Effects of grain boundaries on the mechanical behaviour of grains in polycrystals

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Abstract
The effects of grain boundaries on the plasticity of metallic polycrystals loaded at room temperature are studied at two levels, the level of the grain and the level of the aggregate. In the first section, the methods allowing the transition from the local level to the global one are summarized. We lay stress on the necessity to take into account interactions effects between grains. Experimental results about the global behaviour are reported in the section 2. We have restricted the results to the effects of the grain size on the flowstress curve, and to the description of some inhomogeneous slip patterns. The section 3 is based on the experimental observations of grain boundaries and junctions of grains effects on the plastic response of grains of a polycrystal. The formation and evolution of the plastic inhomogeneities are analyzed at the grain level

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