Abstract
An experimental investigation has been conducted of the influence onin-situ eutectic composite microstructures of both gradual and abrupt changes in cross-sectional area, both with and without simultaneous changes in growth direction, and of the effects of changes in growth direction at constant cross-section. Alloys of the binary (Al-Ni and ternary Al-Cu-Ni) eutectic were chosen to eliminate the effects of microsegregation and these were grown under a variety of conditions of growth rate and temperature gradient, consistent with those used for off-eutecticin-situ composites, and in apparatus generally used for that work and described previously. As well as the expected variation in lamellae or inter-rod spacing with changes of cross-section, abrupt decreases in crosssectional growth area coupled with changes in growth direction produced a multigrain structure of various orientations. Potentially weak zones denuded of lamellae or rod growth were observed when the growth direction deviated beyond a limiting small angle at constant cross-section.
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