We study dynamic recrystallization of Silver (Ag) single crystals nanocubes subject to supersonic impact velocities. Our study shows that upon the impact, a rich, architected microstructure develops in the nanocubes with specific orientations. This dynamic recrystallization appears in nanocubes with crystallographic orientations that promote homogeneous dislocation emission in several slip systems. In these cases, a large number of dislocations is emitted, leading to avalanche of dislocations that interact and rotate the original lattice nucleating new grains. The avalanche of dislocation is sustained with a shock wave that propagates through the nanocube due to the high impact velocity. The resulting microstructure, called gradient nano-grained (GNG) structure, has shown to provide excellent mechanical properties. Our systematic numerical experiments shed light into the factors that promote the dynamic recrystalization and provide a pathway to control microstructure by impacting the particles in preferred orientations.

Gradient nano-grained silver from high-velocity impact of microcubes

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