Abstract
The effect of annealing treatment on melt-spun FeNdB-based multicomponent alloys has been studied by differential scanning calorimetry (DSC), X-ray diffraction and magnetic measurements. Magnetic hardening produced by annealing around 650–700°C results in coercivities Hci of 7–14 kOe. The partial replacement of iron by cobalt plus aluminum results in a high energy product in the as-spun state owing to the fine microstructure. When neodymium is partially replaced by praseodymium (to produce a high coercivity) or when silicon is added, glass formation is enhanced. It has been confirmed that a cost effective (Fe, Co)(Nd, Pr, Mm)(B, Al, Si)-based isotropic permanent magnet, having an energy product (BH)max of 8 MGOe, can be compacted using a simplified die pressing.
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