Abstract
Three-dimensional dislocation dynamics (DD) simulations are performed to investigate the size-dependent plasticity in submicron face-centered cubic (FCC) micropillars under torsion. By using a previously implemented surface nucleation algorithm within DD, we show that the plastic behavior of FCC micropillars under torsion is strongly affected by the crystallographic orientation: In 〈110〉 oriented submicron pillars, coaxial dislocations nucleate and pile up near the axis, leading to homogeneous deformation along the pillars. In contrast, in 〈100〉 and 〈111〉 oriented pillars, heterogeneous plasticity has been observed due to the formation of localized dislocation arrays. As a result of the existence of a coaxial slip plane in 〈110〉 oriented pillars, stronger size-dependent plasticity is observed in this case compared with those in other orientations.
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Acknowledgements
The authors gratefully acknowledge funding from the U.S. Department of Energy through the DOE EPSCoR Implementation Grant No. DE-SC0007074. W.C. and W.D.N. gratefully acknowledge support from the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under contracts No. DE-SC0010412 and No. DE-FG02-04ER46163, respectively.
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Ryu, I., Cai, W., Nix, W.D. et al. Anisotropic Size-Dependent Plasticity in Face-Centered Cubic Micropillars Under Torsion. JOM 68, 253–260 (2016). https://doi.org/10.1007/s11837-015-1692-1
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DOI: https://doi.org/10.1007/s11837-015-1692-1