Before revision: A precipitate-free zone (PFZ) refers to a localized region around the grain boundary that is free of precipitates, and is a common phenomenon that arises in polycrystalline materials where heterogeneous nucleation of precipitates (A secondary phase or surface where precipitates first form) is the dominant nucleation mechanism.
After revision: (Crystalline materials with stochastically oriented grains)A precipitate-free zone (PFZ) refers to a localized region around the grain boundary that is free of precipitates, and is a common phenomenon that arises in polycrystalline materials where heterogeneous nucleation of precipitates (A secondary phase or surface where precipitates first form) is the dominant nucleation mechanism.