Hostname: page-component-586b7cd67f-vdxz6 Total loading time: 0 Render date: 2024-11-29T07:40:36.159Z Has data issue: false hasContentIssue false
  • English
  • Français

The Contribution of Matrix Plasticity to the “Frictional” Sliding of Debonded Fibers in Sapphire-Reinforced TiAl Matrix Composites

Published online by Cambridge University Press:  15 February 2011

J. M. Galbraith ,
D. A. Koss  and
J. R. Hellmann
J. M. Galbraith
Affiliation:
Structures and Controls Division, Directorate of Space and Missiles Technology, Phillips Laboratory, Edwards AFB, CA 93524-7400
D. A. Koss
Affiliation:
Center for Advanced Materials, The Pennsylvania State University, University Park, PA 16802
J. R. Hellmann
Affiliation:
Center for Advanced Materials, The Pennsylvania State University, University Park, PA 16802
Get access

Abstract

Large-scale fiber displacement behavior, usually characterized by a “frictional” sliding stress (τslide), has been studied in two sapphire-reinforced TiAl systems. Experimental results from fiber pushout and reverse push-back tests indicate that the large-scale sliding behavior of debonded fibers leads to an average τslide-value which progressively decreases during fiber displacements. Previous studies of SCS-6 (SiC) fiber-reinforced glass and metal matrix composites have attributed decreases in τslide to the fracture and wear of fiber asperities. However, given a matrix in which fiber asperities do not easily wear (e.g., a TiAl alloy), SEM examination of the fiber/matrix interface indicates that matrix plasticity plays a dominant role in the decrease of τslide with fiber displacement. Experimental evidence suggests that the observed decrease in τslide can be attributed to (1) a decrease in fiber roughness perceived by the matrix due to matrix grooving and (2) a relaxation of radial clamping as a result of material removal from the interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 143
Copyright
Copyright © Materials Research Society 1994

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

1. Evans, A. G., Zok, F. W., and Davis, J., Composites Sci. and Tech. 42, 3–24 (1991).Google Scholar
2. Hutchinson, J. W. and Jensen, H. M., Mech. Mater. 9, 139–163 (1990).Google Scholar
3. Liang, C. and Hutchinson, J. W., Harvard University, 1992 (to be published).Google Scholar
4. Koss, D. A., Kailas, M. N., and Hellmann, J. R. in Intermetallic Matrix Composites II, edited by Miracle, D. B., Anton, D. L., and Graves, J. A. (Mater. Res. Soc. Proc. 273, Pittsburgh, PA, 1992) pp. 303–313.Google Scholar
5. Sigl, L. S. and Evans, A. G., Mech. Mater. 8, 1–12 (1989).Google Scholar
6. Evans, A. G. and McMeeking, R. M., Acta Metall. Mater. 34, 2435–2441 (1986).Google Scholar
7. Kantzos, P. T., Eldridge, J. I., Koss, D. A., and Ghosn, L. J. in Intermetallic Matrix Composites II, edited by Miracle, D. B., Anton, D. L., and Graves, J. A. (Mater. Res. Soc. Proc. 273, Pittsburgh, PA, 1992) pp. 135–142.Google Scholar
8. Jero, P. D. and Kerans, R. J., Scripta Metall. Mater. 24 (12), 2315–2318 (1990).Google Scholar
9. Jero, P. D., Kerans, R. J., and Parthasarathy, T. A., J. Am. Ceram. Soc. 74 (11), 2793–2801 (1991).Google Scholar
10. Mackin, T. J., Warren, P. D., and Evans, A. G., Acta Metall. Mater. 40 (6), 1251–1257 (1992).Google Scholar
11. Warren, P. D., Mackin, T. J., and Evans, A. G., Acta Metall. Mater. 40 (6), 1243–1249 (1992).Google Scholar
12. Mackin, T. J., Yang, J. Y., and Warren, P. D., J. Am. Ceram. Soc. 75 (12), 3358–3362 (1992).Google Scholar
13. Mackin, T. J., Yang, J. Y., Levi, C. G., and Evans, A. G., Mat. Sci. and Eng. A161, 258–293 (1993).Google Scholar
14. Eldridge, J. I. in Intermetallic Matrix Composites II, edited by Miracle, D. B., Anton, D. L., and Graves, J. A. (Mater. Res. Soc. Proc. 273, Pittsburgh, PA, 1992) pp. 325–330.Google Scholar
15. Galbraith, J. M., Interfacial Shear Behavior and Its Influence on Fiber Damage in Sapphire-Reinforced Gamma Titanium Aluminide Composites, Ph.D. Thesis, The Pennsylvania State University, 1993.Google Scholar
16. Kantzos, P. T., Fatigue Crack Growth and Crack Bridging in Ti-Based Metal Matrix Composites, M. S. Thesis, The Pennsylvania State University, 1991.Google Scholar
17. Kerans, R. J. and Parthasarathy, T. A., J. Am. Ceram. Soc. 74 (7), 1585–1596 (1991).Google Scholar
18. Mackin, T. J., University of California, 1992 (private communication).Google Scholar