原位自生(TiB+La_2O_3)/TC4钛基复合材料的显微组织和力学性能

Microstructure and Mechanical Properties of In-situ Synthesized(TiB+La_2O_3)/TC4 Titanium Matrix Composite

利用钛与镧、硼单质之间的原位反应,经真空自耗电弧熔炼与后续的热加工工艺制备了增强体含量不同的(TiB+La2O3)/TC4钛基复合材料,并研究了它的显微组织和室温拉伸性能。结果表明:该复合材料的基体为网篮状组织,增强体分布均匀,其中TiB呈短纤维状并沿加工方向分布,La2O3呈短棒状或颗粒状;与基体TC4合金相比,复合材料的室温抗拉强度均有所提高,且随着TiB与La2O3增强体含量的增多而增大,增强体起到了较好的增强作用;复合材料的拉伸断裂方式均为韧性断裂。

In-situ synthesized(TiB+La2O3)/TC4 composites with different reinforcements contents were produced by vacuum consumable arc melting and heat treatment utilizing the reactions between Ti,B and La,and the microstructure and mechanical properties of the composite were studied.The results show that the basketweave structure and dispersed reinforcements were obtained in the composites,the short fibrous TiB reinforcement distributed along processing direction and the La2O3 reinforcement was in short-rob like and granulated state.Compared with TC4 alloy,the room temperature tensile strength of the composites increased with the increase of TiB and La2O3 reinforcement contents and the renforcements had good potentiation to the substrate.The fracture mechanism of the composites was ductile rupture.