【摘要】 以MoSi₂粉末与Ti粉末为原料,采用放电等离子烧结法制备Ti含量（质量分数,下同）分别为40%,50%,60%,70%的4组Ti-MoSi₂复合材料,对材料的组织形貌以及密度、显微硬度和断裂韧性等性能进行表征和测试。结果表明:4组Ti-MoSi₂复合材料组织中均出现核-壳结构,主要由Ti₅Si₃和Mo₃Si组成,当Ti含量达到70%时,出现了单质Ti。随Ti含量增加,Ti-MoSi₂复合材料的密度和显微硬度降低,断裂韧性增大。4组Ti-MoSi₂复合材料的密度分别为5.54,5.34,5.24和5.16 g/cm³,显微硬度分别为8.54,8.22,8.13和8.02 GPa,断裂韧性分别为7.02,10.36,11.62和24.52 MPa·m^1/2。更多还原

【Abstract】 Using MoSi₂ powders and Ti powders as raw materials, four groups of Ti-MoSi₂ composites with Ti content（mass fraction, %） of 40%, 50%, 60% and 70% were prepared by spark plasma sintering, respectively, and the microstructure, density, hardness and fracture toughness of the material were analyzed and tested. The results show that, the four groups of Ti-MoSi₂ composites all appear core-shell structure. Ti-MoSi₂ composites are mainly composed of Ti₅Si₃ and Mo₃Si. When the addition amount of Ti increases to 70%, Ti elementary phase appears in the sample. With increasing Ti content, the density and microhardness of Ti-MoSi₂ decrease, and the fracture toughness increases gradually. The density of Ti-MoSi₂ composites in the four groups is 5.54, 5.34, 5.24 and 5.16 g/cm³, Vickers hardness is 8.54, 8.22, 8.13 and 8.02 GPa, and fracture toughness is 7.02, 10.36, 11.62 and 24.52 MPa·m^1/2, respectively.更多还原