利用Al-TiO2-TiC体系,通过机械球磨和反应热压制备出Ti3AlC2与Al2O3两相原位内生成增强TiAl3金属基复合材料.借助DSC、XRD、SEM和TEM研究了复合材料的反应机制、显微组织、力学性能及抗氧化性能.结果表明,球磨50 h后的复合粉末经1 250℃/50 MPa保温10 min烧结后可得到组织均匀细小且致密的Ti3 AlC2-Al2O3/TiAl3复合材料,其密度、维氏硬度、室温三点弯曲强度、断裂韧性及压缩强度分别为3.8 g/cm3、8.4 GPa、658.9MPa、7.9 MPa·m1/2和1 742.0 MPa,1 000℃的高温压缩强度为604.1 MPa.Ti3AlC2-Al2O3/TiAl3复合材料的增韧机制主要包括Ti3AlC2和Al2O3颗粒的剥离、Ti3AlC2相导致的裂纹偏转和桥接以及Ti3 AlC2颗粒的变形及层裂.Ti3 AlC2-Al2O3/TiAl3复合材料在700～1 000℃温度区间内生成的氧化层虽不致密,但仍表现出优异的抗高温循环氧化性能.
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