Abstract
Fe 3Al nano-particles and commercial purity Al 2O 3 powders were used as raw materials to fabricate in situ reinforced Al 2O 3/Fe 3Al nano/micro-composites. Densification and microstructure were studied. The Al 2O 3 matrix grains were characterized by platelet grains. The Fe 3Al particles inhibited the grain growth of Al 2O 3 grains and limited the densification of the composites. In Al 2O 3/Fe 3Al composites, the Fe 3Al particles were uniformly dispersed in the Al 2O 3 matrix. The major Fe 3Al micro-particles, about 1 μm in average size, existed at Al 2O 3 grain boundaries, and the Fe 3Al nano-particles were found embedded in the matrix grains. The grain size of the intragranular particles ranged from several to several hundred nanometers. The grain size and aspect ratio of Al 2O 3 platelet grains and distribution of intragranular Fe 3Al could be optimized by controlling the Fe 3Al contents and sintering process. The in situ formed Al 2O 3 platelet grains, as well as Fe 3Al dispersoids, were beneficial to the increase of the mechanical properties of alumina.
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