Abstract
Cast-in crystals were observed in amorphous alloy ribbons of CoB, FeB, NiB, (Fe,Ni)B and (Fe,Co)B prepared by the chill-blockcasting technique. Their presence was determined by optical microscopy, microradiography, X-ray diffraction, scanning and transmission electron microscopies and Bitter and Kerr domain observation techniques. The cast-in crystals are often very large, indicating growth velocities greater than 1 cm s −1 and growth temperatures greater than 1000 °C. Most of the crystals are of the expected stable phase but in the FeB series the cast-in crystals are of the metastable body-centered tetragonal Fe 3B phase.
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