Investigation on the Effects of Grain Boundary on Deformation Behavior of Bicrystalline Pillar by Crystal Plasticity Finite Element Method

Hui Zhou,Shanping Lu,Pei Wang

doi:10.3390/cryst11080923

Hui Zhou, Shanping Lu + Show 1 more

Open Access

https://doi.org/10.3390/cryst11080923

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Journal: Crystals	Publication Date: Aug 9, 2021
Citations: 3	License type: CC BY 4.0

Affiliation: Chinese Academy of Sciences

Abstract

A dislocation density–grain boundary interaction scheme coupled with the dislocation density-based crystalline plasticity finite element method has been established and used to investigate the deformation behavior of bicrystalline pillars with the same grain boundary misorientation angle but different crystal orientations. It is found that the angle between the activated slip systems, which is determined by the crystal orientations, rather than the grain boundary misorientation angle, influences the interactions between the plastic slip and the grain boundary, which further influence the heterogeneous deformation of bicrystalline specimens.

Highlights

Grain boundaries (GBs) have significant influence on the mechanical properties of polycrystalline materials by interacting with dislocations and other defects [1,2,3]
Thereafter, the accuracy of material parameters and dislocation density–grain boundarydensity–grain interaction (DDGBI) model were verified by simulating the deformation of specimen BC1 first
The similar phenomenon is observed from the reverse side (Figure 1d). Those phenomena are consistent with the distribution of slip bands in experiments reported in [19]. Those results suggest that the DDGBI scheme and the material coefficients can be used to study the heterogeneous deformation of bicrystals

Summary

Introduction

Grain boundaries (GBs) have significant influence on the mechanical properties of polycrystalline materials by interacting with dislocations and other defects [1,2,3]. Raabe and Lu et al [14,23] have employed phenomenological crystal plasticity models to qualitatively analyze the effects of GB misorientation angle on the local plastic deformation of bicrystals and found the blocking effect of GBs on plastic strain. Have revealed that the plastic slips between theplastic component crystals the influence the pile-up dislocations at GBs of dislocations different slips between component crystalsofinfluence the pile-up in bicrystalline at specimens [24]. This implies that to understand the effects of GBs on the GBs in bicrystalline specimens [24].

Crystal Plasticity Simulation Model

Results

Conclusions