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Effect of interface structure on dislocation glide behavior in nanolaminates

  • Invited Paper
  • Focus Issue: Multiscale Materials Modeling of Interface-mediated Thermomechanical Behavior
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Abstract

The ultra-high strength of nanolaminates arises from the effect of the fine layering on dislocation motion. Using atomistic simulations, we investigate the effect of the interface structure on the behavior of an edge dislocation driven to glide within a nanolayer of a nanolaminate. Three classes of interface structures are studied, including Cu/Nb or Cu/Cu incoherent interfaces and Nb/Nb coherent interface. Glide behavior is jerky when the interface is incoherent and composed of discrete misfit dislocation arrays. The resistance to glide is non-uniform among parallel glide planes, where planes with intersection lines coinciding with misfit dislocation lines experience greater resistances than those that do not. Interfaces containing misfit dislocations, which extend from the interface into a glide plane in the layer, severely obstruct glide, causing the dislocation to transfer to a parallel plane. Coherent interfaces, while posing the least resistance to initiate and promote smooth glide, lead to strain hardening.

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All data generated or analyzed during this study are included in this published article and its supplementary materials.

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Acknowledgments

W. J. and I. J. B. would like to acknowledge funding from the Office of Naval Research under Grant No. N000141712810. Use was made of computational facilities purchased with funds from the National Science Foundation (CNS-1725797) and administered by the Center for Scientific Computing (CSC). The CSC is supported by the CNSI and the Materials Research Science and Engineering Center (MRSEC; NSF DMR 1720256) at UC Santa Barbara.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of California, Santa Barbara, CA, 93106-5070, USA

    Wu-Rong Jian, Shuozhi Xu & Irene J. Beyerlein

  2. Department of Mechanical and Aerospace Engineering, Utah State University, Logan, UT, 84322-4130, USA

    Yanqing Su

  3. Department of Materials Science and Engineering, University of California, Berkeley, CA, 94720-1760, USA

    Weisen Ji

  4. Materials Department, University of California, Santa Barbara, CA, 93106-5050, USA

    Irene J. Beyerlein

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Irene J. Beyerlein was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/editor-manuscripts/.

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Jian, WR., Su, Y., Xu, S. et al. Effect of interface structure on dislocation glide behavior in nanolaminates. Journal of Materials Research 36, 2802–2815 (2021). https://doi.org/10.1557/s43578-021-00261-y

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