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采用无压浸渗法制备了Al2O3/Al复合材料,研究了材料的微观组织与力学性能。复合材料组织致密,颗粒分布均匀,无偏聚现象。铸造态复合材料的Al2O3颗粒表面存在界面反应物,经过透射电镜观察和XRD分析确认该反应物为MgAl2O4。T6处理后界面反应程度加剧,但弯曲强度达到439.4MPa,断口中撕裂棱和韧窝的数量较少,以颗粒的脆性断裂为主。Al2O3/Al复合材料中界面反应的存在提高了润湿性,促进了无压自发浸渗。
Al2O3 / Al composites were prepared by pressureless infiltration method. The microstructure and mechanical properties of the composites were studied. Composites are densely organized, with uniform particle distribution and no segregation. The interface reaction material exists on the surface of the Al2O3 particles in the as-cast composite material, and the reaction product is confirmed to be MgAl2O4 by TEM observation and XRD analysis. After T6 treatment, the degree of interfacial reaction increased, but the flexural strength reached 439.4 MPa. The number of tearing edges and dimples in the fracture was less, which was dominated by the brittle fracture of the particles. The presence of interfacial reaction in Al2O3 / Al composites improves wettability and promotes spontaneous infiltration without pressure.