FIELD: non-ferrous metallurgy; production of large-sized semi-finished items from aluminum alloys by molding methods.
SUBSTANCE: proposed method includes casting of ingots, homogenization, cooling, heating at isothermal holding at heat, deformation at temperature of isothermal holding, hardening and aging. Subjected to treatment are aluminum alloys containing zirconium and titanium at ratio found from the following expression: 0.12≤Ti/(Ti+Zr)≤0.4. Homogenization is carried out at solidus temperatures and is continued for 2-36 h. Items are cooled to room temperature at rate of 10-30°C/h. Then, items are heated to temperature of 340-410°C and are subjected to isothermal holding at heat for 24 h.
EFFECT: enhanced strength and plasticity characteristics of molded large-sized items; enhanced resistance to corrosion cracking; increased good-to-bad yield due to reduction of internal defects.
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