Long Term Oxidation of Model and Engineering TiAl Alloys

Abstract

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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Acknowledgment

Appreciation is expressed to J. W. Smith and T. R. McCue for dedicated and excellent microscopy work. The long-term oxidation study efforts of the engineering γ-alloys at NASA Glenn was initiated by Bill Brindley, with whom many useful discussions on the oxidation and embrittlement mechanisms in Ti-base alloys are gratefully acknowledged.

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Correspondence to Ivan E. Locci.

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Locci, I.E., Brady, M.P. & Smialek, J.L. Long Term Oxidation of Model and Engineering TiAl Alloys. MRS Online Proceedings Library 646, 444–449 (2000). https://doi.org/10.1557/PROC-646-N5.50.1

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