Abstracts

In this study, rolled and solutionized magnesium alloy with 6% of aluminum (A6) is characterized under varying strain rates (10^-4-10^6 /s) and pressures up to 10 GPa. Low ( ~ 0.001 /s) to high strain rate (~10^3 /s) experiments are conducted in a universal…

The microstructures of shock compressed metals and metallic alloys reveal tell-tale signs of plasticity. For instance, the residual microstructure of shock recovered metals and metallic alloys may reveal an increase in dislocation density, increase in twin density, stacking faults, etc. with increase in shock…

Understanding the mechanisms that control shear-dominated failure under dynamic loading is of critical importance to the Army for enabling lightweight armor systems and autonomous platforms. The fundamental chemistry-processing-structure-properties-performance interactions at multiple length scales are poorly understood, however, a full understanding is required to improve…

The shock response of CuxZr100-x (x = 30, 50 and 70) metallic glasses (MGs) is understood using large-scale molecular dynamics simulations. Piston velocities from Up = 0.125 to 2.5 km/s are simulated, corresponding to shock pressures from 3 to 130 GPa. For each composition,…

Advanced alloys usually contain a high density of interfaces. When they are subjected to a high strain-rate deformation, the interaction between the dislocation-mediated plastic flow and those interfaces dictate their overall performances. During a dislocation-interface reaction, a pile up may form and introduce a…