| 摘要 |
A high strength Al-Mg alloy in plate or extrusion form having significantly improved strength in both soft and work-hardened tempers as compared with AA5083 is provided. The materials have ductility, pitting, stress and exfoliation corrosion resistances equivalent to those of the AA5083. The materials have improved long term stress and exfoliation corrosion resistances at temperatures above 80 ~C. The composition is 5-6 % Mg, 0.6-1.2 % Mn, 0.41.5 % Zn, 0.05-0.25 % Zr, up to 0.3 % Cr, up to 0.2 % Ti, up to 0.5 % each Fe and Si, up to 0.4 % each Cu and Ag, remainder Al and inevitable impurities. Manufacture of plate of this alloy is by homogenizing an ingot, hot rolling the ingot into plate in the range 400-530 ~C, cold rolling the plate with or without inter-annealing, final and optionally inter-annealing of the cold rolled material at temperatures in the range 200-550 ~C.
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