Microstructural modeling of transgranular and intergranular fracture in crystalline materials with coincident site lattice grain-boundaries: Σ3 and Σ17b bicrystals

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:661

Article

Wu, Q.¹  Zikry, M. A.¹ 

[1] N Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA

关键词: Coincident site lattice;    Grain boundary;    Dislocation-density;    Transgranular;    Intergranular;    Fracture;   

DOI  :  10.1016/j.msea.2016.02.039

来源: Elsevier

【 摘 要 】

The competing microstructural failure mechanisms of transgranular (TG) and intergranular (IG) fracture, in martensitic steel bicrystals with coincident site lattice (CSL) boundaries of Sigma 3 and Sigma 17b, have been investigated, using a dislocation-density-based crystalline plasticity formulation and a recently developed overlapping fracture method. A dislocation-density grain boundary (GB) interaction scheme was coupled within a dislocation-density based crystal plasticity formulation to investigate how different types of CSL GBs affect dislocation-density evolution, plastic deformation, dislocation pile-up formation, TG and IG fracture, and fracture toughness. The computational predictions indicate that the bicrystal, with a Sigma 3 boundary, transitioned from IG to TG fracture, with large dislocation density generation and plastic deformation on the TG fracture planes. Bicrystals with the Sigma 17b boundary failed due to inter granular fracture and rupture, with much lower, in comparison with the Sigma 3 boundary case, dislocation density generation and plastic deformation. These predictions, which are consistent with experimental observations, indicate that 13 boundary is resistant to IG fracture with a higher fracture toughness than the Sigma 17b boundary case. More significantly, the computational framework can potentially be used as a guideline for GB engineering for failure-resistant materials. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

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