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Phase field simulations of coarsening of Al6Mn precipitates located on grain boundaries in Al-Mn alloys

In-situ observations show that grain boundary movement during recrystallization in Al alloys is not smooth but jerky on a microscopic scale. There is experimental and theoretical evidence [1] that the jerky motion is primarily due to the pinning effect and consecutive coarsening of small precipitates. An experimental micrograph of a pinned recrystallization front is shown in figure 1. The precipitates are unfortunately too small to study the pinning and unpinning mechanisms in detail from in-situ observations. An analytical solution of the temporal evolution of the grain boundary precipitate size distribution has been established assuming a uniform distribution of the precipitates along the grain boundaries [2]. Jerky motion however is controlled by local coarsening of a limited number of precipitates, for which this analytical solution cannot be applied.