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Metal Science and Heat Treatment

, Volume 54, Issue 5–6, pp 234–238 | Cite as

Low-temperature internal friction and nanostructured metal stability

  • P. P. Pal’-Val’
  • L. N. Pal’-Val’
Nanocrystalline Materials, High Damping Alloys, Structural and Phase Transformations

The effect of aging at room temperature after equal-channel angular pressing and annealing on parameters of the low-temperature relaxation peak and dynamic Young’s modulus in nanostructured copper is studied. The dislocation nature of the peak is established. It is shown that the high rate of change for all peak parameters is observed close to the copper static relaxation temperature. The data obtained are in good agreement with results of high-temperature in situ changes of elasticity modulus and microhardness.

Key words

nanostructured materials low temperatures acoustic properties dislocations annealing 

References

  1. 1.
    R. Z. Valiev and T. G. Langdon, “Principles of equal-channel angular pressing as a processing tool for grain refinement,” Prog. Mater. Sci., 51, 881–891 (2006).CrossRefGoogle Scholar
  2. 2.
    N. Kobelev, E. Kolyvanov, and Y. Estrin, “Temperature dependence of sound attenuation and shear modulus of ultra fine grained copper produced by equal channel angular pressing,” Acta Mater., 56, 1473–1481 (2008).CrossRefGoogle Scholar
  3. 3.
    V. D. Natsik, P. P. Pal’-Val’, and S. N. Smirnov, “Composite piezoelectric vibrator theory,” Akust. Zh., 44(5), 640–647 (1998).Google Scholar
  4. 4.
    I. I. Novikov, Metal Heat Treatment Theory [in Russian], Metallurgiya, Moscow (1986).Google Scholar
  5. 5.
    D. Niblett and J. Wickes, “Internal friction in metals connected with dislocations,” Usp. Fiz. Nauk, 80(1), 125–187 (1963).Google Scholar
  6. 6.
    A. Zeger and P. Shiller, “Kinks at dislocations and their effect on internal friction in crystals,” in: U. Mason (ed.), Physical Acoustics [Russian translation], Mir, Moscow (1969), Vol. 3, Part A, pp. 428–573.Google Scholar
  7. 7.
    A. Novik and B. Berry, Relaxation Phenomena in Crystals [in Russian], Atomizdat, Moscow (1975).Google Scholar
  8. 8.
    V. S. Postnikov, Internal Friction in Metals [in Russian], Metallurgiya, Moscow (1974).Google Scholar
  9. 9.
    I. S. Golovin, “Grain-boundary relaxation in copper before and after equal channel angular pressing and recrystallization,” Fiz. Met. Metalloved., 110(4), 424–432 (2010).Google Scholar
  10. 10.
    I. S. Golovin and Y. Estrin, “Mechanical spectroscopy of ultra-fine grained copper,” Mat. Sci. Forum., 667–669, 857–862 (2011).Google Scholar
  11. 11.
    R. J. Hellmig, M. Janecek, B. Hadzima, et al., “ A portrait of copper processed by equal channel angular pressing,” Mater. Trans., 49(1), 31–37 (2008).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2012

Authors and Affiliations

  1. 1.B. I. Verkin Physicotechical Institute of Low TemperaturesUkrainian National Academy of SciencesKharkovUkraine

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