Abstract
Tribological processes cause large plastic strains and plastic strain gradients adjacent to the interface between the interacting materials. For sliding wear and erosion test specimens, the dislocation structures observed in the plastically deformed material are consistent with those expected when energy is minimized. Studies of these structures can contribute to our knowledge of deformation and dislocation substructures produced at large strains under other test conditions. Tribological processes also create patches or layers of mechanically mixed material on one or both of the contacting surfaces. This material is important in the generation of typical wear debris. Studies of the mechanically mixed material may also be helpful in understanding the structure and properties of ultrafine grained two-phase materials.
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