Abstract
During the recent several years it has been well recognized that the creep behavior in discontinuous aluminum and aluminum alloy matrix composites processed by powder metallurgy is associated with a true threshold stress at least up to a temperature of about 700 K. In the present paper, an attempt is made to interpret the disappearance of the true threshold behavior in terms of transition from the athermal to thermally activated detachment of dislocations from fine ``interacting`` alumina particles present in the PM 2124Al-20SiC{sub p} composite matrix.
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