氧含量对原位合成(TiB+La_2O_3)/Ti复合材料力学性能的影响

Effect of Oxygen Content on Mechanical Properties of In-Situ Synthesized(TiB+La_2O_3)/Ti Composite

采用真空自耗电弧炉熔炼技术,利用钛与LaB_6之间的反应原位合成了具有不同氧含量的(TiB+La_2O_3)/Ti复合材料;分析了复合材料的物相组成、增强体形貌以及显微组织,测试了复合材料的室温、高温拉伸性能以及热稳定性。结果表明:较高氧含量的复合材料室温下强度及塑性都较低,但在高温下尤其是700℃时具有较高的抗拉强度;在650℃保温100h后,含氧量对其强度影响不大,但高氧含量的塑性较低。

The composites （TiB＋La203）/Ti （TMCs） with different oxygen contents were synthesized by in- situ reaction between Ti and LaB6 using vacuum consumable electrode arc furnace melting techniquee; the phases, reinforcements morphology and microstructure of composites were analyzed; the tensile properties at room and high temperatures, as well as the thermal stability of the composites were also tested. The results show that the TMCs with higher oxygen contents had lower strength and plasticity at room temperature, while the composite had higher tensile strength at high temperatures, especially at 700 ℃; oxygen contents had little effect on strength after heat at 650℃ for 100 h, but the ductility of the composite with high oxygen contents was lower.