MECHANICAL BEHAVIORS OF CRYSTALLINE-AMORPHOUS NANOLAMINATES BASED ON STRAIN GRADIENT DISLOCATION THEORY

Crystalline-amorphous nanolaminates exhibit superior mechanical properties such as high strength and good ductility. For quantitative analysis the mechanical behaviors of crystalline-amorphous nanolaminate, a model based on the special statistically stored dislocations density and strain gradient was proposed. At the outset of the plastic deformation, dislocations are nucleated from the crystalline-amorphous interfaces. Then, dislocations glide across the crystal layer and are absorbed by the opposite crystalline-amorphous interface. Due to the different properties and interplay between the crystalline phase and amorphous phase, the corresponding dislocation evolution behavior in crystalline phase and the interface failure was analyzed. The calculation results are in agreement with experimental results and the interface of crystalline-amorphous nanolaminate can avoid stress concentrations that lead to fracture failure.