中文摘要：

利用Ti-Al-TiO2-Fe2O3体系的放热反应,原位热压合成了Fe掺杂的Al2O3/TiAl复合材料。借助XRD和SEM研究了复合材料的物相组成和显微结构以及Fe2O3引入量对复合材料结构和力学性能的影响。结果表明：产物主要由γ-TiAl,α2-Ti3Al,Al2O3相构成,Al2O3颗粒分布于基体交界处,存在一定的团聚;随Fe2O3的掺杂量增大,Al2O3颗粒呈细小弥散分布,同时基体晶粒尺寸也减小,较好地改善了材料的力学性能,复合材料的相对密度和洛氏硬度逐渐增大。Fe2O3掺杂量为0.84%（质量分数）时,复合材料弯曲强度和断裂韧度达到最大值,分别为624MPa和6.63 MPa·m1/2。

英文摘要：

Fe-doped Al2O3 /TiAl composites were fabricated by in situ hot-pressing method with exothermic reaction of Al,Ti,TiO2 and Fe2O3 powder.The phase composition and microstructure of composites were characterized by XRD and SEM,the effects of Fe2O3 addition on microstructure and mechanical properties of the prepared composites were also investigated.The results indicate that the primary phases of composite are composed of TiAl,Ti3Al,Al2O3,and Al2O3 particles assemble on the boundary of matrix grains and the Al2O3-distribution regions connect each other.With the increasing of Fe2O3 content,the in situ Al2O3 particles are depressively distributed and the grains are refined,resulting in a better mechanical properties,the relative density and hardness of the composites are gradually increased.When the Fe2O3 content is 0.84%（mass fraction）,there presents a better bending strength and fracture toughness,and the bending strength attains 624MPa,moreover,the fracture toughness reaches 6.63 MPa.m1/2.