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Molecular Dynamics Simulations of Nanopolycrystals

  • Christian BrandlEmail author
Living reference work entry

Abstract

Nanopolycrystals are polycrystalline metals with an average grain size below 100 nm and exhibit extraordinary strength values. In contrast to the coarse-grained polycrystals, the confinement by grain boundaries of the plastic deformation in the grains approaches limits, where the conventional theories break down. In the grain size regime 10–20 nm, molecular dynamics simulations play a crucial role to elucidate the possible and surprising deformation mechanisms in nanocrystalline metals although the MD method uses assumptions, which ad hoc do not allow for a straightforward extrapolation to experimental conditions. This chapter presents the nanocrystalline-specific methods for MD simulations with their subtleties and summarizes the deformation mechanisms in nanopolycrystals with their signatures on the (experimental) deformation behavior. A comprehensive understanding on the interplay of the deformation mechanisms is suggested in this chapter, which is closed with a list of still-open issues in the field.

Notes

Acknowledgment

The authors wish to acknowledge the financial support by the German Research Foundation (DFG) through grant BR4886/2-1 and the valuable discussions on nanocrystalline materials with Helena Van Swygenhoven, Peter M. Derlet, Steven Van Petegem, Stefan Brandstetter, Ruth Schwaiger, Patric Gruber, and Rainer Birringer.

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© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Institute for Applied Materials (IAM-WBM)Karlsruhe Institute of TechnologyEggenstein-LeopoldshafenGermany

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