期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2008.11.023
关键词
Severe plastic deformation; High-pressure torsion; Ultrafine-grained copper; X-ray diffraction; Synchrotron light
Microstructure evolution in severely deformed Cu has been investigated using high-energy synchrotron light during in situ high-pressure torsion (HPT) at room temperature. Relative changes in broadening of Bragg peaks and crystal lattice expansion were studied in the loading-unloading regime of torsion straining. Experimental results revealed fast relaxation (on the order of hundred of seconds) that occurred due to annihilation of HPT-induced crystal lattice defects, which were generated directly during deformation. The kinetics of relaxation is probably diffusion-controlled; therefore, the enhanced diffusivity can be explained by extremely high excess vacancy concentration, which is usually achieved at thermal equilibrium near the melting point. (C) 2008 Elsevier B.V. All rights reserved.
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