Dislocation microstructures and surface morphology in fatigued fine-grained copper polycrystals

Transmission electron microscopy observations of the dislocation substructure in fine-grained copper polycrystals fatigued at room temperature were carried out to investigate the correlation between surface morphology and the underlying dislocation substructure. The results indicate that samples fatigued under constant plastic strain amplitude well into the saturation region develop a small-scale surface roughness. The volume fraction of …