Abstract
An MRE2(Fe,Co)14B alloy with Zr substitution and TiC addition was systematically studied. It was found by means of X-ray diffraction, transmission electron microscopy (TEM) and magnetic measurements that the combination of Zr substitution and TiC addition yields adequate microstructural control in both gas atomization (GA) and melt spinning (MS) techniques. For MS ribbons, an Hcj of 11.7kOe and (BH)max of 11.9MGOe at 27°C were obtained in the ribbons spun at 16m∕s and annealed at 700°C for 15min. For GA powders, an Hcj of 9.1kOe and (BH)max of 9.2MGOe at 27°C were obtained in 20–25μm GA powder annealed at 700°C for 15min. The temperature coefficients of Br and Hcj are 0.06 and 0.36%∕°C for the MS ribbon and 0.09 and 0.4%∕°C for the GA powder in the temperature range of 27–100°C, respectively. TEM images revealed that the MS ribbon consists of a fine and uniform microstructure with an average size of 30nm, while the GA spherical powder consists of an interior coarsened microstructure with a grain size of 80nm and a rim area with a grain size of 10nm.
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