Autors: Kandeva, M. K., Dochev, B. A., Zagorski, M. H., Dimova, D. P., Kasabov P., Tsonev, V. C.
Title: INVESTIGATION OF THE INFLUENCE OF THE STRUCTURE ON THE ROUGHNESS CLASS, MICROHARDNESS, MACROHARDNESS, AND WEAR RESISTANCE OF ALUMINIUM-SILICON ALLOYS
Keywords: aluminium-silicon alloys, boundary layer smear wear, friction pairs, roughness

Abstract: The object of the present study is non-standardized hypereutectic aluminium-silicon alloys (AlSi25Cu4Cr, AlSi25Cu5Cr, AlSi21Cu5MgCr, AlSi21Cu5Cr). The alloys are obtained by using different melting technologies. The alloys are modified using phosphorus. The alloys were subjected to T6 heat treatment at different time-temperature regimes of artificial aging. The specimens were machined using various metal cutting tools. A microstructural analysis was carried out, and the roughness class of the surfaces after mechanical processing, the alloys’ microhardness, and the alloys’ microhardness of the α-solid solution in the structure of the compositions were measured. The wear of contact systems (tribosystems) composed of the studied alloys in the boundary lubrication mode during reversible reciprocating movement was investigated. The studied samples are from the alloys AlSi25Cu4Cr and AlSi25Cu5Cr, and the antibodies are from the compositions AlSi21Cu5MgCr and AlSi21Cu5Cr. Results were obtained for each specimen’s mass wear, wear intensity, wear resistance, counter body, and overall for the tribosystems. It was established that the technological process for the production of the alloys directly affects the structures of the compositions, the surface roughness after mechanical processing, and the micro-and microhardness of the alloys. The results of the tribological studies show that the wear characteristics depend on the structures of the alloys.

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Issue

Journal of the Balkan Tribological Association, vol. 31, pp. 439-445, 2025, Albania, ISSN 13104772

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