Abstract
( TiBw + TiCp )/ Ti 6 Al 4 V composites were fabricated by reactive hot-pressing at the temperature range of 800~1200°C using the starting materials of TiB 2, C and Ti 6 Al 4 V powders. The XRD results suggested that the reaction between C and Ti happened 900°C and above, while the reaction between TiB 2 and Ti happen at 1100°C and above. SEM results also suggested that the reaction between C and Ti was prior to that between TiB 2 and Ti . With the increase of the sintering temperature, the size of TiC particle and TiB whisker reinforcements increased gradually. The TiC particle was formed at the boundaries of original Ti 6 Al 4 V particles, while the TiB whiskers grew toward the inside of Ti 6 Al 4 V particles, which resulted in a strong bonding between neighboring Ti 6 Al 4 V particles. The results of hardness and relative density tests showed that the ( TiBw + TiCp )/ Ti 6 Al 4 V composites sintered at 1100°C had the highest hardness and relative density compared with that sintered at other temperatures.
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