Abstract
Investigation of the positron lifetime depth profile in pure iron, copper, stainless steel and silver alloy subjected to a dry sliding test have been performed. Near the worn surface, at the depth less than 10 μm the so called tribolayer is visible. Its characteristic feature is the presence of the large vacancy clusters but only in the pure studied metals. A deeper, deeply plastically deformed zone is observed, where positron lifetime values remain almost constant. Beyond, the third zone is found which is characterized by the almost exponential decays of the positron lifetime value up to the bulk value. The total depth of the subsurface zone depends on the material and significantly exceeds 200 μm.
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