Autors: Kandeva, M. K., Dochev, B. A., Zagorski, M. H., Dimova, D. P., Kasabov P., Tsonev, V. C.
Title: STATIC FRICTION IN TRIBOSYSTEMS COMPOSED OF ALUMINIUM-SILICON ALLOYS
Keywords: eutectic and hypereutectic aluminium-silicon alloys, static and kinetic coefficients of friction

Abstract: This work presents the characteristics of static friction in tribosystems composed of aluminium-silicon alloys under varying normal loads, in the presence of a lubricant. Specifically, static and kinetic friction forces, static and kinetic coefficients of friction (COF), and the difference between static and kinetic COF (Stick-slip) are investigated. The studied bodies are from alloys with hypereutectic compositions (AlSi21Cu3CrMn, AlSi25Cu4Cr, and AlSi25Cu5Cr), and the counter bodies are from complex alloyed eutectic alloys (AlSi12Cu5MgCr and AlSi12Cu5Mn) and hypereutectic alloys (AlSi21Cu5MgCr and AlSi21Cu5Cr). The hypereutectic alloys are modified with phosphorus. The AlSi12Cu5MgCr alloy is a complex modification with beryllium, titanium, boron, and phosphorus, and the AlSi12Cu5Mn alloy is modified with titanium, boron, and strontium. The alloys were subjected to T6 heat treatment at different time-temperature regimes of artificial aging. The obtained results of the research of the presented tribosystems show that the static and kinetic friction forces, the static and kinetic coefficients of friction (COF) and the difference between the static and kinetic COF (Stick-slip) directly depend on the roughness of the surfaces after mechanical processing, from the structure of the alloys and their mechanical properties (macro and microhardness). When using the normal load (P) with small values, the factor that has a more significant influence on the studied parameters is the roughness of the surfaces, and with larger values of P, the structure, the microhardness of the alloys and the microhardness of the α-solid solution in the structure of the material. The creation of tribological pairs of hypereutectic aluminium-silicon alloys is appropriate because the obtained values of static and kinetic coefficients of friction (COF) and the difference between static and kinetic COF (Stick-slip) are comparable to those of systems composed of eutectic and hypereutectic compositions.

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Issue

Journal of the Balkan Tribological Association, vol. 31, pp. 149-159, 2025, Albania, ISSN 13104772

Вид: статия в списание, публикация в реферирано издание, индексирана в Scopus