Structure and physicomechanical properties of Al–Si alloys

Al-Si alloy samples with a silicon content of 8–15 wt% are grown by the Stepanov method at a solidification rate of 10$^2$ and 10$^3$ $\mu$m/s. The microstructure of the samples is examined, and the stress-strain curves obtained during tension and bending at a strain rate of 10$^{-4}$ s$^{-1}$ are studied. The behavior of Young’s modulus, the modulus defect, and ultrasonic attenuation is investigated. The silicon content in a eutectic structure is found to increase with the solidification rate. The yield strength and the ultimate tensile strength increase with the silicon content up to a eutectic composition. The quality index (which characterizes the strength and plasticity of the material) of Stepanov-grown samples is higher than the quality indices of traditional modified ingots.