A low-angle grain boundary is a dislocation wall characterized by a large spacing between dislocations, a specific type of defect that generates a process zone influencing the boundary’s behavior. Near a phase transformation, the low-angle grain boundary forms a chain of highly localized process zones, each centered at a dislocation within the wall. These zones differ structurally from those at isolated dislocations. The order parameter’s dependence on the parameter a (and thus on the temperature T) is pronounced near the bifurcation point and grows significantly beyond it. Unlike the behavior seen with isolated dislocations, this increase corresponds to a rapid growth in the order parameter’s peak height with a negligible increase in its lateral size. The free energy of the zone chain exhibits a dependence of \(F\sim (a_{d}-a)^{2}\) (Boulbitch and Korzhenevskii, First presented here.)