Burnishing

Burnishing is the plastic deformation of a surface due to sliding contact with another object. It smooths the surface and makes it shinier. Burnishing may occur on any sliding surface if the contact stress locally exceeds the yield strength of the material.

The phenomenon can occur both unintentionally as a failure mode, and intentionally as part of a metalworking or manufacturing process.
It is a squeezing operation under cold working.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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