Investigation of Microstructure and Mechanical Property of the Fe₃Al/Al₂O₃ Composites Fabricated by Mechanical Alloying Process and Hot-Pressing Process

Abstract:

The Fe₃Al/Al₂O₃ composites were fabricated by hot-pressing process in this research. 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 hot-pressing process at 1300°C for 2h under the pressure of 35MPa. 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 properties 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 compounds was about 3-4μm. The Fe₃Al/Al₂O₃ composites exhibited more homogenous and compact microstructure with the increase of Fe₃Al content in the Al₂O₃ matrix. 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 the Fe₃Al/Al₂O₃ composites decreased gradually with the increase of Fe₃Al content.

• Periodical: Key Engineering Materials (Volume 492)
• Pages: 102-106
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.492.102
• Online since: September 2011
• Authors: Tao Jiang, Xiao Ping Shi
• Keywords: Fe₃Al/Al₂O₃ Composite, Hot-Pressing, Mechanical Property, Microstructure

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