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We present the rate-dependent constitutive response of hierarchical Al matrix composites which comprise a bi-modal distribution of Al in fine (nanocrystalline Al containing micro-sized B 4 C particles) and coarse (micro-grained Al) grain regimes. The strength of these composites is improved by various strengthening mechanisms. Shear localization is observed to be the primary failure mode....
In situ transmission electron microscopy nanocompression tests of aluminum alloy pillars revealed higher yield stress and greater ductility post-annealing, analogous to what is seen in bulk testing. The annealed pillars showed a complex three-dimensional deformation behavior, whereas the as-extruded sample showed a simpler two-dimensional plasticity. This difference in behavior is consistent with...
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