Two-dimensional simulation of the effect of the migration of triple junctions on crystallographic texture evolution through grain coarsening

Abstract

A simulation program was developed that belonged essentially to the category of MC Potts methods, but the method also employed a cellular-automata-like character. A 2D grain structure was represented by an array of square cells, and a grain boundary migrated by iteration of occupation events between neighboring pairs of cells. Individual cell pairs were sampled by a systematic random method. The triple junction migration process was explicitly defined. A method to express the ratio of the triple junction mobility to the boundary mobility (mtj/mb) with a simulation parameter was determined by considering tricrystalline specimens. The simulated kinetics for triple junction dragged coarsening coincided essentially with the previously reported results obtained by vertex and statistical models. It was concluded that the crystallographic texture changes through grain coarsening, even when the migration rates of the triple junctions alone depend on combinations of three orientations.