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Improving the wear resistance of the surface of metal parts used in various industries is one of the
relevant areas of materials science. The aim of this work was a comparative study of the wear resistance
of a sample of an aluminum alloy (EN AW-2024, an aluminum alloy of the Al-Cu-Mg system) modified
with ultrafine particles of minerals using the sclerometry method, which makes it possible to measure
the physicomechanical properties of the material at the microscale, as well as determining some tribological
parameters (hardness and elastic modulus) of a duralumin sample with a mineral coating.
Wear resistance was measured using a NanoScan-4D scanning hardness tester using the multi-cycle
friction method using a sapphire sphere with control of the pressing force and the deepening of the tip into
the sample. The use of such a measurement system is especially important when testing thin modified layers,
when the layer thickness is comparable with the surface roughness parameters and the influence of the
substrate is excluded.
The measurement results showed that the wear resistance of the surface of an aluminum alloy sample
modified with ultrafine mineral particles increased by more than 12 times compared to the wear resistance
of an aluminum alloy surface without modification. Also, measurements of the hardness and elastic modulus
of the surface of the modified sample were performed taking into account the features of measuring the
mechanical parameters of thin layers.
The obtained parameters of the modified surface of the aluminum alloy can be further used to build
models of the processes of friction and wear of the surface modified by ultrafine particles of minerals. The
lack of an acceptable explanation of the nature of the special properties of the surface modified by particles
of minerals of natural origin does not exclude the use of the observed effects to significantly increase the
resource of various parts and mechanisms.
