Abstract
In the present paper, the creep data of Pandey et al. for the composites,with SiC particulates of 1.7 [mu]m in size, are reanalyzed, accepting a value of 5 for the true stress exponent n. The choice of this value of n, approximately equal to that for pure aluminum, is supported by the results of recent analyses of creep data for the 30SiCp-Al6061 and 30SiCp-Al composites for which the minimum creep strain rates, covering seven orders of magnitude, were measured. The authors show that with n = 5, the threshold stress, decreasing with increasing temperature, is generally associated with the creep of discontinuous aluminum alloy matrix composites, and that the high values of the apparent activation energy of creep can be accounted for only by the threshold stress decreasing with increasing temperature.
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