X-ray Analysis of Cu Subjected to SPD

Igor V. Alexandrov 1Ascar R. Kilmametov 1Rafael M. Mazitov 2

1. Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, K.Marks St.12, Ufa 450000, Russian Federation
2. Institute of Molecules and Crystal Physics, Ufa Scientific Centre of Russian Academy of Sciences, 151 Prospekt Oktyabrya, Ufa 450075, Russian Federation

Abstract

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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Presentation: poster at E-MRS Fall Meeting 2003, Symposium G, by Rafail M. Mazitov
See On-line Journal of E-MRS Fall Meeting 2003

Submitted: 2003-05-27 14:09
Revised:   2009-06-08 12:55