Dynamic strength, reinforcing mechanism and damage of ceramic metal composites

Shock tolerance is desirable for ceramic particles-reinforced metal matrix composites in many applications, where the dislocation dynamics evolution under extreme load key but still elusive. Herein, we have investigated motion and interaction shock loading of SiC/Al nanocomposites using molecular simulations. We demonstrated that plastic deformation occurs at an impact velocity (0.5 km/s) lower than Hugoniot elastic limit aluminum due to reflected shear wave effect. The Al/SiC interfaces act as a emitter control multiplication density slip direction, opening new pathway achieve ultrahigh-strength via loading. When (1.0 or 1.5 exceeds limit, effect nanoparticles on structure has changed from multiplying retarding dislocations. spall strength improves dislocations pile-up interface. Instead, damage exacerbated, owing enhanced residual peak stress interface reflection waves. In addition, abnormal softening determined by atomic revealed, which could be suppressed increasing energy dissipation. Meanwhile, dynamic compressive depends pressure structures evolution. Our atomistic insights might helpful designing advanced shock-tolerant materials.