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- Title
Annealing Optimization of High Induction (> 1.7 T) Fe<sub>85−(x+y)</sub>Co<sub>x</sub>Cu<sub>y</sub>B<sub>15</sub> Alloys With Enhanced Magnetic Properties.
- Authors
Warski, Tymon; Pilśniak, Adam; Wójcik, Anna; Szlezynger, Maciej; Dadiel, Joseph Longji; Kolano-Burian, Aleksandra; Hawełek, Łukasz
- Abstract
In this work, the influence of the substitution of Co and Cu for Fe on the thermal stability, crystallization process, crystal structure and magnetic properties of Fe85−(x+y)CoxCuyB15 (x = 2.5, 5, 7.5; y = 0.6, 1.2) as-quenched alloys in the form of the ribbons have been studied. Thermal analysis showed that the average activation energy of the α-Fe phase crystallization decreases from 216.1 to 168.6 kJ/mol for Fe84.4−xCoxCu0.6B15 and increases from 157 to 208.4 kJ/mol for Fe84.8−xCoxCu1.2B15. The relationship between the annealing temperature (260 °C to 440 °C for 20 minutes in vacuum) and magnetic properties (saturation induction, coercivity and core power losses) was determined for isothermally vacuum-annealed. The optimal annealing conditions corresponding to the minimum value of power core losses were found for temperatures between 300 °C and 330 °C. Optimally vacuum-annealed alloys are characterized by high saturation induction of 1.67 to 1.78 T, a relatively low coercivity of 14.7 to 26.4 A/m, core power losses at 1 T/50 Hz of 0.21 to 0.39 W/kg and magnetic permeability μ′ up to 250 to 967. The X-ray diffraction was used to monitor the crystal structure evolution during annealing. It confirmed the occurrence of three stages: glass relaxation, early α-Fe(Co) crystallization stage for the minimum value of core power losses and extensive two-phase crystal growth stage with high saturation induction and deteriorated coercivity and core power losses. Transmission electron microscopy examination verified that optimally annealed alloy was the composite nanomaterial built of α-Fe(Co) nanocrystals immersed in an amorphous matrix.
- Subjects
MAGNETIC alloys; MAGNETIC properties; MAGNETIC permeability; CRYSTAL growth; COPPER; GLASS-ceramics
- Publication
Metallurgical & Materials Transactions. Part A, 2024, Vol 55, Issue 4, p1174
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-024-07313-y