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compound serves as a load-bearing element in the tribolayer while ZnO, due to its open wurtzite structure, promotes self-lubrication [41]. Therefore, as long as an oxide-rich tribolayer covers...]. Moreover, the self-annealing-induced softening might also happen in ZA22 alloy a few days after MDF process [35]. The Si addition and formation of hard Si crystals in the microstructure increase......