Abstract
Polycrystalline nickel was cyclically deformed under stress control. Experiments with different maximum and mean stresses were performed, always applying the maximum stress in the first quarter cycle. During the tests the cyclic mechanical behaviour was studied and the occurrence of strain localization was investigated by surface relief observation and by transmission electron microscopy of bulk foils. The cyclic stress-strain response was shown to be affected characteristically by the mean and maximum stresses. On the surface, persistent slip markings were found not only for zero mean stress but also for wide range of non-vanishing mean stresses. Persistent slip bands with the typical ladder-like dislocation structure appeared in the bulk material only at symmetrical or nearly symmetrical cycling.
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