Abstract
The solute distributions at the solid-liquid interface during steady-state directional solidification of two contrasting peritectic systems were examined in detail by electron probe microanalysis. In the Al-Al3Ti system the peritectic transformation plays a negligible part in the solidification reaction whereas in the Cd-Cd3Ag system the peritectic transformation dominates. Knowing this, the solid-liquid interface profile during solidification can be predicted with reasonable accuracy on the assumption of equilibrium at all points on the solid-liquid interface. In the Cd-Cd3Ag system the composition of the peritectic product is rapidly equilibrated by solid-state diffusion. A diffusion coefficient is estimated.
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