Steady-state creep of a particulate SiC/6061 Al composite
The creep behavior of a 10 vol.% silicon carbide particulate reinforced 6061 Al composite produced by powder metallurgy (PM) has been examined by creep tests in both tension and compression at 400 C. The tensile creep data covering minimum creep rates of the orders 10{sup {minus}9} to 10{sup {minus}4}/s show an apparent stress exponent n{sub app} {approx} 13, but a comparison with compressive creep data reveals that some high strain-rate data in tension are due to the transition to the tertiary stage. Analysis of the data is made only for the steady-state creep rate, together with that for an unreinforced PM 6061 Al alloy, by incorporating a threshold stress. This gives a stress exponent n = 3 for the matrix alloy, whereas the composite data show such a trend that the n value gradually changes from 3 to 1 as the effective stress increases. A new method of steady-state creep data analysis is formulated by taking account of the interface-confined diffusional flow and thereby the finding above is reasonably assessed.
- Research Organization:
- Tokyo Inst. of Tech., Midori, Yokohama (JP)
- OSTI ID:
- 20015588
- Journal Information:
- Acta Materialia, Vol. 48, Issue 4; Other Information: PBD: 25 Feb 2000; ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
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