Abstract
A quantized crystal plasticity (QCP) model, which connects emerging deformation physics with the unique mechanical properties of nanocrystalline metals, is presented in this chapter. The QCP model adopts a discrete/quantized constitutive flow rule associated with dislocation depinning from grain boundary ledges; in particular, single slip events across nanoscale grains impart large (∼1 %) increments in grain-averaged plastic shear. The flow rule is implemented for a NC assembly within the framework of crystal plasticity. By reproducing aggregate flow stress evolution and internal stress within subpopulations of grains measured by in situ X-ray diffraction tests, the QCP model predicts a transition from continuous and relatively homogenous, multiple-dislocation slip to quantized and highly heterogeneous single dislocation slip as grain size decreases to the nanometer scale.
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Li, L., Anderson, P.M. (2016). Quantized Crystal Plasticity Modeling of Nanocrystalline Metals. In: Weinberger, C., Tucker, G. (eds) Multiscale Materials Modeling for Nanomechanics. Springer Series in Materials Science, vol 245. Springer, Cham. https://doi.org/10.1007/978-3-319-33480-6_13
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