Abstract
A high-throughput, non-destructive photostimulated luminescence spectroscopy (PSLS) technique was used to analyze fifty oxidized Co-based γ/γ′ alloy samples for the presence of α-Al2O3. Alloys were produced by combinatorial ion-plasma deposition, and oxidation was performed at 1100 °C for 1 h in air. PSLS measurements are compared with microscopy of oxides in cross-section to relate the presence of the luminescence signal of α-Al2O3 with the thickness of the oxide scale. Analysis of the current dataset validates the use of PSLS as a rapid screening technique of oxidation behavior for the present materials system.
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Notes
The mechanisms of formation of these microstructures are fairly complex in the current 6-component alloy system. A detailed discussion will be presented in a separate publication on the results of the combinatorial oxidation studies. However, similar observations have been reported in Ni–Cr alloys [29] and Ni–Al alloys [30]. Briefly, it is posited that these morphologies arise as the system transitions from internal oxidation kinetics to external scale-forming behavior, followed by the lateral undercutting-growth of Al2O3 scale.
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Acknowledgements
This investigation was sponsored by the National Science Foundation under DMREF Grant DMR 1534264. The authors are grateful to GE Global Research, especially Dr. Don M. Lipkin and Messrs. Scott Weaver and Vince Tur for providing technical guidance and for performing the IPD synthesis of the combinatorial libraries. The technical assistance of Dr. Stephan Krämer and Messrs. Mark Cornish, Deryck Stave, and Chris Torbet is greatly appreciated.
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Stewart, C.A., Suzuki, A., Pollock, T.M. et al. Rapid Assessment of Oxidation Behavior in Co-Based γ/γ′ Alloys. Oxid Met 90, 485–498 (2018). https://doi.org/10.1007/s11085-018-9849-2
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DOI: https://doi.org/10.1007/s11085-018-9849-2