Compressive creep of mullite containing Y{sub 2}O{sub 3}.
Journal Article
·
· Acta Materialia
Compressive creep of mullite and mullite containing 5 and 9 wt% Y{sub 2}O{sub 3} has been investigated in the temperature range of 1300-1400 C over stresses between {approx}0.6 and 40 MPa in air. The nominally single-phase mullite deforms by diffusional flow with a stress exponent of 1 (for higher stresses) and an activation energy of 385{+-}20 kJ/mol. It is likely that the rate-controlling diffusing species is oxygen. Creep of the Y{sub 2}O{sub 3}-containing specimens was similar to that of the pure mullite at 1300 C. Near and above the temperature at which melting was observed in DTA, the Y{sub 2}O{sub 3}-containing specimens crept significantly faster than the pure mullite. Models of creep of materials that contain a glass phase can explain most, but not all, of the observed behavior. Creep rates were not significantly affected by partial crystallization of the glass to Y{sub 2}Si{sub 2}O{sub 7}, but the crystallized specimens exhibited cavitation at larger strains.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- FOR; DOD
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 949517
- Report Number(s):
- ANL/ET/JA-41668
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 17 ; Oct. 9, 2002 Vol. 50; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- ENGLISH
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