https://doi.org/10.1140/epjp/s13360-024-05251-7
Regular Article
Simultaneous effect of grain size and indenter dimension on the dislocation nucleation and growth in nanoindentation and nanoscratch processes
Mechanical Rotary Equipment Research Department, Niroo Research Institute (NRI), Tehran, Iran
Received:
19
September
2023
Accepted:
8
May
2024
Published online:
20
May
2024
Molecular dynamics simulations are employed to study dislocation movement and wear response of nanocrystalline nickel (Ni). To explore the coefficient of friction values within the range near the Hall–Patch breakdown, samples were prepared with grain sizes ranging from 3.5 to 9.2 nm. Through the simulating a nanoscratching process using a spherical indenter, the concurrent influence of indenter dimensions and grain sizes on the friction coefficient of nanocrystalline Ni is examined. The results indicated that increasing the grain size and indenter dimension in nanocrystalline Ni led to a decrease in the coefficient of friction. Notably, the dimensions of the indenter had a more significant impact on the observed effects compared to the grain size. Also, it is observed that significant dislocation growth occurred during the scratching process when the indenter dimensions are large.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
