Abstract
A measurement of the axial G A and radial G R temperature gradients in molten Al-Zn and Pb-Sn eutectics in a cylindrical graphite ampoule enabled a prediction of the isotherms in the melt and consequently of the geometry of the solid/liquid interface during solidification of melts into stable or unstable vertical Bridgman (VB) arrangement. For a stable VB arrangement, with stable symmetric laminar flow, the interface is concave ; for an unstable VB arrangement with non-symmetric flow pattern it is S-shaped. This has been confirmed by metallography. The value of G R increases with an increasing value of G A and above all with increasing convection. The curvature of the interface increases with the growth rate of the specimen.
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