Investigation of Phase Composition and Microstructure of the FeAl/Al₂O₃ Composites Fabricated by Mechanical Alloying Process and Pressureless Sintering Process

Abstract:

The FeAl/Al₂O₃ composites were fabricated by pressureless sintering process. The FeAl intermetallics compounds powders were fabricated by mechanical alloying and heat treatment process. The FeAl intermetallics compounds powders and Al₂O₃ powders were mixed and the FeAl/Al₂O₃ composite powders were prepared. The FeAl/Al₂O₃ composites bulks were fabricated by pressureless sintering process at 1600°C for 2h. The phase composition and microstructure of FeAl intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition and microstructure of the FeAl/Al₂O₃ composites sintered bulks were investigated. The XRD patterns results showed that the Fe-Al intermetallics compounds powders were fabricated by mechanical alloying for 60h. The FeAl intermetallics compounds powders were fabricated by heat treatment at 800°C, 900°C and 1000°C. The microstructure showed that the mean particles size of the FeAl intermetallics compounds powders produced by mechanical alloying and heat treatment process was rather fine and about 4-5μm. The XRD patterns results showed that there existed the FeAl phase and Al₂O₃ phase in sintered composites. The FeAl/Al₂O₃ composites bulks exhibited the homogenous and compact microstructure. The mean particles size of FeAl was about 4-5μm and the mean particles size of Al₂O₃ was about 5-10μm. The density and relative density of the FeAl/Al₂O₃ composites increased gradually with the increase of FeAl content.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 968-971
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.968
• Online since: May 2011
• Authors: Tao Jiang
• Keywords: FeAl/Al₂O₃ Composites, Mechanical Alloying (MA), Microstructure, Pressureless Sintering

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