Abstract
A nanocrystalline Al-Mg-Si alloy model was established to reveal the temperature effect in nanotribology using atomistic simulations. Compared to room temperature, the samples at cryogenic temperature (CT) exhibited an increase in both the coefficient of friction (COF) and wear resistance. At CT, the thermal activation of interface atoms reduced, thereby inhibiting surface grain rotation and sliding within the atomistic model. There was grain coarsening (suppressed at CT) instead of grain refinement typically observed for surface grains. The results also indicated that changes in load influenced the COF response, with higher loads resulting in higher COF values. The friction laws in simulation and experiment are similar.
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