In this study, Ti₃(Al,Ga)C₂/Al₂O₃ composites were successfully synthesized by in situ hot pressing at 1350 °C for 2 h using Ti, Al, TiC, and Ga₂O₃ as raw materials. X-ray diffraction and scanning electron microscopy were used for characterizing the phase identities and microstructures of the sintered composites. The dependence of the Vickers hardness and flexural strength on the Al₂O₃ content was found to be in single-peak type. Ti₃(Al_0.6,Ga_0.4)C₂/10.3vol%Al₂O₃ composite exhibited significantly improved mechanical properties. Vickers hardness and flexural strength of the composite reached 6.58 GPa and 527.11 MPa, which were 40% and 74% higher than those of Ti₃AlC₂, respectively. Formation of solid solution and incorporation of second phase of Al₂O₃ resulted in the opposite influence on the fracture toughness. Finally, the hardening and strengthening mechanisms were discussed in detail.

本研究以Ti，Al，TiC和Ga ₂ O ₃为原料，在1350°C下原位热压2 h ，成功合成了Ti ₃（Al，Ga）C ₂ / Al ₂ O ₃复合材料。X射线衍射和扫描电子显微镜用于表征烧结复合材料的相身份和微观结构。发现维氏硬度和弯曲强度对Al ₂ O ₃含量的依赖性为单峰型。Ti ₃（Al _0.6，Ga _0.4）C ₂ /10.3vol%Al ₂ O ₃复合材料表现出明显改善的机械性能。复合材料的维氏硬度和弯曲强度分别达到6.58 GPa和527.11 MPa，分别比Ti ₃ AlC ₂高40％和74％。固溶体的形成和第二相Al ₂ O _3的掺入对断裂韧性产生相反的影响。最后，对强化机制进行了详细讨论。