The process of preparing SiC fiber-reinforced γ-TiAl composites by the conventional methods is difficult and complicated due to the high reactivity, high melting point and poor deformability of γ-TiAl alloys. In this work, suction casting, a promising method for preparing SiC_f/TiAl composite, had been attempted. In the process, γ-TiAl alloy melt was introduced rapidly into a mold within pre-arranged fibers that were coated with additional layer of titanium alloy. This simple method successfully prevented serious reactions between the alloy melt and the fibers which remained intact during the solidification process. The interfacial reaction layer was observed by optical microscopy, scanning electron microscopy (SEM). The interfacial reaction products were identified by transmission electron microscopy (TEM). Tensile tests of the matrix alloy and composites were performed at room temperature and 800 °C. The results exhibited that the tensile strength of SiC_f/γ-TiAl composite was higher than that of the matrix alloy at both room temperature and 800 °C. At room temperature, tensile strength of SiC_f/γ-TiAl composite was increased by about 7% (50 MPa), whereas a double increase in tensile strength 14% (100 MPa) was obtained at 800 °C. The titanium alloy coating on the fiber not only prevented the serious interfacial reaction between the γ-TiAl alloy melt and the SiC fiber, but also played a role in delaying the propagation of cracks in the matrix to the fiber at 800 °C. The fracture mechanism of the composite was analyzed by fracture metallographic analysis.

由于γ- TiAl合金的高反应性，高熔点和不良的可变形性，用常规方法制备SiC纤维增强的γ - TiAl复合材料的过程是困难和复杂的。在这项工作中，尝试了吸铸法，这是一种制备SiC _f / TiAl复合材料的有前途的方法。在这个过程中，γ将TiAl合金熔体快速引入模具中的预定纤维中，并在纤维中涂上一层钛合金。这种简单的方法成功地防止了合金熔体和纤维之间的严重反应，这些反应在凝固过程中保持完整。通过光学显微镜，扫描电子显微镜（SEM）观察界面反应层。通过透射电子显微镜（TEM）鉴定界面反应产物。在室温和800°C下对基体合金和复合材料进行拉伸测试。结果表明，在室温和800°C下，SiC _f / γ- TiAl复合材料的拉伸强度均高于基体合金。在室温下，SiC _f的拉伸强度/ γ- TiAl复合材料增加了约7％（50 MPa），而在800°C时抗拉强度增加了14％（100 MPa）。纤维上的钛合金涂层不仅防止了γ- TiAl合金熔体与SiC纤维之间的严重界面反应，而且还起到了延迟裂纹在800°C下向纤维传播的作用。通过断裂金相分析对复合材料的断裂机理进行了分析。