Effect of grain boundary on bicrystal ingrain non-uniform deformation by crystal plasticity finite element

摘要

The effect of grain boundary on ingrain micro non-uniform plasticity deformation plays annimportant role in many attractive scientific areas, such as size effect of microforming, specialnproperties of nanocrystalline and ultrafine grained metals. Many micromechanical models hadnbeen developed in the past decade to characterise such effect by importing some specialnconcepts and variables, such as geometrical necessary dislocation and strain gradient, but fornthe complexity it is still under development. In this paper, to enhance the calculation efficient andnalso to consider the characteristics of micromaterials, crystal plasticity finite element simulationnwas used to discuss bicrystal ingrain non-uniform plasticity deformation. Two cubic columnarncopper grains with the combination of three typical orientations were deformed up to 15% underntension. Then the effects of misorientation and grain boundary on the non-uniform ingrainndeformation in the centre and the region near the grain boundary were compared and discussednin detail. It is shown that orientation, misorientation and grain boundary influence ingrainninhomogeneous plasticity deformation greatly.