Abstract
Hypoeutectic Al-Si alloys were directionally solidified under conditions of steady-state growth. Cross-sectional views of the microstructure, i.e., perpendicular to the growth direction, were examined and measurements of the primary dendrite trunk diameters made. The results are presented as functions of growth velocity, composition, and temperature gradient, and evaluated in terms of relevant theory. It is suggested that the primary dendrite trunk diameter is a reliable, or better, a measure of the local solidification conditions during constrained growth than either the conventionally accepted eutectic ( λ E) or primary dendrite arm (λ 1) spacing.
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