Abstract
Most precipitation-strengthened aluminum alloys currently being used are limited to relatively low temperature usage, because of the dissolution and/or rapid coarsening of their precipitates. Two-phase Al(Sc) alloys represent an exception, because they contain very fine coherent cuboidal Al{sub 3}Sc precipitates, faceted on {l_brace}100{r_brace} planes, with a melting temperature of 1,320 C and very low coarsening rates. Much of the recent work on high temperature mechanical properties of Al(Sc) alloys has focused on diffusional creep and superplastic deformation with fine recrystallized grains. The purpose of this report is to explore the dislocation creep behavior of coarse-grained binary Al(Sc) alloys and to discuss the strengthening effect of the Al{sub 3}Sc phase.
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