Abstract:Al₂O₃ matrix composites reinforced with Fe₃Al nano-particles were fabricated by hot processing at 1450-1600℃. The effect of Fe₃Al content on the densification, mechanical properties and microstructure of the composites was investigated. The results show that some elongated Al₂O₃ grains are observed. Fe₃Al particles are mainly situated at grain boundaries of the matrix while smaller particles are trapped within the alumina grains. The addition of Fe₃Al nanoparticles improves the mechanical properties of alumina. The maximum strength and toughness of the Fe₃Al/Al₂O₃ nanocomposites are 832MPa and 7.96MPa·m^1/2, respectively.

Key words:   alumina; iron aluminide(Fe₃Al); composite