爆炸烧结制备W-Al含能结构材料及其准静态压缩特性研究

Nearly fully dense W-Al energetic structural material (ESM) was successfully prepared by explosive sintering with W and Al powder with different particle sizes. It was found that shock wave pressure is the dominant factor for powder densification and the particle size of powder has a significant influence on the final density and microstructure of the compacted ESM. The smaller the W particle size is, the more severely the W particle agglomerate, which hinders the densification, leading to the formation of continuous W phase in the compacted ESM. The maximum compressive strength and failure strain of the sample reach 288 MPa and 20%, respectively. The mechanical properties and fracture mode of the consolidated material depend on the continuous phase, the ESM with continuous Al phase presents low compressive strength and good ductility with anaxial split failure, while the one with continuous W phase shows brittleness and high compressive strength with a shear failure, which is consistent with the properties of Al and W, respectively.