Abstract
Dispersion-strengthened-cast aluminum (DSC-Al), consisting of a coarse-grained aluminum matrix containing two populations of particles (30 vol.% of 300 nm Al 2O 3 incoherent dispersoids and 0.2–0.3 vol.% of 6–60 nm coherent Al 3Sc precipitates), was studied. At ambient and elevated temperatures, both populations of particles contribute to strengthening. At 300 °C, creep threshold stresses are considerably higher than for control materials with a single population of either Al 2O 3 dispersoids or Al 3Sc precipitates. This synergistic effect is modeled by considering dislocations pinned at the departure side of incoherent Al 2O 3 dispersoids (detachment model) and simultaneously subjected to elastic interactions from neighboring coherent Al 3Sc precipitates.
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