Abstract
In this work, aluminum multicomponent alloys were studied after friction with steel in a mixed lubrication regime. The resulting secondary structures on the friction surface were investigated by scanning electron microscopy (SEM), energy dispersive analysis (EDX), X-ray photoelectron spectroscopy (XPS), and X-ray diffraction analysis (XRD). In addition to the mass transfer of steel counterbody particles, phase transformations and new chemical compounds formed as a result of interaction with the lubricant were revealed. The release of elements, mainly magnesium and to a lesser extent zinc, from a solid solution of aluminum alloy was also observed, which indicates the occurrence of a non-spontaneous reaction with a negative entropy production.
Highlights
Lead and tin-lead bronzes remain the most widely used material for monometallic journal bearings due to a combination of mechanical and tribological properties [1,2,3]
As follows from the theory of self-organization, the processes that occur during friction can lead
Secondary structures formed on the friction surface of experimental aluminum alloys rubbing with steel in mixed lubrication regime were studied
Summary
Lead and tin-lead bronzes remain the most widely used material for monometallic journal bearings due to a combination of mechanical and tribological properties [1,2,3]. Of the world’s energy is spent on overcoming friction forces and their consequences [4,5,6], the transition from bronze to aluminum-based alloys can become a driver for the development of the engine-building industry due to significant cost reduction of bearing manufacturing and further repair. Aluminum is three times lighter than copper, and its specific cost is 2.5–2.7 times less, it is easier to process, and its casting requires 15–20% less energy. Additional chemical-thermal treatment of steel shafts might be avoided. These advantages provoke a great interest in anti-friction alloys [8,9,10,11,12,13,14]
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