Influence of melting and filtration processes on the structure and mechanical properties of aluminum alloys

In the article are presented the results of the study on the applied upgrading processes such as refining, modification and filtration of the near eutectics alloy EN AC- 44000, AlSi11, (AK11), cast into the chill. The upgrading processes applied to the said alloy caused, in comparison to the alloy which was not upgraded, significant differences in the shape of the crystallization curves, obtained in the graphic record of the ATD-AED method. It was demonstrated the existence of connections between the thermal and electric phenomena during solidification and crystallization of the studied silumin. The obtained results of the metallographic analysis showed the occurrence of the impurities within the alloy structure in the form of porosity and oxides following the metallurgical processing (in pig sows). The primary studies on microstructure of the cast ceramic filters have demonstrated the purposefulness of introduction of the filtration process to the technology of aluminum alloys manufacturing. The microstructures of the filters cast with the studied alloys illustrate the extent and deployment of the impurities retained (in the filter) during the process of samples casting for measurement of the mechanical strength properties. On the example of the near eutectics alloy AK11, it has been demonstrated, that in comparison to the refined alloy there is a possibility to obtain significant improvement of mechanical properties, and especially elongation A5 and impact strength KCV.