| 摘要 |
PROBLEM TO BE SOLVED: To produce an aluminum alloy sheet excellent in impact characteristic and its production, to enable the contribution, in terms of material, to the safety of automobile against collision. SOLUTION: In an aluminum alloy sheet having a composition consisting of, by weight, 0.4-2% Mg, 0.4-2% Si, and the balance Al with inevitable impurities, the average size, in the cross section in a rolling direction, of the crystallized substances crystallized in the alloy sheet is regulated so that it satisfies inequalities (Dl+Dc)/2<=5μm and Dl/Dc<=1.25, where Dl and Dc represent the length of the crystallized substances in a rolling direction and the length of the crystallized substances in a sheet-thickness direction, respectively. By this method, the aluminum alloy sheet excellent in impact characteristic can be obtained.
|
