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High-Temperature Mechanical Properties of Cr(3+) Doped Sapphire FibersHigh-temperature slow-crack growth of single crystal 10 wt% Cr2O3 - Al2O3 (nominal composition) fibers has been studied by tensile rupture experiments at 1400 C, under different stressing rates (0.5 to 41.5 MPa/s). Slow-crack growth (SCG) is less pronounced with increasing Cr2O3. Rupture stresses increased with the stressing rate from 397 MPa to 515 MPa, resulting in a SCG exponent, N=19. The Cr2O3 composition was analyzed by Energy Dispersed X-Ray Spectra (EDS) and fracture surfaces were studied by scanning electron microscopy (SEM). Results are compared with previous studies on 100-300 ppm Cr3(+) doped sapphire fibers and on commercial sapphire fibers.
Document ID
20020072227
Acquisition Source
Glenn Research Center
Document Type
Preprint (Draft being sent to journal)
Authors
Sayir, A.
(NASA Glenn Research Center Cleveland, OH United States)
QuispeCancapa, J. J.
(Seville Univ. Spain)
deArellanoLopez, A. R.
(Seville Univ. Spain)
Gray, Hugh R.
Date Acquired
August 20, 2013
Publication Date
January 1, 2002
Subject Category
Solid-State Physics
Funding Number(s)
CONTRACT_GRANT: MAT2000-1533-C03-03
CONTRACT_GRANT: NCC3-850
PROJECT: RTOP 708-31-13
CONTRACT_GRANT: F49620-00-1-0048
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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