Abstract
The behavior of coplanar slip in fcc metals has been examined in Cu-8 at%Al single crystals. Specimens used were rectangular plates so that the Burgers vectors of primary and coplanar slip were systematically controlled against the specimen surfaces. The results obtained are summarized as follows: (1) Since the latent hardening of secondary slip systems strongly occurs in the alloys, coplanar slip plays an important role for the relaxation of additional stress caused by the grip effect because of a weak interaction with the primary dislocations. (2) Activation of coplanar slip is determined by the ratio of Schmid’s factor of coplanar slip to that of primary slip rather than Schmid’s factor of coplanar slip itself. (3) When the tensile axis is close to the [\bar111]-[011] zone, coplanar slip is easily activated compared with other secondary slip. (4) Coplanar slip in stage II is observed to appear in the vicinity of the well-developed primary slip bands by electron microscopy. Coplanar slip in this stage of deformation contributes to the relaxation of the internal stress caused by primary slip.
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