The invention relates to an ultrahigh strength
aluminium alloy material and a preparation method thereof. The ultrahigh strength
aluminium alloy material is characterized by comprising the following concrete components in percentage by weight: 12-14% of Zn, 2.4-3.2% of Mg, 1.0-1.5% of Cu, 0.2-0.5% of Zr, 0.1-0.3% of Mn, 0.1-0.6% of Ni and the balance of Al. The preparation method of the ultrahigh strength
aluminium alloy material comprises the following steps:
smelting raw materials, moulding a billet, carrying out
machining deformation on the billet, carrying out
solution treatment for 1 hour at the temperature of 450 DEG C and for 2 hours at the temperature of 475 DEG C, and carrying out manually intervened natural
ageing treatment for 240-360 hours at the temperature of 70-80 DEG C. The ultrahigh strength
aluminium alloy material is prepared by adopting a spray deposition technology, solution strengthening treatment is carried out on alloy, and aging treatment, carried out for 240-360 hours at the temperature of 70-80 DEG C, instead of the traditional natural
ageing treatment is adopted, so that natural
ageing time is shortened, and mechanical properties of the alloy are improved; meanwhile, the developed ultrahigh strength alloy is uniform and tiny in structure, has no macrosegregation and has the performances that tensile strength is 780-820MPa, yield strength is 700-740MPa, elongation percentage is 9-13% and
fracture toughness property is 30-35MPa.m<1 / 2>, so that overall performance of the ultrahigh strength aluminum alloy material is at the international advanced level.