation magnetization and 5.0 A/m for coercive force, which were comparable to those for the corresponding bcc-(Fe,Co) alloy ribbon. The nanocrystalline alloy in a bulk form is encouraging for future use as a new type of soft magnetic material that requires three-dimensional shapes.Keywords
This publication has 26 references indexed in Scilit:
- Formation of Bulk Glassy Fe75–x–yCrxMoyC15B10 Alloys and Their Corrosion BehaviorJournal of Materials Research, 2002
- Synthesis of Fe–Cr–Mo–C–B–P bulk metallic glasses with high corrosion resistanceActa Materialia, 2002
- Small-angle neutron scattering and differential scanning calorimetry studies on the copper clustering stage of Fe–Si–B–Nb–Cu nanocrystalline alloysActa Materialia, 2000
- Bulk Amorphous Fe–Ga–P–B–C Alloys with a Large Supercooled Liquid RegionMaterials Transactions, JIM, 2000
- Bulk Glassy Fe–Co–Ga–P–C–B Alloys with High Glass-Forming Ability, High Saturation Magnetization and Good Soft Magnetic PropertiesMaterials Transactions, JIM, 2000
- Bulk ferromagnetic glasses prepared by flux melting and water quenchingApplied Physics Letters, 1999
- Magnetic properties of HITPERM (Fe, Co)88Zr7B4Cu1 magnetsJournal of Applied Physics, 1999
- Fe-based soft magnetic amorphous alloys with a wide supercooled liquid regionJournal of Applied Physics, 1999
- Applications of nanocrystalline soft magnetic Fe-M-B (M=Zr, Nb) alloys "NANOPERM(R)"IEEE Transactions on Magnetics, 1997
- Effect of Additional Elements (M) on the Thermal Stability of Supercooled Liquid in Fe72−xAl5Ga2P11C6B4Mx Glassy AlloysMaterials Transactions, JIM, 1996