EFFECT OF ZIRCONIUM ADDITION ON MICROSTRUCTURE AND MECHANICAL PROPERTY OF TiC/Ti6Al4V COMPOSITES
TiC/Ti6Al4V composites with different Zr additions were prepared successfully in a consumable vacuum arc furnace equipped with a water-cooled copper crucible and the effect of the Zr content on the microstructure and mechanical property of 15 vol.％TiC/Ti6A14V composites was investigated by XRD, SEM and hardness testing. The results show that when the level of Zr addition is less than 4 wt.％, the morphology of the primary TiC in the composites is dendrite, and the petal-shape, piece-shape or palpus-shape eutectic TiC separates out around the primary TiC. The average size of the primary TiC decreases and the amount of eutectic TiC increases gradually with increasing Zr content. The effects of Zr on morphology of the primary TiC weaken with further addition of Zr. And the hardness (HRC) of composites was obviously increased in the whole range of Zr addition. The refinement mechanism of Zr was attributed to the combined effects of increase in nucleation rate at the constitutionally supercooled zone ahead of the solidification front and reduction in growth rate.
TiC/Ti6Al4V composites Zr addition microstructure refinement mechanism
XULIANG MA XIANG WANG LI LI PENGTAO GAI CHENGWU ZHU
Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin, Peoples Rep Center for Biomedical Materials and Engineering, Harbin Engineering University, Harbin, Peoples Rep
国际会议
第五届先进材料与加工国际会议(Fifth International Conference on Advanced Materials and Processing ICAMP-5)
哈尔滨
英文
1389-1394
2008-09-03（万方平台首次上网日期，不代表论文的发表时间）