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

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Abstract

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 of crack 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.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Patna, Bihta, Patna, 801106, India

    Surajit Kumar Paul

  2. Division of Materials Engineering, CSIR-National Metallurgical Laboratory, Jamshedpur, 831007, India

    Sunil Kumar & S Tarafder

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  1. Surajit Kumar Paul
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  2. Sunil Kumar
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  3. S Tarafder
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Correspondence to Surajit Kumar Paul.

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Paul, S.K., Kumar, S. & Tarafder, S. Orientation-dependent crack-tip blunting and crack propagation in a single crystal BCC iron. Bull Mater Sci 41, 148 (2018). https://doi.org/10.1007/s12034-018-1661-8

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  • DOI: https://doi.org/10.1007/s12034-018-1661-8

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