Effect of current density on electrochemical cold drawing of single crystal copper bar
The effects of different current densities on the drawing force,hardness,crystal orientation and dislocation during electrochemi-cal cold drawing process of single crystal copper bars were studied through analysis methods such as micro Vickers hardness tester,electron backscatter diffraction and transmission electron microscopy.The results show that when the current density is 6.7 mA·cm-2,the number of activated slip systems is the most,the drawing force is the smallest,and the surface hardness after drawing is also the smallest.Differ-ent current densities result in different degrees of plasticization of single crystal copper bars,mainly due to the different number of activa-ted slip systems within the crystal,which results in dislocations easy to move and reduces dislocation entanglement.With higher current densities,as the thickness of the surface corrosion layer increases and the number of activated slip systems decreases,the friction force in-creases and the dislocation density increases,resulting in further increase of drawing force.
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