Concentration Change of Sn in the Surface Layer of Cu-Sn Alloy System due to Friction

Changes in the composition and structure of Cu-5 wt%Sn alloy due to friction or heating were examined by means of Auger electron spectroscopy. It was found that the intensities of Auger spectra of Sn in the surface layer increased rapidly by friction or heating in vacuum, and that after heating at 300°C for 30 min, their maximum was about 40% of that from pure Sn. Similar change was observed on the surface abraded in the atmosphere, resulting in the formation of a Sn-rich layer just below the surface.