Structure and magnetic properties of spinodal decomposed Cu60Ni20Fe10Co10 ribbons with hard magnetism

Abstract

Abstract The spinodal decomposed Cu-Ni-Fe alloy can possess both hard magnetic properties and excellent plastic toughness, corrosion resistance, and cold workability. Cu60Ni20Fe10Co10 ribbons are prepared by melt-spinning and annealing methods, and their phase composition, microstructure, and magnetic properties are studied. The results show that the as-spun ribbons are composed of equiaxed grains. Through the decomposition of γ\xa0→\xa0γ1\xa0+\xa0γ2 inside the grains, the spinodal structure is formed, which endows the ribbons with the hard-magnetic properties. Also, the maximum coercivity of 679.3\xa0±\xa0149.1 Oe and saturation magnetization of 72.0\xa0±\xa02.7\xa0emu/g are obtained in the ribbons annealed at 435\xa0°C for 30\xa0min and 835\xa0°C for 30\xa0min, respectively. The shape anisotropy of γ1 and γ2, the concentration of Fe, Co, Ni in the γ2 phase, and the content of the α phase are the main factors to determine the magnetic properties. At the same time, the corresponding microstructure evolution models are proposed.