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

C. J. RUESTES; E. M. BRINGA; A. STUKOWSKI; J.F. RODRÍGUEZ NIEVA; G. BERTOLINO; Y. TANG; M.A. MEYERS

Seattle

Congreso; APS - SCCM 2013; 2013

Atomistic-scale simulations provide unique insights to plasticitymechanisms arising under extreme conditions where its relativenanoscopic length and time scales render experiments almost impossible.Our studies explore the mechanical response and plasticity effects underuniaxial high strain rate compression for a Ta single crystal with acollection of spherical nanovoids, with a radius of 3-4 nm, providing aninitial porosity of 5%-20%. We examine strain rate effects, from107/s to 1010/s, in the dislocation density anddislocation-induced heating. The resulting dislocation densities are ingood agreement with experimental results for shock-recovered samples.Atomistic-scale simulations provide unique insights to plasticitymechanisms arising under extreme conditions where its relativenanoscopic length and time scales render experiments almost impossible.Our studies explore the mechanical response and plasticity effects underuniaxial high strain rate compression for a Ta single crystal with acollection of spherical nanovoids, with a radius of 3-4 nm, providing aninitial porosity of 5%-20%. We examine strain rate effects, from107/s to 1010/s, in the dislocation density anddislocation-induced heating. The resulting dislocation densities are ingood agreement with experimental results for shock-recovered samples.