Abstract
FeNdB alloys of three different boron contents were rapidly solidified to an overquenched (amorphous) state by chill block melt spinning. The structure of the ribbons in the as-cast state and after isothermal and dynamic annealing in a differential scanning calorimeter were investigated by X-ray diffraction and transmission electron microscopy. The changes in Curie temperature were monitored by DSC. Evidence was obtained for the formation of an intermediate metastable phase during the transformation from the amorphous to the hard magnetic Fe 14Nd 2B phase. The mechanism of microstructure development is briefly discussed in relation to the alloy composition, notably boron content and metastable phase equilibria. The Curie temperature was found to vary during the course of the transformation in dynamic annealing suggesting structural changes within the complex tetragonal unit cell as temperature is increased. The effect was found to vary with the overall boron concentration in the alloy and the results are discussed. The mechanism of crystallization of amorphous FeNdB alloy ribbons is a function of composition.
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