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- W1497137171 abstract "Deformation of a grain in polycrystalline metals is restricted or forced by deformation of neighbor grains during plastic deformation processes. It also gives influence to deformation of neighbor grains at the same time. Interaction between grains causes inhomogeneous local deformation and texture during plastic deformation. Prediction of inhomogeneous local deformation and texture is important in understanding of recrystallization texture. Taylor-type polycrystal models which have been employed in prediction of texture evolution can not count on grain interaction. In this work, a finite element simulation based on the crystal plasticity has been carried out to investigate the effect of grain interaction on local deformation and texture evolution. An artificially configured BCC bicrystal that consists of a crystal located at center and a surrounding neighbor crystal has been employed in plane strain compression simulation. Several pairs of specific orientations have been chosen for initial orientations of the bicrystal. Deformation and texture evolution of the center crystal in the bicrystal have been investigated changing the initial orientation of the surrounding crystal. The simulation results show that deformation and texture evolution near crystal boundary can be different from those at the center region of the crystal. Orientation fragmentation, which results in great lattice curvature is observed in a center grain with an initial metastable orientation. Simulation shows that a metastable crystal always breaks up during deformation and the grain interaction changes only the pattern of grain breakup. Park, Han, Oh, Raabe, Kim Crystal plasticity FEM Raabe, edoc Server, Max-Planck-Society 2 MPI Dusseldorf Introduction Heterogeneities in structure, stress and strain occur when polycrystalline metals undergo deformation. The heterogeneities in structure can be classified into heterogeneities within a grain and those involving several grains [1]. An important heterogeneity evolves when a grain is divided into zones of different crystallographic orientations. The divided grain usually shows banded structure that consists of mutually misoriented deformation bands separated by transition bands. The transition bands have sharp lattice curvature and high geometrically necessary dislocation density. An experimental measurement of the misorientation across a transition band showed a deviation of 30° over a distance of only 3μm [2]. These transition bands have been shown to be favoured sites for nucleation in recrystallization [3]. Transition bands are usually observed in grains with metastable orientations, such as cube components (001)[100] in FCC metals [4,5]. Strain heterogeneity within a grain of a polycrystal can also arise from the influence exercised by neighboring grains. Therefore evolution of heterogeneities in a grain during deformation could be a function of orientation of itself and orientations of neighboring grains. It has not been clear what is the main factor to give rise to orientation fragmentation. This work has been carried out to investigate the effects of grain interaction on orientation fragmentation tendency in BCC metals with selected sets of orientations. Crystal Constitutive Model for the FE Simulations The deformation behaviour of grains is determined by a crystal plasticity model that accounts for plastic deformation by crystallographic slip and for the rotation of the crystal lattice during deformation. The crystal kinematics follows those described by Asaro [6]. In this work, we used an implicit time-integration procedure for a crystal constitutive equation proposed by Kalidindi et al. [7]. The constitutive equation for the stress in each crystal is taken as *] [ * E E C = σ , (1)" @default.
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- W1497137171 date "2003-01-01" @default.
- W1497137171 modified "2023-10-03" @default.
- W1497137171 title "Crystal Plasticity Finite Element Simulations of Grain Interaction and Orientation Fragmentation during Plastic Deformation of BCC Metals" @default.
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