PROCEDURE FOR PRODUCTION OF ITEM OUT OF HIGH-STRENGTH ALUMINIUM ALLOY Russian patent published in 2010 - IPC C22F1/53 

FIELD: metallurgy.

SUBSTANCE: invention refers to metallurgy and machine building, particularly to procedure of production of items out of high-strength, especially, super-strong aluminium alloys of system Al-Zn-Mg-Cu-Zr used for skin of wing and other power elements of gliders, aircrafts and also for land-based vehicles. The procedure consists in ingot hot rolling, in producing a work-piece, in tempering, in stretch flattening, in preliminary ageing and deformation ageing combined with shaping under a creeping mode. Preliminary ageing is carried out in two stages. At the first stage the work-piece is heated at temperature 95-115°C and conditioned during 3-10 h, at the second stage the work-piece is heated at temperature 120-140°C and conditioned during 2-5 h. Deformation ageing combined with shaping under the creeping mode is performed at temperature 145-165°C and conditioned during 5-10 h at rate of shaping not over 0.5 %/h.

EFFECT: facilitating stable high strength properties of aluminium alloys at sufficient level of corrosion resistance, fracture strength and fatigue strength, which upgrade weight efficiency and resource of item.

2 tbl, 1 ex