Microstructure and Mechanical Properties of Hypereutectic Al-Si Alloys Subjected to Magnetodynamic Treatment

The melt treatment in the magnetodynamic apparatus using the ARSAL refining flux and modification of phosphorous copper were applied to hypereutectic Al-Si alloys to investigate their structural changes and properties. It was shown that such treatment of the melt in the magnetodynamic installation using the ARSAL refining flux and properly chosen heat treatment of the solidificated alloys allows us to refine primary silicon particles, reduce segregation of alloying elements, increase the supersaturation of solid solution, to enlarge the volume fraction of the nanoparticles formed during the aging process. As a result, the strength characteristics are increased: tensile strength σ_B increases from 322 MPa in the initial state to 353 MPa, yield strength σ_T-from 280 MPa to 317 MPa and elongation δ increases from 0.78 to 1.55%.