Abstract
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.