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The paper deals with the structure, phase and elementary compositions, and tribological behavior of eutectic silumin AK12M2MgN modified by micro- and ultradispersed refractory powder fillers BNAl and SiO2(B,Ti) that are alloyed with elements reactive to aluminum. It is shown that the reinforcement of silumin is accompanied by the formation of nanosized ceramic inclusions AlN, AlB2, TiB2, and α-Al2...