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Advanced intermetallic γ-TiAl based alloys with improved microstructural stability during creep

Published online by Cambridge University Press:  02 January 2015

M. Kastenhuber ,
B. Rashkova ,
H. Clemens  and
S. Mayer
M. Kastenhuber
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstr. 12, A-8700 Leoben, Austria
B. Rashkova
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstr. 12, A-8700 Leoben, Austria
H. Clemens
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstr. 12, A-8700 Leoben, Austria
S. Mayer
Affiliation:
Department of Physical Metallurgy and Materials Testing, Montanuniversitaet Leoben, Roseggerstr. 12, A-8700 Leoben, Austria
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Abstract

Ensuring microstructural stability under technical relevant conditions is a determining criterion for the development of innovative high-temperature materials. In this work, the influ-ence of C and Si on the microstructural stability during creep exposure was investigated for a β-solidifying γ-TiAl based alloy with a nominal composition of Ti-43.5Al-4Nb-1Mo-0.1B (in at.%), named TNM. With a two-step heat treatment a microstructure consisting of fine lamellar α2/γ-colonies, surrounded by βo-phase and areas of discontinuous precipitation, starting from the boundaries of the lamellar colonies, was adjusted. Creep tests were carried out to examine the potential of C and Si to prevent microstructural instability during creep and hence improving the creep properties. At 815 °C the discontinuous precipitation process of the TNM alloy continues during ensuing creep testing leading to a reduced creep resistance. In comparison, the minimum creep rate of the TNM-0.3C-0.3Si alloy was significantly decreased caused by the lower βo-phase content and average lamellar spacing within the α2/γ-colonies, the precipitation of p-Ti3AlC carbides and the retarded kinetics of discontinuous precipitation.

Keywords

microstructurephase equilibriaalloy
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy07-03
Copyright
Copyright © Materials Research Society 2014 

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References

REFERENCES

Clemens, H. and Mayer, S., Advanced Engineering Materials 15, 191 (2013).CrossRefGoogle Scholar
Appel, F., Paul, J.D.H., and Oehring, M., Gamma titanium aluminide alloys: science and technology (Wiley-VCH, Weinheim, 2011).CrossRefGoogle Scholar
Schwaighofer, E., Clemens, H., Mayer, S., Lindemann, J., Klose, J., Smarsly, W., and Gü-ther, V., Intermetallics 44, 128 (2014).CrossRefGoogle Scholar
Wallgram, W., Schmoelzer, T., Cha, L., Das, G., Güther, V., and Clemens, H., International Journal of Materials Research 100, 1021 (2009).CrossRefGoogle Scholar
Schillinger, W., Clemens, H., Dehm, G., and Bartels, A., Intermetallics 10, 459 (2002).CrossRefGoogle Scholar
Mitao, S. and Bendersky, L.A., Acta Materialia 45, 4475 (1997).CrossRefGoogle Scholar
Yamamoto, R., Mizoguchi, K., Wegmann, G., and Maruyama, K., Intermetallics 6, 699 (1998).CrossRefGoogle Scholar
Cha, L., Clemens, H., and Dehm, G., International Journal of Materials Research 102, 703 (2011).CrossRefGoogle Scholar
Tian, W.H. and Nemoto, M., Intermetallics 5, 237 (1997).CrossRefGoogle Scholar
Scheu, C., Stergar, E., Schober, M., Cha, L., Clemens, H., Bartels, A., Schimansky, F.-P., and Cerezo, A., Acta Materialia 57, 1504 (2009).CrossRefGoogle Scholar
Park, H.S., Nam, S.W., Kim, N.J., and Hwang, S.K., Scripta Materialia 41, 1197 (1999).CrossRefGoogle Scholar
Menand, A., Huguet, A., and Nérac-Partaix, A., Acta Materialia 44, 4729 (1996).CrossRefGoogle Scholar
Appel, F. and Oehring, M., in Titanium and Titanium Alloys Fundamentals and Applications (WILEY-VCH, Weinheim, 2003), pp. 89–152.Google Scholar
Sun, F.-S., Kim, S.-E., Cao, C.-X., Lee, Y.-T., and Yan, M.-G., Scripta Materialia 45, 383 (2001).CrossRefGoogle Scholar
Gouma, P.I. and Karadge, M., Materials Letters 57, 3581 (2003).CrossRefGoogle Scholar
Schwaighofer, E., Rashkova, B., Clemens, H., Stark, A., and Mayer, S., Intermetallics 46, 173 (2014).CrossRefGoogle Scholar
Huber, D., Clemens, H., and Stockinger, M., MRS Proceedings 1516, (2012).Google Scholar