| The distribution of mechanical properties in a billet of pure aluminum (99.99%) processed by equal-channel angular pressing has been studied using microhardness measurement and tensile testing. It has been found that the variation of microhardness, ultimate strength and elongation up to failure is insignificant for the all studied samples whereas the yield strength of the samples cut from the core of the billet exceeds the respective value obtained for the samples cut from the layers in the vicinity of the top and bottom surfaces by up to 30%. The latter demonstrate essential deformation hardening during plastic flow. In order to explain the difference in deformation behavior, the detailed structural study has been carried out by means of electron-backscattered diffraction analysis. |
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