U. Holzwarth et U. Essmann, THE IRREVERSIBILITY OF DISLOCATION-WALL FORMATION IN PERSISTENT SLIP BANDS, Philosophical magazine letters, 70(2), 1994, pp. 75-80
By cyclic deformation of copper single crystals with an amplitude of r
esolved plastic shear strain gamma(pl) almost-equal-to gamma(M) almost
-equal-to 1.2 x 10(-4) at 300 K, a saturated hard matrix structure was
established. Then a certain volume fraction of the matrix was transfo
rmed into persistent slip bands (PSBs) by increasing gamma(pl). After
this step the cyclic deformation was continued with an amplitude gamma
(pl) less-than-or-equal-to gamma(M) up to cumulative plastic strains o
f more than 40 in order to test whether it is possible to retransform
the characteristic ladder-like dislocation arrangement of PSBs into a
matrix-like structure. Transmission electron microscopy revealed that
such a retransformation did not occur.