Effects of Crystal Grain and Grain Boundary Sliding on the Deformation of Polycrystal
Ryoichi KAWAKAMI, Shoji IMATANI and Ryohei MAEDA
Abstract:Polycrystalline materials are composed of great amount of crystal grains, each of which is joined with neighboring grains. Since the slip system of each crystal grain is randomly distributed over the domain, the materials show mechanical inhomogeneity. This paper discusses the effects of grain size, the resistance of crystal grain, as well as the grain boundary sliding on the deformation behavior of polycrystal. Finite element analyses are carried out with reference to the combined model of crystal plasticity and grain boundary sliding. It is shown that both the size and the flow stress parameters are dominant on the inhomogeneity and that the deformation around the grain boundary is relaxed by the grain boundary sliding. Key Words:Crystal plasticity, Grain boundary, Finite element method, Surface roughness, Inhomogeneity, Polycrystal