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Dislocationless sliding in a polycluster glass

Dedicated to Prof. Dr.-Ing. Heinrich Wollenberger on the occasion of his 80th birthday
  • Nikolai Lazarev and Alexander Bakai
Published/Copyright: May 18, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 102 Issue 9

Abstract

At low temperature, T → 0, the yield stress of a perfect crystal is equal to its so called theoretical strength. The yield stress of imperfect crystals is controlled by the stress threshold of dislocation mobility. A non-crystalline solid has neither the ideal structure nor gliding dislocations. Its yield stress depends on the distribution of local critical stresses attributed to each atomic site at which the local inelastic deformation occurs. We describe the exactly solvable model of planar layer strength and sliding with an arbitrary homogeneous distribution of local critical stresses. The kinetics of thermally-activated creep of the sliding layer is described. The sliding activation volume scales with the applied external stress as ∼ωe-β, where β < 1.

The proposed model accounts for mechanisms of the low temperature deformation of polycluster metallic glasses, since intercluster boundaries of a polycluster metallic glass are natural sliding layers of the described type. We also discuss applicability of the model to the low temperature plastic deformation of nano-crystalline materials.

Keywords: Yield strength; Creep; Activation volume
∗ Correspondence address, Dr. Nikolai Lazarev, NSC Kharkov Institute of Physics and Technology, Institute for Theoretical Physics, Akademichna str. 1, 61108 Kharkov, Ukraine, Tel.: +38573 356203, Fax: +38573 352683, E-mail:

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Received: 2011-2-15
Accepted: 2011-7-18
Published Online: 2013-05-18
Published in Print: 2011-09-01

© 2011, Carl Hanser Verlag, München

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  5. Original Contributions
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  7. Accumulation of radiation damage and disordering in MgAl2O4 under swift heavy ion irradiation
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  13. Beyond Ni-based superalloys: Development of CoRe-based alloys for gas turbine applications at very high temperatures
  14. The effect of heat treatments on the microstructure, texture and mechanical properties of the extruded magnesium alloy ME21
  15. Analysing SANS data to determine magnetisation reversal processes in composite perpendicular magnetic recording media using TEM images
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  17. Evolution of transformation plasticity during bainitic transformation
  18. Surface tension and viscosity of NiAl catalytic precursor alloys from microgravity experiments
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  20. Fabrication of dielectric thin films by sputtering deposition at different pressures with (Ba0.3Sr0.7)(Zn1/3Nb2/3)O3 ceramic as target
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https://doi.org/10.3139/146.110569
Keywords for this article
Yield strength; Creep; Activation volume

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Prof. Dr.-Ing. Heinrich Wollenberger — 80 years
  5. Original Contributions
  6. Atom probe tomography: from physical metallurgy towards microelectronics
  7. Accumulation of radiation damage and disordering in MgAl2O4 under swift heavy ion irradiation
  8. TEM study of irradiation induced copper precipitation in boron alloyed EUROFER97 steel
  9. Order – disorder transformation in Ni – V alloys under electron irradiation
  10. Materials issues of the SINQ high-power spallation target
  11. The origin and development of the P{011}<111> orientation during recrystallization of particle-containing alloys
  12. Coarsening kinetics of Cu-rich precipitates in a concentrated multicomponent Fe–Cu based steel
  13. Beyond Ni-based superalloys: Development of CoRe-based alloys for gas turbine applications at very high temperatures
  14. The effect of heat treatments on the microstructure, texture and mechanical properties of the extruded magnesium alloy ME21
  15. Analysing SANS data to determine magnetisation reversal processes in composite perpendicular magnetic recording media using TEM images
  16. Dislocationless sliding in a polycluster glass
  17. Evolution of transformation plasticity during bainitic transformation
  18. Surface tension and viscosity of NiAl catalytic precursor alloys from microgravity experiments
  19. Synthesis of carbon nanotubes by fine Ni particles in Ni3Al foam
  20. Fabrication of dielectric thin films by sputtering deposition at different pressures with (Ba0.3Sr0.7)(Zn1/3Nb2/3)O3 ceramic as target
  21. DGM News
  22. DGM News
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