Kinetics of a fast moving twin boundary in nickel

摘要: Abstract A complete description of high-rate dynamic deformation metals demands, in part, the fundamental understanding and characterization twin boundary (TB) kinetics. We use molecular dynamics (MD) to characterize TB kinetics nickel, which serves as a model material for face-centered cubic metals. The twinning dislocations (TD) fundamentally govern Propagation TD shares many common features with full dislocation kinetics, including non-linear stable propagation regimes forbidden velocities. However, experiences an additional drag (as compared dislocation) due damping interactions TB; these characteristics are reflected show that, Ni, velocities limited ∼ 650 m s - 1 , well below shear wave speed. insights gained from MD simulations inform our proposed kinetic relations TB, we how may be utilized both macroscopic crystal plasticity formulations.