Impact of Synthesized SiC–Al2O3 Nanocomposite on the Structure and Tribomechanical Properties of AK12M2MgN Piston Alloy

Scientific and methodological principles of synthesis of heterophase filler with nanoparticles of SiC, α-Al2O3, Si, Fe are developed on the basis of oxides micropowder and carbide-forming elements. The processed filler, introduced into aluminum melts, provides reinforcement of the aluminum-matrix composites. It is found that the effect of this process is refinement of alloy matrix structure 2–3 times, which leads to increase in the microhardness of the alloy structural phases. It is shown that introduction of 3 wt.% α-phase increases microhardness by 100 MPa and 100–105 MPa at the eutectic point. The samples of the composite material on the base of silumin AK12M2MgN, containing 1–2 wt.% of the composite modifier, have the increased wear resistance 2–4 times higher than the initial alloy samples.