MECHANICAL PROPERTIES AND EVOLUTION OF THE MICROSTRUCTURE OF Al-Cu-Mg SYSTEM ALLOYS UNDER THE INFLUENCE OF ALLOYING ELEMENTS (GE AND SI)

- As the industrial use of aluminum alloys increases, scientists around the world conduct research aimed at improving their properties. This study analyzes the mechanical properties and phase changes of aluminum-copper-magnesium alloys with the addition of germanium and silicon. The samples were liquefied in foundry furnaces and poured into sand-clay molds. The temperature of pouring samples into molds was 750 °C. Germanium oxide and pure silicon were included in the composition of the samples during melting, germanium oxide was added in an amount of 1%, 2%, and 3% of the total weight, and silicon was added in an amount of 5% of the total weight. Cast samples were mechanically processed and tested. The change in hardness from mechanical properties was studied. In addition, microscopic analyses of the samples were carried out and changes in the size of grains constituting the microstructure of the alloy were analyzed. The results of the analysis show that the introduction of germanium and silicon into the composition of the samples reduced the dispersity of the grains of their microstructure and, as a result, increased the hardness. At the end of the article, the authors present the corresponding analysis and conclusions based on the results obtained in the experiments.