Preparation and mechanical properties of Fe3Al/Al2O3 nano-/micro-composite
(Key Laboratory for Material Liquid Structure and Heredity of Education Ministry,
Key Laboratory for Engineering Ceramics of Shandong Province，
Shangdong University, Ji′nan 250061, China)
Key Laboratory for Engineering Ceramics of Shandong Province，
Shangdong University, Ji′nan 250061, China)
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·m1/2, respectively.
Key words: alumina; iron aluminide(Fe3Al); composite