Abstract
The Mg-Al-Zn alloy AZ91 is age hardenable, forming precipitates of –Mg17Al12 after suitable heat treatment. In this alloy both continuous and discontinuous precipitation canoccur. These modes are in competition and lead to very different microstructures. In this paper,a new model is developed to predict this competitive precipitation. The model is validated usingliterature data and then used to study the competition between precipitation modes and predictthe effect of cooling rate from solution treatment on the microstructure expected in AZ91.
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