热处理对(TiB+TiC)/Ti-B20 复合材料拉伸性能和蠕变性能的影响

By means of X-ray diffraction (XRD), scanning electron microscope (SEM), room temperature tensile tests and creep tests, a new type of (TiB+TiC)/Ti-B20 composite was studied, the heat treatment was carried out with solution at different temperature and high-low duplex aging treatment, and the effects of microstructures on tensile properties at room temperature and creep behavior of the material was studied. The results show that the highest tensile strength of the alloy reaches 1734 MPa due to the double strengthening effect of the reinforcement and secondary α phase after high-low duplex aging treatment. The primary α phase can improve the plasticity of the alloy, but will reduce dispersion strengthening effect. The high temperature creep stress index n of the alloy after heat treatment is 4.66 and 5.80, respectively, and the creep deformation mechanism is dislocation climbing. The creep properties of the alloys after solution treated in the two-phase zone (790 ℃) and high-low duplex aging treatment are better. The primary α phase and secondary α phase have significant effects on the creep resistance of the alloy. TiB and TiC play an important strengthening role in the creep process. The high temperature creep toughness of the alloy is high, which shows a ductile fracture mode of (TiB+TiC) concentrated load.