Recrystallization of unhomogenized aluminium–manganese alloys

Abstract

The recrystallization process in two concentrated aluminium–manganese alloys has been examined in the unhomogenized condition. It is shown that recrystallization nuclei are initially associated with constituent particles originally situated in the as-cast cell walls. After 80% reduction, the constituent particles were still aligned and associated with a particle-free zone. Initial growth of nuclei occurred along these particle-free zones rather than out into the matrix, which contained a large volume fraction of fine precipitate particles. Only when normal grain growth had occurred in the as-cast cell walls to produce large elongated grains could the particle pinning of the matrix be overcome and the high-angle boundaries migrate outwards to consume the remaining matrix.