| Abstrakt: |
The effect of annealing at 400‡ C on the microstructure of a cold-worked Al-0.8 wt % Zr alloy is reported. It is shown that the initially high dislocation density in the cold-rolled material is progressively reduced, although the grains and subgrains were exceptionally resistant to coarsening. Precipitation of the metastable cubic Al3Zr phase occurred, both discontinuously in the form of fan shaped precipitates and also on the grain boundaries and within the grains as small, nearly spherical particles. The mechanical properties of the alloy at 400‡ C are consistent with a major dislocation contribution to the overall deformation process, in contrast with most other fine grained materials which are superplastic. |
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