| 摘要 |
Improved 7075 aluminum alloy sheet or plate having a very fine grain structure, and fabricated by processes suitable for use with both wrought or as-cast ingot material, the processes including an intermediate thermal mechanical treatment wherein the ingot, for example, is prehomogenized at a relatively high temperature to precipitate out the chromium and then annealed to precipitate zinc, magnesium and copper out of solution as coarse compounds, the prehomogenization and annealing steps rendering the ingot amenable to one or more subsequent deformation-recrystallization steps to provide additional grain structure refinement.
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