Extrusion and intrusion in plastically deformed copper foils

T. R. Zetova Department of Physics, Department of Solid State Physics, Kharkov National University, 4 Svoboda Sq., 61022 Kharkov, Ukraine
E. E. Badiyan Department of Physics, Department of Solid State Physics, Kharkov National University, 4 Svoboda Sq., 61022 Kharkov, Ukraine

Keywords: color orientation maps, extrusion, intrusion, the copper sample, twin boundary

Abstract

It was found experimentally that during the deformation of copper foil of thickness 200 microns, having only the through twin boundaries, which occur in extrusion and intrusion. Place of localization - twins boundary. This method of relaxation state of stress usually occurs when fatigue (cyclic) test specimens, which may cross slip of dislocations. Place localization of extrusions and intrusions - the region of stable slip bands (UPS). Thus, the formation of extrusions and intrusions during static deformation is not typical for copper samples in which because of the low stacking fault energy can not cross slip. It is shown that a possible cause of extrusions and intrusions in the copper foil is a specific orientation of the samples, their thickness (200 microns) and the presence of through twin boundaries through.

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References

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