Cui Sen, Cui Chunxiang, Wang Xin
School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China.
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300401, China.
Materials (Basel). 2023 Jun 28;16(13):4661. doi: 10.3390/ma16134661.
A TiAl composite containing hybrid particles and whisker reinforcements is fabricated by vacuum melting. The results of this study show that the comprehensive mechanical properties and refining effect of the material are best when the content of reinforcement is 1 wt.%, and then the mechanical properties begin to deteriorate as the content increases further. Finely dispersed NbC particles and uniformly dispersed TiAlC whiskers are the ideal second phases. The synergistic strengthening effect of NbC particles and in situ TiAlC whiskers are key to the improvement of mechanical properties. Compared with the TiAlNb matrix, the fracture stress/strain of the composite at 1073 K is improved from 612 MPa/19.4% to 836 MPa/26.6%; the fracture toughness at room temperature is improved from 18.8 MPa/m to 27.4 MPa/m.
通过真空熔炼制备了一种含有混合颗粒和晶须增强体的TiAl复合材料。本研究结果表明，当增强体含量为1 wt.%时，材料的综合力学性能和细化效果最佳，随着含量进一步增加，力学性能开始恶化。细小弥散的NbC颗粒和均匀分布的TiAlC晶须是理想的第二相。NbC颗粒与原位TiAlC晶须的协同强化作用是力学性能提高的关键。与TiAlNb基体相比，该复合材料在1073 K时的断裂应力/应变从612 MPa/19.4%提高到836 MPa/26.6%；室温下的断裂韧性从18.8 MPa/m提高到27.4 MPa/m。
