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The influence of severe plastic deformation on hypoeutectic silumin is studied. A positive effect of equal-channel angular pressing with back pressure on the mechanical properties of the AL9 alloy of the Al-Si-Mn-Fe system has been found experimentally. The evolution of the microstructure in the process of deformation is estimated. The effect of short-term intermediate anneals on the microstructure, mechanical properties and ultimate plasticity of the alloy is studied. As a result of additional annealing, significant microstructural changes do not succeed, but the coagulation of excess phases proceeds very intensively, which causes a 20 % increase in strength after the second deformation cycle. Fractographic studies demonstrate the presence of coagulated particles on the samples deformed with the use of short-term intermediate anneals. Limiting plasticity also rises to 0.2 as compared to 0.12 for the samples treated with only ECAP-BP.

EXPERIENCE OF APPLYING SHOT-TERM INTERMEDIATE ANNEALS IN BACK-PRESSURE EQUAL-CHANNEL ANGULAR PRESSING OF ALUMINUM ALLOYS