초록 ▼

A method for making a superplastically formable, aluminum alloy product which consists essentially of: about 2-3.8 wt. % magnesium; at least one dispersoid-forming element selected from the group consisting of: up to about 1.6 wt. % manganese, up to about 0.2 wt. % zirconium, and up to about 0.3 w.

A method for making a superplastically formable, aluminum alloy product which consists essentially of: about 2-3.8 wt. % magnesium; at least one dispersoid-forming element selected from the group consisting of: up to about 1.6 wt. % manganese, up to about 0.2 wt. % zirconium, and up to about 0.3 w. % chromium; at least one nucleation-enhancing element for recrystallization selected from: about 0.11-1.0 wt. % silicon, up to about 1.5 wt. % copper, and combinations thereof. Said alloy product has greater than about 300% elongation at a strain rate of about 0.0001-0.003/sec and a superplastic forming temperature between about 1000-1100.degree. F. due, in part to the preferred thermomechanical processing steps applied to its intermediate plate or slab product forms.

대표청구항 ▼

[ What is claimed is:] [14.]14. A method for making a superplastically formable, sheet product from an aluminum alloy containing about 2-3.8 wt. % magnesium, and at least one dispersoid-forming element selected from the group consisting of: up to about 1.6 wt. % manganese, up to about 0.2 wt. % zirc

[ What is claimed is:] [14.]14. A method for making a superplastically formable, sheet product from an aluminum alloy containing about 2-3.8 wt. % magnesium, and at least one dispersoid-forming element selected from the group consisting of: up to about 1.6 wt. % manganese, up to about 0.2 wt. % zirconium, and up to about 0.3 wt. % chromium; and about 0.11-1.0 wt. % silicon, said method comprising the steps of:(a) hot rolling the alloy to form a plate or slab;(b) solution heat treating the plate or slab at one or more temperatures between about 1000-100.degree. F.;(c) rapidly quenching said plate or slab;(d) without any annealing, cold rolling said plate or slab to form a sheet product therefrom;(e) subjecting said sheet product to high temperature superplastic forming;(f) cooling said sheet product;(g) solution heat treating said sheet product at one or more temperatures above the solvus temperature; and(h) cooling said sheet product.