Starink, M.J. and Zahra, A.-M.
Precipitation in a high silicon Al-Si alloy studied by isothermal calorimetry
Materials Science and Engineering: A, 241, (1-2), . (doi:10.1016/S0921-5093(97)00460-7).
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The precipitation in an Al–6mass%Si alloy was investigated by isothermal calorimetry. Three types of heat treatment were studied and precipitation rates in the samples increase in the order: Furnace cooled, ice-water quenched (IWQ) and naturally aged after IWQ. With the aid of a novel model for nucleation and growth reactions the measured exothermic heat flow is interpreted in terms of two processes: Growth of large undissolved Si particles and growth of pre-existing nuclei. The activation energies for precipitation are EA=0.89 eV for IWQ samples and EA=0.94 eV for furnace cooled samples.
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