J. Man et al., Surface relief and its relation to the crystallographic orientation in fatigued copper single crystals, KOVOVE MAT, 38(5), 2000, pp. 339-353
Surface relief of cylindrical copper single crystals oriented for single sl
ip and cyclically strained in plastic strain control up to fracture was stu
died using Philips 505 scanning electron microscope and interference light
microscope. Both individual persistent slip bands (PSBs) and persistent sli
p macrobands (PSMs) were observed. Their length, width and height were dete
rmined in dependence on the position on the specimen surface. The PSMs heig
ht was found to depend strongly on the orientation of a surface normal with
respect to the primary slip direction. Protrusions grow exclusively in the
direction of the Burgers vector of the primary dislocations without appare
nt influence of the secondary slip. The height of PSMs is proportional to t
heir width and increases with their length measured in the active slip dire
ction and with cumulative plastic strain amplitude in PSBs.