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Processing, Microstructure, and Thermal Expansion Measurements for High Temperature Ru-Al-Cr B2 Alloys

Published online by Cambridge University Press:  01 February 2011

Yutaka Hashimoto ,
Norihiko L. Okamoto ,
Manuel Acosta ,
David R Johnson  and
Haruyuki Inui
Yutaka Hashimoto
Affiliation:
hashimo@t01.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Kyoto, Sakyo-ku, Japan
Norihiko L. Okamoto
Affiliation:
n.okamoto@at4.ecs.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Kyoto, Sakyo-ku, Japan
Manuel Acosta
Affiliation:
acosta@purdue.edu, Purdue University, Materials Engineering, United States
David R Johnson
Affiliation:
davidjoh@purdue.edu, Purdue University, Materials Engineering, United States
Haruyuki Inui
Affiliation:
haruyuki.inui@materials.mbox.media.kyoto-u.ac.jp, Kyoto University, Materials Science and Engineering, Kyoto, Sakyo-ku, Japan
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Abstract

The B2 intermetallic compound RuAl has a melting temperature above 2000 °C and is a candidate for high temperature structural applications. A large extension of the B2 phase field is found in the Ru-Al-Cr system as was documented by the characterization of arc-melted and heat treated alloys. Two compositions consisting of Ru-35Al-19Cr and Ru-20Al-38Cr (at. %) were directionally solidified in an optical floating zone furnace. Depending upon the processing conditions, single phase, polycrystalline, B2 microstructures could be produced. The coefficient of thermal expansion (CTE) was measured from room temperature to 1250 °C for the Ru-20Al-38Cr alloy, and an average value of 11×10-6 K-1 was found. Additionally, the thermal conductivity was measured as 27 W/mK at room temperature for the Ru-20Al-38Cr B2 alloy and as 89 W/mK for binary RuAl.

Keywords

phase equilibriathermal conductivityzone melting
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1128: Symposium U – Advanced Intermetallic-Based Alloys for Extreme Environment and Energy Applications , 2008 , 1128-U05-25
Copyright
Copyright © Materials Research Society 2009

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References

REFERENCES

[1]. Fleischer, R.L., Zabala, R. J., Met Trans. A 21A, 2709 (1990).Google Scholar
[2]. Wolff, I.M., Sauthoff, G., Acta Mater. 45, 2949 (1997).Google Scholar
[3]. Lu, D.C., Pollock, T. M., Acta Mater. 47, 1035 (1999).Google Scholar
[4]. Mücklich, F. and IIić, N., Intermetallics 13, 5 (2005).Google Scholar
[5]. Reynolds, T.D. and Johnson, D.R., Mater. Res. Symp. Proc. 842, S6.2.1 (2005).Google Scholar
[6]. Acosta, M., MS thesis, 2008, Materials Engineering, Purdue University.Google Scholar
[7]. Fleischer, R.L. and McKee, D.W. Met. Trans. A 24A, 759 (1993).Google Scholar
[8]. Tryon, B., Pollock, T.M., Gigliotti, M.F.X. and Hemker, K., Scripta Mater. 50, 845 (2004).Google Scholar
[9]. Clark, R.W. and Whittenberger, J.D., Thermal expansion, 8. (Plenum Press, 1981) p. 189.Google Scholar
[10]. Hanai, S., Terada, Y., Ohkubo, K., Mohri, T., and Suzuki, T., Intermetallics 4, S41 (1996).Google Scholar
[11]. Anderson, S.A. and Lang, C.I., Scripta Mater. 38, 493 (1998).Google Scholar