| 摘要 |
PROBLEM TO BE SOLVED: To provide an Al alloy sheet having higher proof stress and moreover having excellent press formability and hem workability for lightening a transport. SOLUTION: This aluminum alloy material has a compsn. contg., by mass, 0.2 to 1.6% Mg, 0.2 to 1.8% Si and 0.01 to 0.30% Mn, in which the content of Fe is controlled to <=0.30%, and the balance Al with inevitable impurities, and in which the average crystal particle size of recrystallzed particles in the microstructure after solution heat treatment is <=45μm, the average size of Al-Fe and Mg2Si crystallized products is <=5μm, furthermore, the average spacing between the crystallized products is >=20μm, moreover, the average size of the dispersed particles is 0.02 to 0.8μm, and the number thereof per unit volume is >=1 piece/m3.
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