DEFORMED ALUMINUM ALLOYS ARTICLES FORMING METHOD Russian patent published in 2007 - IPC C22F1/04 

FIELD: metallurgy, namely processes for making articles of deformed aluminum alloys including large-size articles with large cross sections and complex shapes.

SUBSTANCE: method comprises steps of homogenizing ingot; cooling it, heating till temperature of preliminary plastic deformation; performing preliminary plastic deformation; heating blank till temperature of final plastic deformation; realizing final plastic deformation at desired temperature and subjecting blank to heat treatment. Before heating article for final plastic deformation, blank is heated till temperature 450 - 480°C and then it is soaked at such temperature for time period sufficient for dissolving excess eutectic and secondary phases. Further cooling is realized at rate no less than 100°C/h till temperature that is by 20 -70°C less than temperature Ti (Ti - temperature of minimum stability of solid solution). In concrete variants of invention ingot homogenization is realized at temperature 300 - 470°C/h for soaking period 3 - 42 h at heating rate no more than 50°C till soaking temperature.

EFFECT: improved quality of products of deformed aluminum alloys due to enhanced set of strength properties, improved tensile strength, corrosion resistance, lowered trend to inter-crystallite corrosion.

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