论文部分内容阅读
采用放电等离子烧结技术原位合成了TiB增强Ti 1.5Fe 2.25Mo复合材料,研究了烧结温度对复合材料微观组织和力学性能的影响规律。结果表明,随着烧结温度的升高,钛合金中TiB晶须的长细比迅速减小;然而,复合材料的相对密度及TiB的体积含量随着烧结温度的升高而不断增大。由于TiB晶须长细比的减小会导致复合材料强度的降低,而复合材料的相对密度及TiB体积含量的增大又会带来复合材料强度的增加,因此,在这两种因素的共同作用下,最终导致TiB/Ti 1.5Fe 2.25Mo复合材料的弯曲强度随着烧结温度的升高而缓慢增大。在烧结温度为1150°C时,TiB/Ti 1.5Fe 2.25Mo复合材料具有最大的弯曲强度1596 MPa。
The TiB reinforced Ti 1.5Fe 2.25Mo composite was synthesized in-situ by spark plasma sintering. The influence of sintering temperature on the microstructure and mechanical properties of the composite was studied. The results show that the slenderness ratio of TiB whiskers decreases rapidly with the increase of sintering temperature. However, the relative density of TiB and the volume fraction of TiB increase with the increase of sintering temperature. Because the reduction of slenderness ratio of TiB whiskers will lead to the decrease of the strength of the composites, and the relative density of the composites and the increase of TiB content will lead to the increase of the strength of the composites. Therefore, The bending strength of TiB / Ti 1.5Fe 2.25Mo composites increases slowly with the increase of sintering temperature. The TiB / Ti 1.5Fe 2.25Mo composites have the highest flexural strength of 1596 MPa at the sintering temperature of 1150 ° C.