ON THE POSSIBILITY OF CREATING HEAT RESISTANT ALUMINUM DEFORMABLE ALLOYS BASED ON THE Al–Cu–Mn–Ni SYSTEM WITHOUT THE USE OF HARDENING HEAT TREATMENT

The phase composition of ingots and hot-rolled sheets of alloys in the Al–Cu–Mn–Ni system, containing 6–8% Cu, 2% Mn, and up to 4% Ni (mass %), was analyzed. A structure for the phase diagram in the aluminum region is proposed, according to which in the solid state there may be three four-phase areas involving a solid solution based on aluminum and various intermetallic compounds. The possibility of creating heat-resistant deformable aluminum alloys, whose structure consists of an aluminum matrix containing Al₂₀Cu₂Mn₃ dispersoids and eutectic phases such as Al(Cu,Ni), has been substantiated.