| 摘要 |
<p>The present invention provides an aluminum alloy sheet for forming which is a high-Mg-content Al-Mg alloy sheet reduced in ß-phase precipitation and improved in press formability. This aluminum alloy sheet for forming comprises an Al-Mg alloy containing 6.0-15.0 mass% Mg. In each of square regions, each side of which has the dimension of the whole sheet width (W), that are set in a surface of the alloy sheet, the concentration of Mg is measured at sheet-width-direction measurement points, Px, set at given intervals a and b respectively in the sheet-width direction and the sheet-length direction, and the average of the values of Mg concentration measured at the plurality of sheet-width-direction measurement points (Px) is taken as a sheet-width-direction average Mg concentration (Co). The concentration of Mg is measured at a plurality of sheet-thickness-direction measurement points (Py) set at a given interval in the sheet-thickness direction throughout the whole sheet thickness with respect to the plurality of sheet-width-direction measurement points (Px), and the average of the values of Mg concentration measured at the plurality of sheet-thickness-direction measurement points (Py) is taken as a sheet-thickness-direction average Mg concentration (Ci). The absolute value of the degree of regional Mg segregation (X) defined by the difference (Ci-Co) between the sheet-thickness-direction average Mg concentration (Ci) and the sheet-width-direction average Mg concentration (Co) is 0.5 mass% or less at most and is 0.1 mass% or less on average.</p> |
