Abstract
A deviation from the interrod spacing (λ) and growth velocity (V) relation λ2V = constant, anticipated for diffusion-only rod eutectic growth, has been observed at growth velocities ≺5 cm/h (14 µm/s) in directionally solidified eutectic Bi-Mn (Bi/MnBi). At lower growth velocities,V≺ 0.5 cm/h, a breakdown in the aligned rod eutectic, cooperative growth mechanism, has also been noted. The λ2V relation has been experimentally determined over a range of furnace (growth) velocities (0.5 ≤V ≤ 50 cm/h), thermal gradients in the liquid (40 ≤ GL ≤ 120 °C/cm) and solidification orientation with respect to the direction of gravity (parallel, antiparallel, and perpendicular). Naturally induced, convective instabilities are suggested as a possible, lower growth velocity limit for cooperative growth in this system.
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