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Precipitation reactions occur in many different alloy systems when one phase transforms into a mixed-phase system as a result of cooling from high temperatures. This article discusses the homogenous and heterogeneous nucleation and growth of coherent and semicoherent precipitates. It describes two precipitation modes, namely, general or continuous precipitation and cellular or discontinuous precipitation. The article also provides information on the precipitation sequences in aluminum alloys.

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Mario Epler, Structures by Precipitation from Solid Solution, Metallography and Microstructures, Vol 9, ASM Handbook, Edited By George F. Vander Voort, ASM International, 2004, p 134–139,

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