The Influence of Annealing Temperature on Microstructure and Magnetic Properties of Fe74Co3Si8B10Al1Nb4 Amorphous Alloy Ribbons

  • Shih Fan Chen Institute of Materials Science and Engineering, National Taipei University of Technology, Taipei 106, Taiwan
  • Chih Yuan Chen Department of Energy Engineering, National United University, Miaoli 36003, Taiwan
  • Chien Fan Chiang Institute of Materials Science and Engineering, National Taipei University of Technology, Taipei 106, Taiwan
Keywords: Annealing, Fe-base amorphous alloy, Magnetic property, Nanocrystals, Ribbon

Abstract

Multi-component alloy ribbons with a composition of Fe74Co3Si8B10Al1Nb4 were prepared by a single roller melt-spinning method. The alloy had a fully amorphous structure, as determined by X-ray diffraction. The alloy ribbons were annealed for 10 min at temperatures of 350, 400, 450, 500, 550 and 600 oC, respectively. Differential scanning calorimetry curves indicated that the glass transition temperature (Tg) and the supercooled liquid range (ΔTx) of the amorphous alloy ribbon were about 494 oC and 43 oC, respectively. The ribbons showed soft magnetic properties, with a Curie temperature (Tc) at 284 oC, high saturation magnetization (Ms) of 1.18 T, and coercive force (Hc) of 33.66 A/m. In the present study, both saturation magnetization and coercive force of amorphous alloy ribbons increased with increasing the annealing temperature, due to precipitations and growth of α–Fe phase nanocrystals in the amorphous matrix. On the other hand, it was found that the coercive force of alloy ribbons reduced as a consequence of precipitations of Nb3Si phase if the annealing temperature reached 600 oC.

Published
2017-06-14
Section
ARTICLES