W-5Re-xSiC复合材料的微观结构与力学性能

Microstructure and Mechanical Properties of W-5Re-xSiC Composites

为了提高W-5Re合金的室温强韧性,采用电弧熔炼法通过添加SiC制备高性能的W-5Re-xSiC复合材料,并研究SiC添加量(05%4%,质量分数)对W-5Re-xSiC复合材料的微观结构和力学性能的影响规律。结果显示,W-5Re-xSiC复合材料主要由W(Re)固溶体相、W2C和W5Si33相组成。随着SiC添加量的增加,基体晶粒细化,脆硬性的金属间化合物含量增加;W-5Re-xSiC复合材料的强韧性先提高后降低。当SiC添加量为1%时,在基体的细晶强化和W5Si3韧化的共同作用下,W-5Re-1SiC复合材料的强韧性最佳,抗压强度为1859 MPa,断裂应变为32.87%。

In order to improve the room temperature strength and toughness of W-5 Re alloy,SiC was added to form W-5 Re-x SiC composites with high performance using vacuum arc melting.The relationship between the SiC content and the microstructure and mechanical properties of W-5 Re-x SiC composites was investigated.The results show that the W-5 Re-x SiC composites are mainly composed of W(Re)solid solution,W2 C and W5 Si3.As the SiC content is increased,the grain size of the W(Re)is refined and the contents of brittle intermetallic compounds are increased.The strength and fracture toughness of W-5 Re-x SiC composites firstly increase and then decrease.When the SiC content is 1 wt%,the strength and fracture toughness of the W-5 Re-1 SiC composite reach the maximum values of 1859 MPa and 32.87%,respectively,originating from the combination of grain refinement and W5 Si3 toughening.