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A multi-phase field model is employed to study the microstructural evolutionof an alloy undergoing liquid dealloying. The model proposed extends upon theoriginal approach of Geslin et al. to consider dealloying in the presence ofgrain boundaries. The model is implemented using a semi-implicit time steppingalgorithm using spectral methods, which enables simulating large 2D and 3Ddomains over long time-scales while still maintaining a realistic interfacialthickness. The model is exercised to demonstrate a mechanism of coupledgrain-boundary migration to maintain equilibrium contact angles with thistopologically-complex solid-liquid interface during dealloying. This mechanismlocally accelerates dealloying by dissolving the less noble alloy metal from(and rejecting the more noble metal into) the migrating grain boundary, therebyenhancing the diffusion-coupled-growth of the liquid channel into theprecursor. The deeper corrosion channel at the migrating grain boundaryasymmetrically disrupts the ligament connectivity of the final dealloyedstructure, in qualitative agreement with published experimental observations.It is shown that these grain boundary migration-assisted corrosion channelsform even for precursors with small amounts of the dissolving alloy species,below the so-called \textit{parting limit}

Grain Boundary Effects in Dealloying Metals: A Multi-Phase Field Study