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.
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References
T. Tetsui, Adv. Eng. Mat. 3, 307–310 (2001).
R. R. Boyer and J. C. Williams, “Developments in Research and Applications in the Titanium Industry in the USA”, Ti 2011, ed. L. Zhou, H. Chang, Y. Lu and D. Xu, (Science Press Beijing 2012) pp. 10–19.
H. Clemens, M. Schloffer, E. Schwaighofer, R. Werner, A. Geitzenauer, B. Rashkova, R. Pippan and S. Mayer, these proceedings.
H. Clemens and S. Mayer, Adv. Eng. Mat. 14, DOI 10.1002/adem.201200231 (2012).
A. Rahmel and P. J. Spencer, Oxid. Met. 35, 53–68 (1991).
J. M. Rakowski, F. S. Petit, G.H. Meier, F. Dettenwanger, E. Schumann and M. Rühle, Scripta Met. Mat. 33, 997–1003 (1995).
A. Donchev, B. Gleeson and M. Schütze, Intermetallics 11, 387–398 (2003).
A. Donchev, E. Richter, R. Yankov and M. Schütze, Intermetallics 14, 1168–1174 (2008).
P. Masset and M. Schütze, Adv. Eng. Mat 10, 666–674 /2008).
T. Schmoelzer, S. Mayer, C. Seiler, F. Haupt, V. Güther, P. Staron, K,-D. Liss and H. Clemens, Adv. Eng. Mat. 13, 306–311 (2011).
S. Mayer, C. Sailer, H. Nakashima, T. Schmoelzer, T. Lippmann, P. Staron, K.-D. Liss, H. Clemens and M. Takayama, Mat. Res. Soc. Proc. 1295, 113–118 (2011).
C. Leyens, “Oxidation and Protection of Titanium Alloys and Titanium Aluminides”, Titanium and Titanium Alloys, ed. C. Leyens and M. Peters (WILEY-VCH, 2003) pp.187–230.
M. Schütze, „Protective Oxide Scales and their Breakdown”, ed. D.R. Holmes and R. B. Waterhouse (John Wiley & Sons, 1997) pp.67–102.
A. Donchev and M. Schütze, Mat. Sci. Forum 638-642, 1294–1298 (2010).
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Donchev, A., Pflumm, R., Mayer, S. et al. High Temperature Oxidation Protection of Multi-Phase Mo-Containing TiAl-Alloys by the Fluorine Effect. MRS Online Proceedings Library 1516, 95–100 (2013). https://doi.org/10.1557/opl.2012.1563
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DOI: https://doi.org/10.1557/opl.2012.1563