Abstract
Large-scale molecular dynamics (MD) simulations are used to understand the macroscopic yield behavior of nanocrystalline Cu with an average grain size of 6 nm at high strain rates. The MD simulations at strain rates varying from 109 s−1 to 8 × 109 s−1 suggest an asymmetry in the flow stress values in tension and compression, with the nanocrystalline metal being stronger in compression than in tension. The tension-compression strength asymmetry is very small at 109 s−1, but increases with increasing strain rate. The calculated yield stresses and flow stresses under combined biaxial loading conditions (X-Y) gives a locus of points that can be described with a traditional ellipse. An asymmetry parameter is introduced that allows for the incorporation of the small tension-compression asymmetry. The biaxial yield surface (X-Y) is calculated for different values of stress in the Z direction, the superposition of which gives a full three-dimensional (3-D) yield surface. The 3-D yield surface shows a cylinder that is symmetric around the hydrostatic axis. These results suggest that a von Mises-type yield criterion can be used to understand the macroscopic deformation behavior of nanocrystalline Cu with a grain size in the inverse Hall–Petch regime at high strain rates.
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The research is supported by the Army Research Office (ARO) through the National Research Council Research Associateship Program.
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Manuscript submitted April 1, 2009.
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Dongare, A., Rajendran, A., Lamattina, B. et al. Atomic-Scale Study of Plastic-Yield Criterion in Nanocrystalline Cu at High Strain Rates. Metall Mater Trans A 41, 523–531 (2010). https://doi.org/10.1007/s11661-009-0113-x
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DOI: https://doi.org/10.1007/s11661-009-0113-x