Plasticity mechanisms in nanovoided b.c.c. metals under high strain rate compression

CARLOS RUESTES; EDUARDO BRINGA; ALEXANDER STUKOWSKI; JOAQUIN F. RODRIGUEZ NIEVA; GRACIELA BERTOLINO; YIZHE TANG; MARC A. MEYERS

Seattle

Conferencia; APS - 18th Biennial Intl. Conference of the APS Topical Group on Shock Compression of Condensed Matter; 2013

APS

Atomistic-scale simulations provide unique insights to plasticity mechanisms arising under extreme conditions where its relative nanoscopic length and time scales render experiments almost  impossible. Our studies explore the mechanical response and plasticity effects under uniaxial high strain rate compression for a Ta single crystal with a collection of spherical nanovoids, with a radius of 3-4 nm, providing an initial porosity of 5%-20%. We examine strain rate effects, from 107 1/s to 1010 1/s, in the dislocation density and dislocation-induced heating. The resulting dislocation densities are in good agreement with experimental results for shock-recovered samples.