Orientation-dependent crack-tip blunting and crack propagation in a single crystal BCC iron

Bulletin of Materials Science

SURAJIT KUMAR PAUL^1¹  SUNIL KUMAR^2² 

[1] Department of Mechanical Engineering, Indian Institute of Technology Patna, Bihta, Patna 801106, India^1;Division of Materials Engineering, CSIR-National Metallurgical Laboratory, Jamshedpur 831007, India^2

关键词: Crack propagation;    crack-tip blunting;    molecular dynamics;    crystal orientation;    BCC iron.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Atomistic simulations of cracks with four different orientations in body-centered cubic single crystal iron are presented using molecular dynamics. Crystal orientation has considerable effect on the activation and evolution ofcrack propagation mechanisms. The results reveal that (a) crack-tip blunting depends on the crystallographic orientation, (b) continuous generation of dislocations form crack tip occurs for large crack-tip blunting, and (c) absence of deformation activities like dislocation generation, twin formation, etc. at the crack tip results in crack propagation in a brittle manner.

【 授权许可】

CC BY