Hostname: page-component-7bb8b95d7b-nptnm Total loading time: 0 Render date: 2024-09-13T03:50:21.379Z Has data issue: false hasContentIssue false
  • English
  • Français

Heat Treatments and Thermal Fatigue of Scs-6/Alpha-2 Titanium Aluminide Composites

Published online by Cambridge University Press:  21 February 2011

Y-W. Kim  and
J. Kleek
Y-W. Kim
Affiliation:
Metcut-Materials Research Group, P.O. Box 33511, Wright-Patterson Air Force Base, OH 45433-0511
J. Kleek
Affiliation:
Wright Research and Development Center, Materials Laboratory, WRDC/MLLS, Wright-Patterson Air Force Base, OH 45433-6533
Get access

Abstract

Panel composites made of alpha-2 titanium aluminide (Ti-25A1-9Nb-1.6Ta-1.6Cr-lMo) foils and SCS-6 (SiC with carbon core and carbon double coatings) fibers were investigated to determine the influence of postprocessing heat treatments on the thermal fatigue behavior in air. The 4-ply composite panels with 22 vol% fiber showed no edge cracks after 1000 thermal cycles between 150°C and 816°C in alpha+beta or beta-solution plus isothermal-aging treatments. The thermal cycling, however, embrittled the fiber carbon core and coatings in the composites given post-processing heat treatments, with the degree of embrittlement increasing progressively with heat treatment temperature/exposure. The detrimental effects of heat treatments on the matrix were also observed in that beta treatments reduced both the strength and tensile ductility of the matrix alloy when compared with alpha+beta treatments.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 194: Symposium R – Intermetallic Matrix Composites I , 1990 , 315
Copyright
Copyright © Materials Research Society 1990

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. Brindley, P. K., Bartolotta, P. A., and Klima, S. J., ”Investigation of a SiC/Ti-24AI-11Nb Composite,” NASA Technical Memorandum 100956, 1988.Google Scholar
2. Smith, P. R., Rhodes, C. G., and Revelos, W. C., in Interfaces in Metal-Ceramics Composites, Part I-Thermodynamics and Kinetics, edited by Lin, R. Y. et al. (TMS, Warrendale, PA, 1990), pp. 35–58.Google Scholar
3. Cox, B. N., James, M. R., Marshall, D. B., and Addi, R. C., “Determination of Residual Stresses in Thin Sheet Titanium Aluminde Composites,” submitted to Met. Trans. A, 1989.Google Scholar
4. Russ, S. M., ”Thermal. Fatigue of Ti-24AI-llNb/SCS-6,” Met. Trans., in print, 1990.Google Scholar
5. Smith, P. R. and Revelos, W. C., ”Environmental Aspects of Thermal Fatigue in an SCS-6/Ti-24A1-llNb Composite,” to be presented at the Fourth International Conference on Fatigue and Fatigue Threshold (Fatigue '90), Honolulu, Hawaii, 15-20 July 1990.Google Scholar