The effect of external actions on a molten metal and the influence of nonmetallic nanoparticles on the structure and mechanical properties of the light alloys based on aluminum and magnesium

In this paper, the studies of the effect of aluminum and magnesium alloys' structures, which are dispersion-hardened by nanosized ceramic particles, on their mechanical characteristics are carried out. The influence of the aluminum oxide particles' concentration ranging from 0.1 to 1 wt% per grain structure on the microhardness and mechanical tensile behavior of pure aluminum is shown. It is found that with an increase in the nanosized alumina concentration from 0.1 to 1 wt% in the structure of aluminum, the tensile strength increases from 49 up to 79 MPa, and the yield strength increases from 12 up to 27 MPa in the tested samples. The impact of the dispersion of titanium diboride particles on the structure and mechanical behavior of AMg5 alloy is studied. It is revealed that the maximum grain refinement and increase in the tensile mechanical properties are observed when the titanium diboride particles of the size from 50 nm to 3 $\mu$m are used for the alloying of AMg5. The magnesium alloys ML12 hardened by 1.5 wt% particles of aluminum nitride are studied. It is found that the introduction of the aluminum nitride particles into a magnesium melt contributes to a decrease in the average grain size from $\sim$ 1270 to 85 $\mu$m in the obtained castings and, as a result, to an increase in the mechanical properties.