Article ID Journal Published Year Pages File Type
786425 International Journal of Plasticity 2015 18 Pages PDF
Abstract

•We study deformation relief on the surface of monocrystals under compression.•Macrofragmentation sequence has been determined.•We found interrelation between segmentation and stages of the stress-strain curve.•Sample is divided into 5 segments.•Shear by initially unloaded plane (1¯11) has been observed.

The surface deformation-induced pattern (relief) of copper single crystals with the orientation of the compression axis along [11¯1¯] has been investigated by means of optical, scanning electron and atomic force microscopy. The misorientations between both macroscopic and mesoscopic areas in [11¯1¯]-single crystals have been determined using the electron back scattering diffraction (EBSD) technique. The macroscopic reorientation has been revealed to rotate the crystalline lattice around the [110] axis. The single crystal has been divided into five macrosegments with their misorientations distributed along the compression axis in a manner that the deformation axis sequentially coincided with the crystallographic directions in the order [11¯1¯]-[22¯1¯]-[77¯3¯]-[11¯0]. Shear by unloaded plane (11¯1¯) has been observed. The macrolevel deformation up to 25% has been developing as follows: shear by octahedral planes – development of macrobands – reorientation of the central zones – shear by unloaded octahedral plane in the reoriented zones. The steps of this sequence corresponded to the stages of the stress-strain curves.

Related Topics
Physical Sciences and Engineering Engineering Mechanical Engineering
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