Highlights:
By FIB-HRTEM, we have found that the sliding contact could immediately reorient the WS2 platelets parallel to the sliding interface, in contrary to that amorphous TMDs crystallize initially from the bottom of the wear track and become mostly ordered at the outmost tribofilm as extensively reported before, and thereby it leads to a self-adaptive “frictionless” response. The coefficient of friction falls to 0.02 in dry air and reaches 0.10 in humid air, and is reversible as testing atmosphere cycles between dry air and humid air. Ref: https://doi.org/10.1016/j.matlet.2018.06.111
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January 2020
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