Texture evolution of Mg during high-pressure torsion
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Polycrystalline magnesium of 99.8 wt.% purity was subjected to high-pressure torsion (HPT) at room temperature. A special technique was developed in order to enable HPT of Mg up to very high shear strains of 115 and hydrostatic pressures of 4 GPa. The texture development during HPT was investigated by systematic X-ray texture measurements. It can be described by a stationary oblique B fibre characteristic of hexagonal metals subjected to simple shear. From the measured shear strain and pressure dependences of the B fibre and from microstructure investigations by TEM, it is concluded that also mechanisms of both dynamic and of static recrystallization contribute to the texture evolution.
KeywordsHydrostatic Pressure Shear Strain Texture Evolution Transmission Electron Microscopy Investigation Maximum Shear Strain
The authors are grateful for financial support from the Focus Project “Bulk Nanostructured Materials” of University of Vienna, and from the PhD Program “I022-N Experimental Materials Science-Nanostructured Materials” of University of Vienna. They kindly acknowledge support by Grant No. 220.127.116.11 provided by the Polish Ministry of Science and Higher Education. Parts of this work have been achieved within an Ernst Mach scholarship of the Austrian Exchange Services OEAD, and within a scholarship of the Central European Exchange Programme for University Studies (CEEPUS). The authors gratefully acknowledge the financial support of the Austrian Science Fund Project Nr. 17095N02.
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