Recent investigations revealed that bulk nanostructured materials exhibit very attractive properties caused by their specific structure. So, it is very important to conduct thorough study of its peculiarities.
In the present research the bulk nanostructured Cu samples were investigated by the X-ray diffraction technique in the temperature interval from 85 K to 295 K. The samples were prepared by the severe plastic deformation (SPD) method performed by the high pressure torsion technique.
The obtained X-ray data were analyzed in framework of the Debye quasiharmonic approximation. A decrease in the Debye temperature up to 19 - 23 % and an increase in static and dynamic atomic displacements up to 45% and 48% correspondently were revealed. The linear heat expansion coefficient increased more than 3 times in comparison with the initial well annealed state. The shift of the phonon maximum spectrum to a long-wave part was discovered.
The obtained experimental data are discussed in framework of the two-phase structural model composed of the perfect bulk lattice phase and nonequilibrium grain boundary phase.

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1. A change in dislocation density during equal-channel angular pressing of Cu: experiment and simulation.
2. Analysis of homogeneity of texture formation processes under high pressure torsion
3. Analysis of Deformation Behavior of Cu Processed by High Pressure Torsion
4. X-RAY ANALYSIS OF HIGH PRESSURE TORSION INDUCED NANOSTRUCTURES IN TI AND NI
5. A physical criterion for the grain subdivision during severe plastic deformation
6. Experimental studies and modeling of SPD materials
7. Nanostructure Formation in Copper Subjected to High Pressure Torsion