Analysis of Interaction between Dislocation and Grain Boundary by using a Lattice Defect Model

✍ Scribed by Akihiro Nakatani

• Publisher: Elsevier
• Year: 2011
• Tongue: English
• Weight: 870 KB
• Volume: 10
• Category: Article
• ISSN: 1877-7058
• DOI: 10.1016/j.proeng.2011.04.173

✦ Synopsis

For understanding the macroscopic mechanical property of polycrystalline metal from a microscopic point of view, analysis of interaction between grain boundary (GB) and dislocations are very important. Especially, the driving force of each dislocation must be evaluated precisely, to apply the dislocation dynamics method to the plastic deformation analysis. While the driving force for the grain rotation is estimated as the gradient of the function of grain boundary (GB) energy with respect to the misorientation angle, GB-dislocation interactions are very important to understand grain rotation mechanism from a microscopic viewpoint. In this paper, generalized GB energy of GB-dislocation system is evaluated by using the extended finite element method with solving the problem of dislocationdisclination system. First, the comparison between the results of disclination model and atomistic model is discussed. Then, the strain energy of the GB-dislocation system is studied to evaluate the driving force of the dislocation motion.