Production method of aluminum - magnesium - lithium alloy product

摘要

(57) Abstract (A) weight % with to consist of Mg of the 3.0-6.0, Li, up to 2.0 Zn, up to 1.0 Mn, up to 0.5 Ag, up to 0.3 Fe, up to 0.3 Si and up to 0.3 Cu of the 0.4-3.0, the 0.02-0.5 Sc of the 0.010-0.40, Hf of the 0.010-0.25 and Ti of 0.0 10-0.25, V of 0.0 10-0.30, ND of 0.0 10-0.20, to be chosen from the group which consists of Zr of the 0.020-0.25, Cr of the 0.020-0.25, Y of the 0.005-0.20, and Be of the 0.0002-0.10, and remainder essentially the aluminum and to prepare the aluminum alloy which consists of the element and the impurity which exist accidentally, (b) this aluminumTo cast the alloy in the ingot, (c) to preheat this ingot, (d) this heat was processed, heat to roll the ingot which you preheat in the intermediate product which (e) this heat both of length and cross direction in cold rolling reduction percentage of 15% total cold to roll the intermediate product which was processed at least in the rolling product, (f) from 465 in the temperature range of the 565C between solution of soaking time of the range of 8 hours to heat-treat this cold rolling product from 0.15, (g) this solution the product which was heat-treated from solution heat treatment temperature at least below the 150C 0.2C/secondIt cools at cooling rate, (h) aging it does the product which was cooled, 260MPa or the smallest yield strength above that and at least in L- and LT- direction 400MPa or with the smallest pull strength above that and L- direction and the so it does with the 45 230MPa or smallest yield strength or 380MPa above that or the smallest pull strength above that with, Outside 1 It consists of the step which offers the seat or sheet product which has the smallest T-L fracture toughness K above _co, production method of the aluminum - magnesium - lithium product.