Study of Initial Stages of Wear by Electron Channeling. I. Measurement of Plastic Strain in Copper Due to Sliding Wear. II. Quantitative Methods in Wear Debris Analysis.

摘要

Wear experiments have been conducted to determine the plastic strains that are introduced in the surface material near sliding wear tracks. Both oil lubricated and dry sliding experiments have been carried out at different sliding distances on surfaces of copper. The strain values were determined from selected area electron channeling patterns obtained using a scanning electron microscope from regions as small as 10 micrometers in size and 0.05 micrometer deep around the wear track. A deformed calibration specimen was used to relate electron channeling band contrast to deformation strain. Wear debris has been removed from a number of test systems and analyzed using different methods. Those methods produced specific information concerning the particulate size and composition. A magnetic debris recovery method was quantitatively evaluated using actual debris samples and also using collections of manufactured particulates having known sizes and compositions. A comparison between chemical analysis and particulate analysis findings is presented.