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Controlling Plastic Flow across Grain Boundaries in a Continuum Model

  • Symposium: Structural Transitions and Local Deformation Processes at and near Grain Boundaries
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Abstract

A framework for modeling controlled plastic flow through grain boundaries using a continuum plasticity theory, phenomenological mesoscopic field dislocation mechanics (PMFDM), is presented in this article. The developed tool is used to analyze the effect of different classes of constraints to plastic flow through grain boundaries, as it relates to dislocation microstructure development and mechanical response of a bicrystal. It is found that in the case of low misorientation angle between adjacent grains, impenetrable grain boundaries cause significant work hardening as compared to penetrable grain boundaries due to the accumulation of excess dislocations along them. However, a penetrable grain boundary with a high misorientation angle effectively behaves as an impenetrable boundary, with respect to the stress-strain response.

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Acknowledgments

Financial support for SP from the National Science Foundation (Grant No. DMI-0423304) and the Dowd-ICES Fellowship is gratefully acknowledged. Support for AA and ADR from the MRSEC at CMU (NSF Grant No. DMR-0520425) is gratefully acknowledged. Discussions with members of the MRSEC at CMU (NSF Grant No. DMR-0520425) are gratefully acknowledged.

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Authors and Affiliations

  1. Department of Mechanical Engineering, California Institute of Technology, Pasadena, CA, 91101, USA

    Saurabh Puri (Postdoctoral Scholar)

  2. Department of Civil and Environmental Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213, USA

    Amit Acharya (Professor)

  3. Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, PA, 15213, USA

    Anthony D. Rollett (Professor)

Authors
  1. Saurabh Puri
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  2. Amit Acharya
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  3. Anthony D. Rollett
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Corresponding author

Correspondence to Saurabh Puri.

Additional information

Manuscript submitted December 16, 2009.

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Puri, S., Acharya, A. & Rollett, A.D. Controlling Plastic Flow across Grain Boundaries in a Continuum Model. Metall Mater Trans A 42, 669–675 (2011). https://doi.org/10.1007/s11661-010-0257-8

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  • DOI: https://doi.org/10.1007/s11661-010-0257-8

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