Hostname: page-component-586b7cd67f-t7fkt Total loading time: 0 Render date: 2024-11-23T07:28:02.171Z Has data issue: false hasContentIssue false
  • English
  • Français

Mechanical properties of NiAl-Mo composites produced by specially controlled directional solidification

Published online by Cambridge University Press:  29 November 2012

G. Zhang ,
L. Hu ,
W. Hu ,
G. Gottstein ,
S. Bogner  and
A. Bührig-Polaczek
G. Zhang
Affiliation:
Institute for Physical Metallurgy and Metal Physics, RWTH Aachen University, Kopernikusstraße 14, D-52074 Aachen, Germany
L. Hu*
Affiliation:
Institute for Physical Metallurgy and Metal Physics, RWTH Aachen University, Kopernikusstraße 14, D-52074 Aachen, Germany
W. Hu
Affiliation:
Institute for Physical Metallurgy and Metal Physics, RWTH Aachen University, Kopernikusstraße 14, D-52074 Aachen, Germany
G. Gottstein
Affiliation:
Institute for Physical Metallurgy and Metal Physics, RWTH Aachen University, Kopernikusstraße 14, D-52074 Aachen, Germany
S. Bogner
Affiliation:
Foundry Institute, RWTH Aachen University, Intzestraße 5, 52056 Aachen, Germany
A. Bührig-Polaczek
Affiliation:
Foundry Institute, RWTH Aachen University, Intzestraße 5, 52056 Aachen, Germany
*
*Correspondent author. Tel.: +49 (0) 241 80 20 25 7; fax: +49 (0) 241 80 22 30 1. E-mail address: [email protected]
Get access

Abstract

Mo fiber reinforced NiAl in-situ composites with a nominal composition Ni-43.8Al-9.5Mo (at.%) were produced by specially controlled directional solidification (DS) using a laboratory-scale Bridgman furnace equipped with a liquid metal cooling (LMC) device. In these composites, single crystalline Mo fibers were precipitated out through eutectic reaction and aligned parallel to the growth direction of the ingot. Mechanical properties, i.e. the creep resistance at high temperatures (HT, between 900 °C and 1200 °C) and the fracture toughness at room temperature (RT) of in-situ NiAl-Mo composites, were characterized by tensile creep (along the growth direction) and flexure (four-point bending, vertical to the growth direction) tests, respectively. In the current study, a steady creep rate of 10-6s-1 at 1100 °C under an initial applied tensile stress of 150MPa was measured. The flexure tests sustained a fracture toughness of 14.5 MPa·m1/2at room temperature. Compared to binary NiAl and other NiAl alloys, these properties showed a remarkably improvement in creep resistance at HT and fracture toughness at RT that makes this composite a potential candidate material for structural application at the temperatures above 1000 °C. The mechanisms responsible for the improvement of the mechanical properties in NiAl-Mo in-situ composites were discussed based on the investigation results.

Keywords

compositestrengthtoughness
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1516: Symposium JJ – Intermetallic-Based Alloys—Science, Technology and Applications , 2013 , pp. 255 - 260
Copyright
Copyright © Materials Research Society 2012 

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

Joslin, S. M., Ph.D. Thesis, University of Tennessee, Knoxville, TN (1995).Google Scholar
Misra, A., Wu, Z.L., Kush, M.T., and Gibala, R., Philos. Mag. A, 78, 533 (1998).CrossRefGoogle Scholar
Heredia, F.E., He, M.Y., Lucas, G.E., Evans, A.G., Dève, H.E. and Konitzer, D., Acta Metall. Mater., 41, 505 (1993).10.1016/0956-7151(93)90079-8CrossRefGoogle Scholar
Bei, H. and George, E.P., Acta Mater, 53, 69 (2005).CrossRefGoogle Scholar
Brown, W.F. and Srawley, J.E., ASTM special Publication No.410, ASTM, 13 (1966).Google Scholar
Hu, L., Hu, W., Gottstein, G., Bogner, S., Hollad, S. and Bührig-Polaczek, A., Mater. Sci, Eng. 539, 211 (2012).CrossRefGoogle Scholar
Misra, A. and Gibala, R., Intermetallics, 8, 1025 (2000).10.1016/S0966-9795(00)00079-0CrossRefGoogle Scholar
Mukherjee, A.K., Bird, J.E. and Dorn, J.E., Trans. ASM., 62, 155 (1964).Google Scholar
Noebe, R.D., Bowman, R.R. and Nathal, M.V., Int. Mater. Rev., 38, 192 (1993).10.1179/imr.1993.38.4.193CrossRefGoogle Scholar
Farraro, R. and McLellan, Rex. B., Metall. Trans., 8, 1563(1977).CrossRefGoogle Scholar
Ren, W., Guo, J., Li, G. and Wu, J., Mater. T. JIM, 45 1731 (2004).CrossRefGoogle Scholar
Nathal, M. V. and Ebert, L. J., Metall. Trans., 16A, 427 (l985).CrossRefGoogle Scholar