Pressure-induced solid-state lattice mending of nanopores by pulse laser annealing.

摘要: This paper presents the pressure-induced solid-state lattice mending of nanopores in single-crystal copper by femtosecond laser annealing processes. The microscopic mechanism is investigated a modified continuum?atomistic modeling approach. Three typical phases, including (i) incubation dislocation nucleation, (ii) plastic deformation under combined effect pressure and atomic thermal diffusion, (iii) recovery reconstruction, are characterized via structure changes transient thermodynamic trajectories. simulation results reveal that structural pore originated heterogeneous nucleation dislocations from surface. shear-induced multiple glides found to significantly contribute nanopore process mending. rates two different modes, classical unsteady-state estimated be very each other, an order 104. In addition, location also influence threshold. Since largest amplitude wave built up at characteristic depth approximately 45?nm below irradiated surface, shock will directly impinge on induce fast if located within lower limit range depth. Furthermore, it interesting note close fluence generally than near These provide vital insights photomechanical interactions with microstructure metallic solid, proposed approach can further considered enhanced predict for various defects future.