In situ study of the scale formation on γ-TiAl during isothermal oxidation at 700°C and on heating

Nombela, M.; Kolarik, V.; Groß, Martin Florian; Fietzek, H.; Eisenreich, N.

doi:10.1179/mht.2000.009

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“…TiAl alloys are being investigated for low-pressure turbine (LPT) blade applications, exhaust nozzle components and compressor cases in advanced subsonic and supersonic engines [1][2], and exhaust valves in automobiles [2][3][4]. Significant progress has been made in understanding the fundamental aspects of the oxidation behavior of binary TiAl alloys [5][6][7][8][9][10][11][12]. However, most of this work has concentrated on shorter term (< 1000 hours), higher temperature (900°C-1000°C) exposures.…”

Section: Introductionmentioning

confidence: 99%

Long Term Oxidation of Model and Engineering TiAl Alloys

2000

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The purpose of this research was to characterize the oxidation behavior of several model (TiAl, TiAl-Nb, TiAl-Cr, TiAl-Cr-Nb) and engineering alloys (XD, K5, Alloy 7, WMS) after long-term isothermal exposure (~7000 h) at 704°C, and after shorter time exposure (~1000 h) at 800°C in air. High-resolution field emission and microprobe scanning electron microscopy were used to characterize the scales formed on these alloys. Similarities and differences observed in the scales are correlated with the various ternary and quaternary microalloying additions.

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