Abstract
The effect of stress and temperature on the steady state creep rate of SiCw/2124 Al (T4) has been determined. The stress exponent for steady state creep of the composite is shown to increase from a value of 8.4 at 177 °C to a value of 21 at 288 °C. The activation energy for creep was determined to be 277 kJ/mol for testing in the temperature range from 149 to 204 °C and 431 kJ/mol for testing from 274 to 302 °C. These values are much greater than that for self-diffusion in aluminum. Such a severe temperature and stress dependence of the steady state creep rate is characteristic of precipitation and oxide dispersion strengthened nickel-base superalloys, where the creep behavior is explained by the particle strengthening contribution being a significant fraction of the applied creep stress. In contrast, the estimated particle strengthening for the composite is much less than the applied creep stresses. Alternate strengthening mechanisms are proposed to account for the observed creep behavior of the composite material, including the effect of temperature on the measured values of the stress exponent and activation energy for creep.
Similar content being viewed by others
References
A. P. Divecha and S. G. Fishman: inProc. of 3rd Int. Conf. on Me- chanical Behavior of Materials, K. J. Miller and R. F. Smith, eds., Pergamon Press, New York, NY, 1980, pp. 351–61.
A. P. Divecha, S. G. Fishman, and S. D. Karmarker:J. Metals, Sept. 1981, pp. 12-17.
M. D. Skibo: Sandia Laboratories Report SAND81-8212, June 1981.
T. G. Nieh and R. F. Karlak:J. Mat. Sci. Letters, 1983, vol. 2, pp. 119–22.
D. L. McDanels and C. A. Hoffman: NASA Technical Paper 2302, 1984.
D. F. Hasson, S. M. Hoover, and C. R. Crowe:J. Mat. Sci., 1985, vol. 20, pp. 4147–54.
S. V. Nair, J. K. Tien, and R. C. Bates:Int. Met. Reviews, 1985, vol. 30, pp. 275–90.
D. Webster:Metall. Trans. A, 1982, vol. 13A, pp. 1511–19.
T. G. Nieh:Metall. Trans. A, 1984, vol. 15A, pp. 139–46.
V. C. Nardone and K. M. Prewo:Scripta Metall., 1986, vol. 20, pp. 43–48.
V. C. Nardone and J. K. Tien:Scripta Metall., 1986, vol. 20, pp. 797–802.
P. W. Davies, G. Nelmes, K. R. Williams, and B. Wilshire:Met. Sci. J., 1973, vol. 7, pp. 87–92.
K. R. Williams and B. Wilshire:Met. Sci. J., 1973, vol. 7, pp. 176–79.
J. K. Parker and B. Wilshire:Met. Sci., 1975, vol. 9, pp. 248–52.
S. Purushothaman and J. K. Tien:Acta Metall., 1978, vol. 26, pp. 519–28.
Aluminum Standards and Data, The Aluminum Association, Wash- ington, DC, 1984.
R. J. Arsenault:Mat. Sci. Eng., 1984, vol. 64, pp. 171–81.
V. C. Nardone and J. K. Tien:Scripta Metall., 1983, vol. 17, pp. 467–70.
V. C. Nardone, D. E. Matejczyk, and J. K. Tien:Acta Metall., 1984, vol. 32, pp. 1509–17.
Aerospace Structural Metals Handbook, Metals and Ceramics Infor- mation Center, Columbus, OH, Syracuse University Press, 1984.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Nardone, V.C., Strife, J.R. Analysis of the creep behavior of silicon carbide whisker reinforced 2124 Al(T4). Metall Trans A 18, 109–114 (1987). https://doi.org/10.1007/BF02646227
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02646227