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melting point results in a break-up and spheroidization of the iron rods together with diffusion of iron to the surface and grain boundaries of specimens. The driving force for these processes is a tendency by the system to minimize its interfacial energy. The spheroidizing of iron rods as a means of decreasing the interracial energy, is aided by the absence of preferred crystallographic orientations. The eutectic is considerably more thermally unstable than both the A1-CuA12 and A1-A13Ni eutectic possibly because of: a) its higher interfacial energy, and b) the higher heat treatment temperatures used.The stability of the eutectic structures was found to be a function of: a) time and temperature of heat treatment, b) interrod spacings, and c) oxygen content of the alloys. Point a) affects the diffusion characteristics of the system, whereas b) and c) affect the initial interracial energy of the system.

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