Synthesis of iron aluminide-Al{sub 2}O{sub 3} composites by in-situ displacement reactions

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Composites consisting of an iron aluminide matrix with ceramic particle reinforcements, such as alumina, could improve the high temperature strength without compromising the oxidation resistance. In this paper, the feasibility of processing Fe-Al alloy/Al{sub 2}O{sub 3} composites by an in-situ displacement reaction between Fe-40 at.% Al and iron oxide, Fe{sub 2}O{sub 3}, is investigated. Simple powder metallurgical processing was performed without resorting to an externally applied pressures or deformations during the high temperature processing step. The microstructural features of the composites are rationalized based on results from diffusion couples. Preliminary mechanical properties such as fracture toughness, yield strength and hardness ... continued below

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20 p.

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Subramanian, R.; McKamey, C.G.; Buck, L.R. & Schneibel, J.H. September 1, 1997.

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Composites consisting of an iron aluminide matrix with ceramic particle reinforcements, such as alumina, could improve the high temperature strength without compromising the oxidation resistance. In this paper, the feasibility of processing Fe-Al alloy/Al{sub 2}O{sub 3} composites by an in-situ displacement reaction between Fe-40 at.% Al and iron oxide, Fe{sub 2}O{sub 3}, is investigated. Simple powder metallurgical processing was performed without resorting to an externally applied pressures or deformations during the high temperature processing step. The microstructural features of the composites are rationalized based on results from diffusion couples. Preliminary mechanical properties such as fracture toughness, yield strength and hardness are determined and compared with the values obtained for monolithic iron aluminide - Fe-28 at.% Al. Results suggest that a significant improvement in the properties is needed and further avenues for modifications, such as changes in the interface strength and externally applied forces during processing, are suggested.

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20 p.

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OSTI as DE97008439

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  • 4. international conference on high-temperature intermetallics, San Diego, CA (United States), 27 Apr - 1 May 1997

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  • Other: DE97008439
  • Report No.: CONF-970455--4
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 525046
  • Archival Resource Key: ark:/67531/metadc689719

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  • September 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Aug. 4, 2016, 7:07 p.m.

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Subramanian, R.; McKamey, C.G.; Buck, L.R. & Schneibel, J.H. Synthesis of iron aluminide-Al{sub 2}O{sub 3} composites by in-situ displacement reactions, article, September 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc689719/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.