Abstract
The orientation dependence of the “unloading yield effect” in copper single crystals was investigated. The maximum relative increase in flow stress due to unloading was observed to be orientation independent. An orientation dependence of the variation of the unloading yield with prestrain was observed. The role of secondary slip systems in establishing the unloading yield effect was investigated utilizing combined tensile-torsion deformation. A mechanism for the establishment of the unloading yield effect based on a forest dislocation interaction is proposed.
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