Refined goss-grain aluminum alloy plate and preparation method thereof

A refined Goss-grain aluminum alloy plate, consisting of the following compositions:

• 3.7-4.8 wt % of Cu, 1.2-1.7 wt % of Mg, 0.3-0.8 wt % of Mn, 0.03-0.10 wt % of Ti, and a balance of Al,
• wherein the refined Goss-grain aluminum alloy plate has a Goss texture intensity of not less than 3.9;
• and
• the refined Goss-grain aluminum alloy plate is prepared by a method comprising:
• subjecting an Al—Cu—Mg alloy ingot to a homogenizing, a hot rolling at high temperature with a large deformation and a high final temperature, then directly to a cold rolling with a small or medium deformation, and then to a recrystallization and annealing treatment, a solid solution treatment, a water quenching, and a natural aging treatment, wherein,
• the homogenizing is performed at a temperature of 470-505° C. for 24-96 hours;
• the hot rolling at high temperature with a large deformation and a high final temperature is performed at a temperature of 465-495° C., with a rolling deformation of 80%-98% and a final temperature of not less than 380° C.;
• the cold rolling with a small or medium deformation is performed directly after the hot rolling under a rolling deformation of a single-pass and a multi-pass cold rolling of 5% to 50%;
• the recrystallization and annealing treatment is performed at a temperature of 300-450° C. for 60-300 minutes;
• the solid solution treatment is performed at a temperature of 460-505° C. for 5-90 minutes, and quenched with water;
• the natural aging treatment is performed at ambient temperature for at least 96 hours;
• and
• the refined Goss-grain aluminum alloy plate has a Goss grain size of less than 100 μm.