Abstract
The Wright Laboratory Materials Directorate at Wright-Patterson AFB has been spearheading the development and evaluation of a new class of metal matrix composites based upon continuous SiC fiber reinforcement of orthorhombic phase containing titanium aluminide matrices. These composites (O TMCs) will be subjected to thermal exposures during primary and secondary component processing, and possibly also during heat treatments to optimize matrix-dominated mechanical performance. Such thermal excursions must not degrade the SiC fiber reinforcement, hence compromising resulting composite properties. Therefore, the effects of heat treatment on the room temperature tensile strength of continuous SiC fibers were studied. The fibers examined included: Trimarc 1®, SCS-6, Ultra SCS and an experimental large diameter version of Ultra SCS. The fibers were heat treated below and above the beta solvus temperature of the orthorhombic matrix alloy utilized for this study, Ti-22Al-23Nb (at%). The fibers were evaluated for ambient temperature tensile strength in the following conditions: (1) as-received: (2) heat treated in vacuum; and (3) consolidated into Ti-22Al-23Nb, heat treated in vacuum, and chemically extracted. Fiber microstructure and fracture analysis was accomplished via secondary scanning electron microscopy (SEM). Chemical reactions between fiber core and the SiC, and between the SiC fiber and the Ti-22Al-23Nb matrix, were also studied by SEM.
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P. R. Smith, J. A. Graves and C. G. Rhodes, in “Structural Intermetallics,” edited byR. Darolia et al. (TMS, Warendale, PA, 1993) pp. 765–771.
P. R. Smith, J. A. Graves and C. G. Rhodes, in “Intermetallic Matrix Composites II,” edited byD. B. Miracle, D. L. Anton, and J. A. Graves, Vol. 273 (MRS Sym Proc., Pittsburgh, PA, 1994) pp. 43–52.
D. B. Miracle, P. R. Smith and J. A. Graves, in “Intermetallics Composites III,” edited byJ. A. Graves, R. R. Bowman, and J. J. Lewandowski, Vol. 350 (MRS Sym Proc., Pittsburgh, PA, 1994) pp. 133–142.
J. A. Graves, P. R. Smith and C. G. Rhodes, in “Intermetallic Matrix Composites II,” edited byD. B. Miracle, D. L. Anton, and J. A. Graves, Vol. 273 (MRS Sym Proc., Pittsburgh, PA, 1994) pp. 31–42.
P. R. Smith and W. J. Porter, “The effect of a postconsolidation heat treatment on the tensile and creep behavior of neat matrix Ti-22Al-23Nb,” submitted to J. Mater. Sci.
K. Krishnamurthy and D. B. Miracle, “On the role of carbon diffusion during fiber/matrix reaction in SiC fiber reinforced Ti-based MMCs,” to be presented at Eleventh International Conference on Composite Materials (ICCM-11), Gold Coast, Queensland, Australia, 14-17 July 1997 (published in proceedings).
M. L. Gambone and F. E. Wawner, in “Intermetallics Composites III,” edited byJ. A. Graves, J. A. Graves, R. R. Bowman and J. J. Lewandowski, Vol. 350 (MRS Sym Proc., Pittsburgh, PA, 1994) pp. 111–118.
C. G. Rhodes, J. A. Graves, P. R. Smith and M. R. James, in “Structural Intermetallics,” edited byR. Darolia et al. (TMS, Warendale, PA, 1993) pp. 45–52.
I. M. Sukonnik, P. R. Smith, J. A. Graves, C. G. Rhodes, M. C. Shaw, S. Krishnamurthy and A. Pandey, in Proc. Titanium Matrix CompositesWorkshop, edited byP. R. Smith and W. C. Revelos, Report No. WL-TR-92-4035, Materials Directorate, Wright Laboratory,WPAFB, OH, April 1992, pp. 98–114.
V. Fry, Advanced chemical vapor deposition (CVD) fibers for metal matrix composites, Report No. WL-TR-93-4050, Materials Directorate, Wright Laboratory, WPAFB, OH, April 1993.
M. L. Gambone, Materials Directorate, WPAFB, OH, unpublished research, 1996.
P. R. Smith, C. G. Rhodes and W. C. Revelos, in Proc. Titanium Aluminide Composite Workshop, edited byP. R. Smith, S. J. Balsone, and T. Nicholas, Report No. WL-Tr-91-4020, Materials Directorate, Wright Laboratory,WPAFB, OH, Feb. 1991, pp. 178–201.
C. G. Rhodes, in “Intermetallic Matrix Composites II,” edited byD. B. Miracle, D. L. Anton, and J. A. Graves, Vol. 273 (MRS Sym Proc., Pittsburgh, PA, 1994) pp. 17–31.
M. L. Gambone and D. B. Gundel, in Proc. CMMC'96, San Sebastian, Spain (Sept. 1996).
X. J. Ning, P. Pirouz and K. P. D. Lagerlof, J. Mater. Res. 5 (12) (1990) 2865–2876.
X. J. Ning and P. Pirouz, J. Mater. Res. 6 (10) (1991) 2234–2248.
F. E. Wawner, in “Fibre Reinforcements for Composite Materials,” edited byA. R. Bunsell (Elsevier Science Publishers, N. Y., 1988) pp. 371–425.
S. R. Nutt and F. E. Wawner, J. Mater. Sci. 20 (1985) 1953.
J. D. Casey and J. Geller, in Proc. Titanium Aluminide Composite Workshop, edited byP. R. Smith, S. J. Balsone, and T. Nicholas, Report No. WL-Tr-91-4020, Materials Directorate, Wright Laboratory, WPAFB, OH, Feb. 1991, pp. 59–72.
M. L. Gambone, D. B. Gundel and F. E. Wawner, in Proceedings of 17th Conference on Metal Matrix, Carbon, and Ceramic Matrix Composites, NASA Conf. Pub. # 3225, Part 1, May 1994, 235–252.
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Smith, P.R., Gambone, M.L., Williams, D.S. et al. Heat treatment effects on SiC fiber. Journal of Materials Science 33, 5855–5872 (1998). https://doi.org/10.1023/A:1004478804694
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DOI: https://doi.org/10.1023/A:1004478804694