356 / 2019-02-27 19:56:18

Dynamic strength of diamond-SiC composite: Influence of diamond content and design

diamond-SiC composite; content; design; dynamic strength

全体主题 > High Pressure Physics and Materials Science

The diamond-SiC composite has a huge potential as an armor material because it has ultrahigh hardness, high fracture toughness, excellent wear resistance, low density and low coefficient of thermal expansion. However, the correlation of the diamond-SiC composite's microstructure and constituent with its properties during shock loading remain unclear. In this work, we construct novel diamond particles pattern (aggregation, random, and triangle) and various diamond content use designing distribution patterns of diamond particles reinforced SiC matrix has been proposed and it’s the macroscopic shock response and the mesoscopic damage mechanism has been explored by lattice-spring model to study the effect diamond content and diamond particles pattern on the dynamic strength of diamond-SiC composite. The results demonstrate that with increasing of diamond content, while the dynamic strength decreases after increasing. The diamond-SiC composite with diamond content of 73% has the best dynamic strength. Moreover, for the aggregation distribution pattern of diamond particles, the dynamic strength of diamond-SiC composite against shock loading is deteriorated. Meanwhile, for the random and triangle distribution pattern of diamond particles, the triangle distribution pattern of diamond particles superior others at shock stress less than 65 GPa and worse others at shock stress greater than 65 GPa. The results of these investigations provide a solid basis for designing the microstructure and controlling the phase content of such composites for use in a wide range of armor protection applications.