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Relationship between Wear Resistance under Dry Friction and Mechanical Properties of Sintered Al–Sn Composites


The effect of tin-insoluble alloying elements (Zn, Si) on the mechanical and tribotechnical properties of Al–40Sn sintered composites has been studied. Powder mixtures with alloying additives have been sintered at a temperature above the melting point of tin (232°C). Sintered samples have a residual porosity, which negatively affects the strength, ductility, and wear resistance of the composite under dry friction. The hot pressing in a closed die or equal-channel angular pressing (ECAP) at a temperature of 250°C make it possible to reduce the material porosity with a significant increase in the strength and ductility. Regardless of the pressure treatment method, the compacted samples have high wear resistance. The main wear mechanism of the composite consists in the delamination of matrix grains in the surface layer owing to their shear along the tin interlayers in the sliding direction. The shear and peeling of grains are preceded by a strong strain in the surface layer, in the case of which the grain boundaries with tin interlayers are elongated in the sliding direction, that is, a layered structure is formed. Composites having most of the grain boundaries of the aluminum matrix oriented perpendicular to the sliding direction have the maximum wear resistance. A similar structure is formed in the flow plane of the material under the ECAP treatment. It has been found that the wear resistance of the composite with a zinc-alloyed matrix is higher than that with a silicon-alloyed matrix.

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The work was performed according to the Government research assignment for ISPMS SB RAS, project FWRW-2021-0006.

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Correspondence to N. M. Rusin, A. L. Skorentsev or M. G. Krinitsyn.

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Translated by O. Polyakov

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Rusin, N.M., Skorentsev, A.L. & Krinitsyn, M.G. Relationship between Wear Resistance under Dry Friction and Mechanical Properties of Sintered Al–Sn Composites. Inorg. Mater. Appl. Res. 12, 776–784 (2021).

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  • self-lubricating aluminum composites
  • liquid-phase sintering
  • strength
  • ductility
  • wear resistance
  • dry friction
  • deformation treatment