Hostname: page-component-76d6cb85b7-s74w7 Total loading time: 0 Render date: 2026-07-26T13:34:47.124Z Has data issue: false hasContentIssue false
  • English
  • Français

Iron Aluminide Composites

Published online by Cambridge University Press:  10 February 2011

J. H. Schneibel
J. H. Schneibel*
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6115, schneibeljh@oml.gov
Get access

Abstract

Iron aluminides with the B2 structure are highly oxidation and corrosion resistant. They arethermodynamically compatible with a wide range of ceramics such as TiC, WC, TiB2, and ZrB2. Inaddition, liquid iron aluminides wet these ceramics very well. Therefore, FeAI/ceramic compositesmay be produced by techniques such as liquid phase sintering of powder mixtures, or pressureless meltinfiltration of ceramic powders with liquid FeAl. These techniques, the resulting microstructures, andtheir advantages as well as limitations are described. Iron aluminide composites can be very strong.Room temperature flexure strengths as high as 1.8 GPa have been observed for FeAl/WC. Substantialgains in strength at elevated temperatures (1073 K) have also been demonstrated. Above 40 vol.% WCthe room temperature flexure strength becomes flaw-limited. This is thought to be due to processingflaws and limited interfacial strength. The fracture toughness of FeAl/WC is unexpectedly high andfollows a rule of mixtures. Interestingly, sufficiently thin (<1 μm) FeAl ligaments between adjacentWC particles fracture not by cleavage, but in a ductile manner. For these thin ligaments the dislocationpile-ups formed during deformation are not long enough to nucleate cleavage fracture, and theirfracture mode is therefore ductile. For several reasons, this brittle-to-ductile size transition does notimprove the fracture toughness of the composites significantly. However, since no cleavage cracks arenucleated in sufficiently thin FeAl ligaments, slow crack growth due to ambient water vapor does notoccur. Therefore, as compared to monolithic iron aluminides, environmental embrittlement is dramaticallyreduced in iron aluminide composites.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK4.4.1
Copyright
Copyright © Materials Research Society 1999

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.)

Article purchase

Temporarily unavailable

References

REFERENCES

1. Processing, Properties, and Applications of Iron Aluminides, Schneibel, J. H. and Crimp, M. A., eds., TMS, Warrendale, PA (1994).Google Scholar
2. International Symposium on Nickel and Iron Aluminides: Processing, Properties, and Applications, Deevi, S. C., Sikka, V. K., Maziasz, P. J., and Cahn, R. W., eds., ASM, Materials Park, OH (1997).Google Scholar
3. Hajaligol, M. R., Deevi, S. C., Sikka, V. K., Scorey, C. R., accepted for publication in Proceeedings of International Symposium on Iron Aluminides: Alloy Design, Processing, Properties & Applications, to appear in Materials Science and Engineering A.Google Scholar
4. Baker, I. and Munroe, P. R., International Materials Reviews 42, 181 (1997).CrossRefGoogle Scholar
5. Liu, C. T., Lee, E. H., and McKamey, C. G., Scr. Metall. 23, 875 (1989).CrossRefGoogle Scholar
6. Liu, C. T. and George, E. P, Scr. Metall. Mater. 24, 1285 (1990).Google Scholar
7. Lynch, R. J., Gee, K. A., and Heldt, L. A., Scr. Metall. Mater. 30, 945 (1994).Google Scholar
8. Nagpal, P. and Baker, I., Scr. Metall. Mater. 25, 2577 (1991).Google Scholar
9. Whittenberger, J. D., Mater. Sci. Eng. 77, 103 (1986).Google Scholar
10. Subramanian, R., McKamey, C. G., Schneibel, J. H., Buck, L. R., and P Menchhofer, A., Mater. Sci. Eng. A254, 119 (1998).CrossRefGoogle Scholar
11. Plucknett, K. P., Becher, P. E., and Subramanian, R., J. Mater. Res. 12, 2515 (1997).Google Scholar
12. Becher, P F and Plucknett, K. P., J. European Ceramic Society 18, 395 (1997).Google Scholar
13. Schneibel, J. H. and Becher, P. F., Iron and Nickel Aluminide Composites, in print, J. of the Chinese Institute of Engineers.Google Scholar
14. Schneibel, J. H., Carmichael, C. A., Specht, E. D., and Subramanian, R., Intermetallics 5, 61 (1997).CrossRefGoogle Scholar
15. Inoue, M. K., Suganuma, K., and Niihara, K., in High-Temperature Ordered Intermetallic Alloys VII, MRS Symposium Proceedings, , Koch et al., eds., MRS, Pittsburgh, PA, Vol.460, pp. 755–59 (1997).Google Scholar
16. Inoue, M., Nagao, H., Suganuma, K., Niihara, K., accepted for publication in Proceeedings of International Symposium on Iron Aluminides: Alloy Design, Processing, Properties & Applications, to appear in Materials Science and Engineering A.Google Scholar
17. Ravichandran, K. S., Acta Metall. Mater. 42, 1113 (1994).CrossRefGoogle Scholar
18. Schneibel, J. H. and Subramanian, R., in 1996 World Congress on Powder Metallurgy & Particulate Materials, Metal Powder Industries Federation, Vol.5, pp. 16–167 to 16–175 (1996).Google Scholar
19. Subramanian, R. and Schneibel, J. H., Mater. Sci. Eng. A239–240, 633 (1997).Google Scholar
20. Subramanian, R. and Schneibel, J. H., Intermetallics 5, 401 (1997).CrossRefGoogle Scholar
21. Guillermet, A. F., Metall. Trans. A 20A, 935 (1989).CrossRefGoogle Scholar
22. Subramanian, R. and Schneibel, J. H., Mater. Sci. Eng. A244, 103 (1998).Google Scholar
23. Schneibel, J. H. and Subramanian, R., in Boundaries and Interfaces in Materials: The David A. Smith Symposium, Pond, R. C., Clark, W. A. T., King, A. H., and Williams, D. B., eds., TMS, Warrendale, PA, pp. 315–321 (1998).Google Scholar
24. Subramanian, R. and Schneibel, J. H., Acta Mater. 46, 4733 (1998).CrossRefGoogle Scholar
25. Horton, J. A., in “The First Pacific Rim International Conference on Advanced Materials and Processing” Shi, C., Li, H., and Scott, A., eds., TMS, Warrendale, PA, pp. 745–750 (1992).Google Scholar
26. Schneibel, J. H. and Specht, E. D., Scr. Metall. Mater 31, 1737 (1994).Google Scholar
27. Subramanian, R. and Schneibel, J. H., Mater. Sci. Eng. A239–240, 633 (1997).Google Scholar