Copper cryogenic deformation

The effect of high pressure torsion cryogenic deformation on the structure of copper was studied by electron back-scattered diffraction analysis. The average grain size was brought down to 0.2 $\mu$m. The analysis of the developed texture and misorientation distribution have demonstrated that the plastic flow arose mainly from the usual $\{111\}\langle110\rangle$ slip whereas thecontribution of mechanical twinning was very limited. The grain structure evolution was shown to be mainly governed by the geometrical effect of the imposed strain.