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Abstract
Influence of quenching rate and heat treatment on the magnetic properties of melt-spun Co 82B 2Zr 16 alloy were studied. Large coercive field and energy product are found to occur only over a relatively narrow quenching rate. The annealing temperature dependence of coercive field of the as-quenched samples shows a wide maximum. The highest room-temperature coercive field H c = 3.0 kOe and energy product ( BH) max = 4.5 MGOe are obtained in the sample melt-spun with v s = 26.3 m s −1 after annealing at 520°C for 2 min. X-ray diffraction and thermomagnetic measurements on the samples with high H c and ( BH) max show a two-phase structure with the majority phase Co 5Zr having a Curie temperature T c = 800 K. The hard magnetic properties of the samples are associated with the presence of the Co 5Zr phase.
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