The high temperature oxidation behaviour of an ODS FeAl alloy

The high temperature oxidation behaviour of an ODS FeAl alloy

The oxidation behaviour of an oxide dispersion-strengthened (ODS) FeAl intermetallic, microalloyed with Zr and B and strengthened by a fine dispersion of Y 2O 3, is investigated at 1100°C for exposures of up to 200 h. The results show that a pure alumina scale is formed irrespective of the exposure...

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Veröffentlicht in:Intermetallics 2000-04, Vol.8 (4), p.439-446
Hauptverfasser: Montealegre, M.A., González-Carrasco, J.L., Morris-Muñoz, M.A., Chao, J., Morris, D.G.
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A. Iron aluminides (based on FeAl)
B. Oxidation
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container_end_page 446
container_issue 4
container_start_page 439
container_title Intermetallics
container_volume 8
creator Montealegre, M.A.
González-Carrasco, J.L.
Morris-Muñoz, M.A.
Chao, J.
Morris, D.G.
description The oxidation behaviour of an oxide dispersion-strengthened (ODS) FeAl intermetallic, microalloyed with Zr and B and strengthened by a fine dispersion of Y 2O 3, is investigated at 1100°C for exposures of up to 200 h. The results show that a pure alumina scale is formed irrespective of the exposure time. The oxidation rate is far inferior to that found on PM 2000, a commercial alumina forming ODS ferritic superalloy. Limited scale spallation is observed in the intermetallic alloy from the early stages of oxidation. Scale failure, which is shown to occur during the cooling stage after oxidation and not at the high temperature of oxidation itself, results from the high compressive residual stresses in the scale induced by the misfit in the thermal expansion coefficients of the scale and the substrate. Failure of the scale may be supressed by using a very low cooling rate after oxidation.
doi_str_mv 10.1016/S0966-9795(99)00168-5
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subjects A. Iron aluminides (based on FeAl)
B. Oxidation
title The high temperature oxidation behaviour of an ODS FeAl alloy
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