Dry sliding wear behavior of nanocrystalline Fe88Si12 alloy has been investigated compared with coarse grained counterpart. The friction coefficient of the Fe88Si12 alloy changes slightly with grain size. But the wear resistance of the Fe88Si12 alloy improves as the grain size decreases to 40 nm, and then weakens when the grain size decreases from 40 nm to 10 nm. The grain size has significantly effect on the tribological behavior of Fe88Si12 alloy by modifying the hardness and the tribo-chemical interaction on the sliding zone during the wear process.
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