Hostname: page-component-8678677fb7-q5qzn Total loading time: 0 Render date: 2026-10-09T16:08:52.340Z Has data issue: false hasContentIssue false
  • English
  • Français

High Temperature Oxidation Protection of Multi-Phase Mo-Containing TiAl-Alloys by the Fluorine Effect

Published online by Cambridge University Press:  29 November 2012

Alexander Donchev ,
Raluca Pflumm ,
Svea Mayer ,
Helmut Clemens  and
Michael Schütze
Alexander Donchev
Affiliation:
DECHEMA-Forschungsinstitut, D-60486 Frankfurt am Main, Germany
Raluca Pflumm
Affiliation:
DECHEMA-Forschungsinstitut, D-60486 Frankfurt am Main, Germany
Svea Mayer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, A-8700 Leoben, Austria
Helmut Clemens
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, A-8700 Leoben, Austria
Michael Schütze
Affiliation:
DECHEMA-Forschungsinstitut, D-60486 Frankfurt am Main, Germany
Get access

Abstract

Intermetallic titanium aluminides are potential materials for application in high temperature components. In particular, alloys solidifying via the β-phase are of great interest because they possess a significant volume fraction of the disordered body-centered cubic β-phase at elevated temperatures ensuring good processing characteristics during hot-working. Nevertheless, their practical use at temperatures as high as 800°C requires improvements of the oxidation resistance. This paper reports on the fluorine effect on a multi-phase TiAl-alloy in the cast and hot-isostatically pressed condition at 800°C in air. The behavior of the so-called TNM material (Ti-43.5Al-4Nb-1Mo-0.1B, in at %) was compared with that of two other TiAl-alloys which are Nb-free and contain different amounts of Mo (3 and 7 at%, respectively). The oxidation resistance of the fluorine treated samples was significantly improved compared to the untreated samples. After fluorine treatment all alloys exhibit slow alumina kinetics indicating a positive fluorine effect. Results of isothermal and thermocyclic oxidation tests at 800°C in air are presented and discussed in the view of composition and microstructure of the TiAl-alloys investigated, along with the impact of the fluorine effect on the oxidation resistance of these materials.

Keywords

oxidationscanning electron microscopy (SEM)thermogravimetric analysis (TGA)

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Tetsui, T., Adv. Eng. Mat. 3, 307–310 (2001).3.0.CO;2-3>CrossRefGoogle Scholar
Boyer, R. R. and Williams, J. C., “Developments in Research and Applications in the Titanium Industry in the USA”, Ti 2011, ed. Zhou, L., Chang, H., Lu, Y. and Xu, D., (Science Press Beijing 2012) pp. 10–19.Google Scholar
Clemens, H., Schloffer, M., Schwaighofer, E., Werner, R., Geitzenauer, A., Rashkova, B., Pippan, R. and Mayer, S., these proceedings.Google Scholar
Clemens, H. and Mayer, S., Adv. Eng. Mat. 14, DOI 10.1002/adem.201200231 (2012).Google Scholar
Rahmel, A. and Spencer, P. J., Oxid. Met. 35, 53–68 (1991).CrossRefGoogle Scholar
Rakowski, J. M., Petit, F. S., Meier, G.H., Dettenwanger, F., Schumann, E. and Rühle, M., Scripta Met. Mat. 33, 997–1003 (1995).CrossRefGoogle Scholar
Donchev, A., Gleeson, B. and Schütze, M., Intermetallics 11, 387–398 (2003).CrossRefGoogle Scholar
Donchev, A., Richter, E., Yankov, R. and Schütze, M., Intermetallics 14, 1168–1174 (2008).CrossRefGoogle Scholar
Masset, P. and Schütze, M., Adv. Eng. Mat 10, 666–674 /2008).CrossRefGoogle Scholar
Schmoelzer, T., Mayer, S., Seiler, C., Haupt, F., Güther, V., Staron, P., Liss, K,-D. and Clemens, H., Adv. Eng. Mat. 13, 306–311 (2011).CrossRefGoogle Scholar
Mayer, S., Sailer, C., Nakashima, H., Schmoelzer, T., Lippmann, T., Staron, P., Liss, K.-D., Clemens, H. and Takayama, M., Mat. Res. Soc. Proc. 1295, 113–118 (2011).CrossRefGoogle Scholar
Leyens, C., “Oxidation and Protection of Titanium Alloys and Titanium Aluminides”, Titanium and Titanium Alloys, ed. Leyens, C. and Peters, M. (WILEY-VCH, 2003) pp. 187–230.CrossRefGoogle Scholar
Schütze, M., „Protective Oxide Scales and their Breakdown“, ed. D.R. Holmes and R. B. Waterhouse (John Wiley & Sons, 1997) pp. 67–102.Google Scholar
Donchev, A. and Schütze, M., Mat. Sci. Forum 638–642, 1294–1298 (2010).CrossRefGoogle Scholar