层状金属材料断裂行为的尺度与界面/晶界效应研究

Effects of Length Scale and Interface on Fracture Behavior of Metallic Laminated Materials

本研究采用三点弯曲实验方法系统地研究了具有不同尺度组元层和界面结构搭配的Cu/Au和Cu/Cr层状材料的断裂行为及其尺度与界面/晶界效应。研究发现,组元性质、尺度和界面/晶界结构是影响金属多层材料变形和断裂行为的主要因素。对于具有"透明"界面的Cu/Au多层材料,其变形和断裂行为表现出显著的尺度效应,而具有"模糊"界面的Cu/Cr多层材料的塑性相对较差,其变形和断裂行为没有明显的尺度效应。基于理论分析,提出了高强高韧层状金属材料的多尺度层状结构设计思路。

Fracture behavior and the effects of scale and interface for Cu/Au and Cu/Cr laminated materials comprised of different scale layers and interface structures were investigated by three-point bending testing method.It was found that constituent properties,layer scales and interface/boundary structures are dominated factors to influence deformation and fracture behaviors of the laminated material.For Cu/Au laminates with the transparent interface,the deformation and fracture behaviors exhibit strong the size effect,while the Cu/Cr laminates with the opaque interface have relatively low plasticity,and less size effect.Based the theoretical analysis,a clue in the design of multiscale laminated structures for metallic laminates with high strength and ductility is proposed.