Zr添加对TiC/Ti6Al4V复合材料组织和性能的影响

Effects of Zr Addition on Microstructure and Properties of TiC/Ti6Al4V Composites

用熔铸法制备原位自生TiC/Ti6Al4V复合材料,研究Zr元素的添加对TiC/Ti6Al4V复合材料显微组织、压缩性能和耐磨性能的影响。结果表明:当Zr添加量在1%～4%(质量分数,下同)范围内变化时,初生TiC呈枝晶状,在初生TiC周围伴有花瓣状、片状或须状共晶TiC生成;且随着Zr含量的增加,初生TiC的尺寸减小,共晶TiC的数量增加,复合材料的耐磨性能和压缩性能增强。当Zr添加量在6%～10%内时,枝晶状TiC又变得发达,但在此范围内随着Zr含量的增加,复合材料的耐磨性和压缩性能呈下降趋势。当Zr量为4.0%时,复合材料的抗压强度达到峰值。

In-situ TiC/Ti6Al4V composites were prepared by a melting-casting method and the effects of Zr addition on the microstructure,compression property and abrasive property of the TiC/Ti6Al4V composites were studied.The results show that when the Zr addition content is in the range of 1%-4%（mass fraction,similarly hereinafter）,the morphology of the primary TiC in the composites is dendrite,with the petal-shape,piece-shape or palpus-shape eutectic TiC around the primary TiC.The average size of the primary TiC decreases,the amount of eutectic TiC increases and the abrasive property and compression property increase gradually with increasing Zr content.When the Zr content is 6%-10%,the primary TiC becomes developed again,and the abrasive property and compression property decrease with the increasing of Zr content.The compression strength of the composites is up to the peak value when the Zr content is 4%.