纳米SiC颗粒增强Ti-6Al-4V基复合材料的制备和力学性能

摘要

Differentmassfractions (0, 5%, 10%, and 15%) ofthesynthesized nano SiC particles reinforced Ti?6Al?4V (Ti64) alloy metal matrix composites(MMCs)were successfully fabricated by the powder metallurgy method. The effects of addition ofSiC particle on the mechanical properties of the composites such as hardness and compressive strength were investigated. The optimum density(93.33%)was obtained at the compaction pressure of 6.035MPa. Scanning electron microscopic (SEM) observations of the microstructures revealed that the wettability and the bonding force were improved in Ti64 alloy/5% nano SiCpcomposites. The effect of nano SiCpcontentinTi64 alloy/SiCpmatrix composite on phase formation was investigated by X-ray diffraction.The correlation between mechanical parameter and phase formation was analyzed. The new phase of brittle interfaced reaction formedinthe 10%and 15%SiCpcomposite specimens and resulted in no beneficial effect on the strength andhardness. The compressive strength and hardness of Ti64alloy/5% nano SiCpMMCs showed higher values. Hence,5%SiCpcan be considered to be theoptimal replacement content for the composite.%采用粉末冶金技术制备含不同质量分数(0,5%,10%和15%)纳米SiC颗粒增强的Ti?6Al?4V(Ti64)金属基复合材料(MMCs)，研究添加纳米 SiC 颗粒对复合材料力学性能如硬度和抗压强度的影响。结果表明，当压缩载荷为6.035 MPa时，复合材料具有最佳的相对密度(93.33%)。SEM显微组织观察结果表明，Ti64/5%SiCp复合材料的润湿性和结合力得到了提高。采用X射线衍射技术研究Ti64/SiCp复合材料中纳米SiC颗粒含量对其相组成的影响，并分析其力学性能与相组成的关系。含10%和15% SiCp的复合材料由于脆性界面反应产生了新相，此新相对复合材料的强度和硬度不利。Ti64/5%SiCp金属基复合材料的抗压强度和硬度较高，因此5%SiCp是此复合材料的最佳含量。