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Lattice dislocation induced misfit dislocation evolution in semi-coherent {111} bimetal interfaces

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

The study of dislocation plasticity mediated by semi-coherent interfaces can aid in the design of certain heterostructured materials, such as nanolaminates. The evolution of interface misfit patterns under complex stress fields arising from dislocation pileups can influence local dislocation/interface interactions, including effects of multiple incoming dislocations. This work utilizes the Concurrent Atomistic-Continuum modeling framework to probe the evolution of misfit structures at semi-coherent Ni/Cu and Cu/Ag interfaces im**ed by dislocation pileups generated via nanoindentation. A continuum microrotation metric is computed at various stages of the indentation process and used to visualize the evolution of the interface misfit dislocation pattern. The stress state from approaching dislocations induces mixed contraction and expansion of misfit dislocation structures at the interface. A lower number of misfit nodes per unit interface area coincides with greater localized deformation with regard to atoms near misfit nodes for Ni/Cu. The decreased misfit node spacing for Cu/Ag alternatively distributes the restructuring associated with plastic deformation over a larger percentage of atoms at the interface. Interface sliding facilitated by misfit dislocation motion is found to facilitate deformation extending into the bulk lattices centered on misfit nodes. The depth of penetration of those fields is found to be greater for Ni/Cu than for Cu/Ag.

Graphic abstract

The study of dislocation plasticity mediated by semi-coherent interfaces can aid in the design of certain heterostructured materials, such as nanolaminates. The evolution of interface misfit patterns under complex stress fields arising from dislocation pileups can influence local dislocation/interface interactions, including effects of multiple incoming dislocations. This work utilizes the Concurrent Atomistic-Continuum modeling framework to probe the evolution of misfit structures at semi-coherent Ni/Cu and Cu/Ag interfaces im**ed by dislocation pileups generated via nanoindentation. A continuum microrotation metric is computed at various stages of the indentation process and used to visualize the evolution of the interface misfit dislocation pattern. The stress state from approaching dislocations induces mixed contraction and expansion of misfit dislocation structures at the interface. A lower number of misfit nodes per unit interface area coincides with greater localized deformation with regard to atoms near misfit nodes for Ni/Cu. The decreased misfit node spacing for Cu/Ag alternatively distributes the restructuring associated with plastic deformation over a larger percentage of atoms at the interface. Interface sliding facilitated by misfit dislocation motion is found to facilitate deformation extending into the bulk lattices centered on misfit nodes. The depth of penetration of those fields is found to be greater for Ni/Cu than for Cu/Ag.

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Acknowledgments

This work is based on research supported by the National Science Foundation under the Grants CMMI-1761553 and CMMI-1761512. All presented simulations were conducted using XSEDE resources under allocation TG-MSS150010.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    Alex Selimov & David McDowell

  2. Department of Mechanical Engineering, University of California, Santa Barbara, CA, 93106, USA

    Shuozhi Xu

  3. Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, 32611, USA

    You** Chen

  4. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    David McDowell

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  1. Alex Selimov
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Correspondence to Alex Selimov.

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David McDowell 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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Selimov, A., Xu, S., Chen, Y. et al. Lattice dislocation induced misfit dislocation evolution in semi-coherent {111} bimetal interfaces. Journal of Materials Research 36, 2763–2778 (2021). https://doi.org/10.1557/s43578-021-00184-8

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