TiC/Ti-xY基复合材料的熔铸法制备及微观组织

为了研究钇对TiC/Ti复合材料微观组织的影响,采用熔铸法制备了TiC/Ti-xY复合材料,并利用SEM、X射线衍射、EDS研究了复合材料的微观组织结构、相组成和元素组成,分析了复合材料中TiC的形成过程和微观组织.结果表明:制备的复合材料由钛和碳化钛两相组成,增强相TiC分布较为均匀,初生TiC呈枝晶状,并有含钇细长条共晶TiC析出;增强相TiC与基体界面干净,无反应层;随着钇含量的增加,初生TiC枝晶变得细小,枝晶间距加大,细长条共晶TiC增多.

Fabrication and microstructure of TiC/Ti -xY composites by melting-casting

In order to study the effects of yttrium on the microstructure of the TiC/Ti composite, the Ti - xY matrix composites reinforced with TiC particles were fabricated by melting-casting. SEM, XRD and an energy spectrometer were employed to analyze the morphology, phase, and composition. The formation of TiC was discussed. The morphology of TiC in composites was also observed. The results showed that the composites were composed of Ti and TiC phases and the TiC in composites were dispersed uniformly in the matrix without contamination and a reaction zone on its interface. The morphology of the primary TiC particles was dendrite. And the fine stripe eutectic TiC containing yttrium separated out. The primary dendrite TiC became finer, arm spacing increased, and fine stripe eutectic TiC increased as the yttrium increased.