THE PLASTICITY OF PARTICLE-CONTAINING POLYCRYSTALS

The lattice misorientations adjacent to second-phase particles of silicon in a polycrystalline aluminium matrix deformed in compression have been measured by a TEM microtexture technique. The results have been analyzed in terms of a simple model which is based on a modification of Taylor's polycrystalline plasticity theory. A model in which independent deformation zones are formed in the vicinity of each particle for each active slip system, gives reasonable agreement with the experiments if overlap of the deformation zones is taken into account. The number of deformation zones formed at a particle and the size of the misorientation are found to be functions of particle size as well as strain. © 1990.