Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 458, Issue 1-2, Pages 184-194Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2006.12.064
Keywords
superalloys; ruthenium; oxidation; chromium; microstructure
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The cyclic oxidation behavior of Ru-containing single crystal superalloys at 1100 degrees C has been investigated in alloys with Ru contents ranging from 3.5 to 9 at.% (5.7-14.1 wt.%) and Cr additions ranging from 0 to 8 at.% (0-6.7 wt.%). High levels of Cr additions (8 at.%) significantly improved oxidation resistance, while increased levels of Ru adversely affected the oxidation performance. A multi-layered scale formed on the alloy surface, and it generally consisted of an external layer of NiO, an intermediate layer of spinel and an Al2O3 inner layer. The presence of a continuous alpha-Al2O3 inner layer clearly improved oxidation performance. Ru-rich precipitates were observed in the spinet layer of alloys which displayed poor oxidation resistance. High levels of Cr additions not only reduced the propensity for formation of Ru-rich phases in the oxide, but also promoted the formation of a continuous alumina layer adjacent to the superalloy, without stabilization of any detrimental phases in the superalloy. (C) 2007 Elsevier B.V. All rights reserved.
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