Abstract
Interface stability calculations are presented for two classes of lamellar eutectic; (a) those in which facets on the interface of one phase impede smooth changes in the ratio of the lamellar widths (e.g. Bi-based systems like Bi-Pb) and (b) metal-like systems where there are no facets. It is shown that the former are unstable to disturbances of wavelengths of the order of that of the cellular structure in single-phase materials (giving rise to the complex-regular structure). The latter are unstable to disturbances of wavelength of the order of the lamellar spacing when they are grown under certain conditions from melts of non-eutectic composition. The results obtained are compared with the experimental findings of Mollard and Flemings [Trans. AIME 239 (1967) 1526, 1534] on the breakdown of the Pb-Sn system.
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