Abstract
A systematic study of the solidification structures of Fe-(20–47)at.%Al melt-spun ribbons was performed. Ribbons 12mm wide ranging from 15 to 240 μm in thickness were produced under reproducible process conditions. Size and morphology of the grains and dendrites were correlated with ribbon thickness and aluminium content. Grain size and primary dendrite spacing were independent of the aluminium content for ribbons more than 70 μm thick. For thinner ribbons, the grain size and the diameter of the primary dendrites increase with increasing aluminium concentration. Preferential dendritic solidification has been observed at higher aluminium concentration and with increasing ribbon thickness. High melt superheats resulted in a decreased grain size of the ribbons. This effect can be correlated to a more efficient cooling owing to improved wetting behaviour between ribbon and wheel surface.
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