Investigation of Microstructure and Property of the Fe₃Al/Al₂O₃ Composites Fabricated by Mechanical Alloying Process and Plasma Active Sintering Process

Abstract:

The Fe₃Al/Al₂O₃ composites were fabricated by plasma active sintering process. The Fe₃Al intermetallics compounds powders were fabricated by mechanical alloying and heat treatment, then the Fe₃Al powders and Al₂O₃ powders were mixed and the Fe₃Al/Al₂O₃ composite powders were prepared, so the Fe₃Al/Al₂O₃ composites were fabricated by plasma active sintering process at 1200°C for 5min under the pressure of 30MPa. The phase composition and microstructure of the Fe₃Al intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition, microstructure and mechanical property of the Fe₃Al/Al₂O₃ composites sintered bulks were investigated. The XRD patterns results showed that there existed Fe3Al phase and Al₂O₃ phase in the sintered composites. The Fe₃Al/Al₂O₃ composites sintered bulks exhibited the homogenous and compact microstructure, the Fe₃Al particles were homogenously distributed in the Al₂O₃ matrix. The mean particles size of Fe₃Al intermetallics was about 2-3μm and mean particles sizes of Al₂O₃ was about 2-3μm. The density and relative density of the Fe₃Al/Al₂O₃ composites increased gradually with the increase of Fe₃Al content. The fracture strength and fracture toughness of the Fe₃Al/Al₂O₃ composites increased gradually with the increase of Fe₃Al content. The elastic modulus and hardness(HRA) of Fe₃Al/Al₂O₃ composites decreased gradually with the increase of Fe₃Al content.

• Periodical: Advanced Materials Research (Volumes 194-196)
• Pages: 1689-1692
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.194-196.1689
• Online since: February 2011
• Authors: Tao Jiang
• Keywords: Fe₃Al/Al₂O₃ Composite, Mechanical Property, Microstructure, Plasma Active Sintering

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