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Simulation of cyclic deformation of bicrystals: Effects of orientation and deformation properties of constituent grains
Authors:Wang Mingzhang  Lin Shi  Li Chenghua  Wang Zhongguang and Xiao Jimei
Institution:(1) Department of Materials Physics, University of Science and Technology Beijing, 100083 Beijing, China;(2) State Key Laboratory for Fatigue and Fracture of Materials, Institue of Metal Research, Academia Sinica, 110015 Shenyang, China
Abstract:The cyclic deformation of aluminium bicrystals was numerically simulated by using a crystalline micromechanical approach to study the effects of crystallographic orientation and deformation properties of constituent grains. Both the macro-and micro-stress-strain responses were analyzed. It was shown that the whole Bauschinger effect and cyclic hardening behavior of bicrystals is primarily controlled by the corresponding properties of the constituent grains, and that the effects of internal stresses induced by the grain boundary and the interaction between grains are secondary. The crystallographic orientation of constituent grains was also shown to have significant influence on the macro-and micro-mechanical behavior of the bicrystals. There were smaller symmetry in the orientation or greater difference in the strength between grains and more remarkable GB effects.
Keywords:cyclic deformation  grain boundary  crystallographic orientation  bicrystal  crystalline micromechanics
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