Title

Long-Term Oxidation Behavior Of Aluminized Cmsx-4 Superalloys

Abstract

Thermally grown oxide (TOO) scale on aluminized CMSX-4 single crystal superalloy has been examined after long-term oxidation testing to investigate the spallation behavior using photo-stimulated luminescence spectroscopy (PSLS) and microscopy. Disk-shaped (2.54 cm dia. and 0.32 cm thickness) specimens were oxidized in air at 788°C (1450°F), 871°C (1600°F), 954°C (1750°F) and 1010°C (1850°F) for 1000, 2500, 5,000, 7500 and 10,000 hours corresponding to a total of 20 specimens. Spallation of TOO scale along the NiAl (B2) grain boundary ridges was observed for specimens exposed to higher temperature and longer time. At the lowest temperature of 788°C, a significant amount of metastable γ- and θ-alumina was observed by PSLS along with some spallation. This type of spallation did not occur along the grain boundary ridges, but within the grains themselves.

Publication Date

7-21-2003

Publication Title

TMS Annual Meeting

Number of Pages

283-291

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

0038048217 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0038048217

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