A basic tenet of material science is that the flow stress of a metal increases as its grain size
decreases, an effect described by the Hall-Petch relation. This relation is used extensively in …

Grain size has a profound effect on the mechanical response of metals. Molecular dynamics
continues to expand its range from a handful of atoms to grain sizes up to 50 nm, albeit …

We examine size scale and strain rate effects on single-crystal face-centered cubic (fcc)
metals. To study yield and work hardening, we perform simple shear molecular dynamics …

The grain size, and therefore the grain boundary density, is known to play a major role in the
flow stress of metallic materials. A linear relationship to the inverse of the square root of the …

Recent advances in the ability to generate extremes of pressure and temperature in dynamic
experiments and to probe the response of materials has motivated the need for special …

The plastic flow characteristics of body centered cubic metals, which is dominated by the
motion of screw dislocations, generally exhibits strong strain rate dependence. In-situ …

Ultrafine-grained materials display almost no strain hardening, an enhanced strain rate
sensitivity and grain boundary offsets during plastic deformation. It is expected that …

Recent experiments at strain rates reaching 0.1 GHz suggest a power-law dependence of
solid-phase shear stress on strain rate. Novel nonequilibrium molecular dynamics …

The correlation between the flow stress and grain size for severely deformed metals remains
undefined because the conventional Hall-Petch relationship ignores the expected …

Thin Fe and Al foils were ramp-compressed over several to tens of ns timescales to study the
time-dependence associated with the onset of plastic flow. Peak stress states of 15–200 …