THERMOMECHANICAL PROCESSING FOR INCREASE IN DUCTILITY OF 3D SEMIS FROM Al-Cu-Mg-Ag ALLOYS Russian patent published in 2014 - IPC C22F1/57 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly, to processing of semis from Al-Cu-Mg-Ag alloys to form therefore the 3D parts to be used in aerospace and aircraft engineering. Proposed process comprises deformation of homogenised and machined ingots by equal-channel angular extrusion at 380-450°C in one-two passes to true degree of deformation (ε) ~1-2. Quenching in water is performed at 500-530°C for 1-5 hours. Heterogeneous annealing is performed at 400-450°C for 3 hours. Subsequent controlled cooling is performed at the rate of 50°C/t to 280-380°C and further cooling inside switched-off furnace to 25-100°C for not over 12 hours.

EFFECT: higher ductility and mouldability.

5 cl, 2 ex, 1 tbl