STRUCTURE AND PROPERTIES OF SILUMIN SUBJECTED TO ELECTROEXPLOSIVE AL-LOYING WITH Y2O3 POWDER

10.25712/ASTU.1811-1416.2025.02.001

Abstract

Al-Si alloys are indispensable in various industries such as aerospace and automotive due to their high strength-to-weight ratio, excellent thermal conductivity and corrosion resistance. These alloys often contain elements such as Si, Cu, Mg and Zr to improve their properties, and special formulations can increase strength, wear resistance and improve the grain structure. The aim of this work was to study the structure and tribological properties of hypereutectic silumin in the cast state and after electroexplosive alloying with Y₂O₃ powder. Using micro-X-ray spectral analysis, the multi-element composition of the surface layer of silumin subjected to electroexplosive alloying was revealed, and it was also found that alloying leads to the formation of a morphologically complex multilevel multiphase structure in the surface layer, the main chemical elements of which are aluminum, titanium, yttrium and oxygen. Tribological tests of silumin, performed under dry friction conditions at room temperature, showed that electroexplosive alloying leads to a decrease in the wear parameter (increase in wear resistance) of silumin by 2.2 times; the average value of the material friction coefficient increases from 0.51 in the cast state to 0.6 after electroexplosive alloying. The friction coefficient of silumin in the cast state after 80 seconds of testing reaches a stationary level and practically does not change further. After electroexplosive alloying, the stationary state of the friction coefficient is recorded only after 2000 seconds of testing. The first 2000 seconds of testing, the friction coefficient gradually increases from 0.16 to 0.55.