Aluminum alloy sheet for high-speed train structure and manufacture thereof

The invention relates to an aluminum alloy sheet for a high-speed train structure and a manufacture thereof, in particular to an aluminum alloy sheet and a manufacture thereof. The sheet of the invention is prepared from the following elements: Zn, Mg, Mn, Cr, Zr, V, Cu, Si, Fe, Ti and Al. The preparation method comprises the following steps of: (1) weighting raw materials; (2) melting; (3) casting; (4) homogenized annealing; (5) hot rolling; (6) cold rolling; (7) quenching; and (8) one-stage ageing treatment. The aluminum alloy sheet for the high-speed train structure has the tensile strength of 410-425 Rm/N/mm , the yield strength of 360-382 RP0.2/N/mm and the elongation rate of 12.2-13.4 percent.