Study of the Formation of Films of Secondary Structures Upon Sliding of the “Aluminum Alloy–Steel” Friction Pair/статья
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Дата последнего поиска статьи во внешних источниках: 23 января 2022 г.
Аннотация:The processes, occurring on the contact surface during the friction of the multicomponent antifrictionaluminum alloy Al–20%Sn–5%Si (shoe) against the steel St45 (roller), in particular the effect of selflubrication,are studied. A comprehensive technique for microscopic surface studies is used, including scanningelectron microscopy and scanning probe microscopy. A correlation is established between the dataobtained by the two microscopy methods. Both the initial surface of the samples and the surface after tribologicaltests under extreme friction conditions (without lubrication) are studied. Structural changes of thesurface during friction are evaluated. It is established that during friction, a soft phase component of the alloyis released and the mass transfer of chemical elements from one contact surface to another occurs. Studyingthe surfaces of the contact pair makes it possible to evaluate the specific features of mass transfer between theshoe and the roller. It is revealed that under minimal loading conditions, the self-lubrication effect slightlyappears and there is an intensive transfer of iron from the roller surface to the shoe surface. With an increasein the load (within certain ranges), the release of the soft phase increases significantly, which changes thenature of the surface and the processes occurring on it. It is shown that as a result of complex mechanical andphysical-chemical processes, a film of secondary structures is formed on the contact surface. This film,depending on the friction conditions, can play a different role: not only protecting the surface from destruction,but also contributing to scoring.