Effect of chemical composition and Cu addition on crystallization and magnetic characteristics of FeZrB alloys

摘要

Amorphous alloy ribbons of FeZrB and FeZrBCu (1 at.% Cu) are synthesized and annealed in vacuum. Synergistic effects of the addition of Cu, and different proportions of Fe, Zr and B, on both crystallization and magnetic property of FeZrB alloys, are systematically investigated. The addition of Cu results in a lower thermal stability of FeZrBCu alloys compared to FeZrB alloys, while the heat treatment interval of FeZrBCu alloys is wider. The crystallizations of FeZrB alloys differ from each other; in contrast, those of FeZrBCu alloys are similar. The coercivity (H-c) is large for FeZrB alloys in general, but small for FeZrBCu alloys at the initial annealing stage due to the nanocrystalline structure in the two-phases and the fine alpha-Fe nanocrystals. All developed FeZrBCu alloys demonstrate low values of H-c and excellent thermal stability of H-c below 898 K. The correlated mechanisms linking crystallization and magnetic characteristics are discussed in detail. (C) 2020 Elsevier B.V. All rights reserved.