Creep behavior of SCS-6/Ti-6Al-4V unidirectional composites
Conference
·
OSTI ID:143681
- Air Force Wright Lab., Wright-Patterson AFB, OH (United States)
- Hebrew Univ., Jerusalem (Israel). School of Applied Science
- Univ. of Dayton, OH (United States)
Longitudinal creep tests were conducted in laboratory air at temperatures from 427{degree}C to 760{degree}C on an 8-ply, unidirectionally reinforced silicon carbide SCS-6/Ti-6Al-4V titanium matrix composite. Experimental creep data was compared to a simple uniaxial model for creep, where the fiber is assumed to deform elastically at a rate controlled by creep relaxation of the matrix. Although it is shown that the model can account for much of the measured creep strain, it generally overestimates the creep resistance and cannot account for the minimum and nearly constant creep rates which were observed under high stress and temperature conditions. Acoustic emission (AE) monitoring and post-creep metallographic evaluation were conducted to identify and study damage accumulation during creep. The results indicate that progressive environmental damage occurs to fibers and interfaces on the edges of the composite at creep temperatures as low as 538{degree}C. The rates of damage accumulation and the observed minimum creep rates were found to increase with the applied stress and temperature. The strain which can arise from this fiber damage was considered, and is of sufficient magnitude to explain the increased minimum creep rates which were observed. Final fracture in the composite was associated with an increase in strain rate and frequency of fiber fracture. Results suggest that the final stage of fracture is associated with the localization of damage onto one or more crack planes.
- OSTI ID:
- 143681
- Report Number(s):
- CONF-930246--; ISBN 0-87339-251-5
- Country of Publication:
- United States
- Language:
- English
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