纳米金属层状材料强塑性的界面调控

Nanolayered metallic composites exhibit many extraordinary properties, such as high strength, high radiation damage resistance, and good thermal stability. Therefore, it has broad potential applications in many fields. However, similar to other nanocrystalline metallic materials, the strength-ductility trade-off in nanolayered metallic composites is significant. Therefore, how to effectively balance the strength and ductility of nanolayered metallic composites is still a huge challenge in interface engineering. When the layer thickness is reduced to the nanoscale, the proportion of the interface increases substantially, and the density of mobile dislocations in grains decreases sharply, at the same time interface becomes the main source of plastic deformation. Thus, research into the relationship between the interface structure and its plastic behaviors is the key to understanding the microdeformation mechanisms of nanolayered metallic composites and their influence on mechanical properties. Based on the latest research progress, taking typical nanolayered metallic composites as examples, the key points, such as strengthening mechanisms, interface structures, plastic behaviors, and interface design methods are disscussed, and the prospects for future research trends are proposed. This review provides theoretical guidance for developing high-strength and high-ductility nanolayered metallic composites via interface engineering.