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Vacancy concentrations determined from the diffuse background scattering of X-rays in plastically deformed copper

  • T. Ungár EMAIL logo , E. Schafler , P. Hanák , S. Bernstorff and M. Zehetbauer
Published/Copyright: January 28, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 96 Issue 6

Abstract

The background intensity of X-ray diffraction patterns is analysed in terms of point defects, especially vacancies, in poly- and single-crystalline copper specimens. The samples have been deformed by compression in-situ in a synchrotron peak profile experiment. Systematic comparative analysis of X-ray, electrical resistivity, and calorimetric measurements indicate that (i) point defects, especially vacancies, are produced during plastic deformation and (ii) that the point defect concentration is increasing concomittantly with the actual dislocation density. The point defect production rate in poly- and single-crystalline specimens is observed to be drastically different. This difference is interpreted as different vacancy production rates in the grain interior and in the grain-boundary regions. With increasing deformation, the vacancy concentration in the grain-boundary regions is found to approach the equilibrium values corresponding to the melting temperature of copper. This result would support the assumption that in severely deformed metals the grain boundary region is a highly distorted, almost amorphous phase of the material.

Keywords: Vacancy concentration; Dislocations; X-ray line-profile analysis; in-situ compression
Prof. Tamas Ungár Department of Physics Eütvüs University Budapest, H-1518 POB, Hungary Tel.: +36 1372 2801 Fax: +36 1372 2811

Dedicated to Professor Wolfgang Blum on the occasion of his 65th birthday

  1. T.U is grateful to the Hungarian National Science Foundation, OTKA T46990 and OTKAT43247, for supporting this work.

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Received: 2005-12-23
Accepted: 2005-03-15
Published Online: 2022-01-28

© 2005 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles Basic
  5. Identifying creep mechanisms in plastic flow
  6. A unified microstructural metal plasticity model applied in testing, processing, and forming of aluminium alloys
  7. Implications of non-negligible microstructural variations during steady-state deformation
  8. Tertiary creep of metals and alloys
  9. Interactions between particles and low-angle dislocation boundaries during high-temperature deformation
  10. Strain-rate sensitivity of ultrafine-grained materials
  11. Transient plastic flow at nominally fixed structure due to load redistribution
  12. Vacancy concentrations determined from the diffuse background scattering of X-rays in plastically deformed copper
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  14. About stress reduction experiments during constant strain-rate deformation tests
  15. Finite-element modelling of anisotropic single-crystal superalloy creep deformation based on dislocation densities of individual slip systems
  16. Variational approach to subgrain formation
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  19. Creep properties at 125 °C of an AM50 Mg alloy modified by Si additions
  20. Dependence of mechanical strength on grain structure in the γ′ and oxide dispersions-trengthened nickelbase superalloy PM 3030
  21. On the improvement of the ductility of molybdenum by spinel (MgAl2O4) particles
  22. Hot workability and extrusion modelling of magnesium alloys
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  25. Influence of Lüders band formation on the cyclic creep behaviour of a low-carbon steel for piping applications
  26. Creep and creep rupture behaviour of 650 °C ferritic/martensitic super heat resistant steels
  27. Toughening mechanisms of a Ti-based nanostructured composite containing ductile dendrites
  28. Notifications/Mitteilungen
  29. Personal/Personelles
  30. News/Aktuelles
  31. Conferences/Konferenzen
https://doi.org/10.3139/ijmr-2005-0103
Keywords for this article
Vacancy concentration; Dislocations; X-ray line-profile analysis; in-situ compression

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles Basic
  5. Identifying creep mechanisms in plastic flow
  6. A unified microstructural metal plasticity model applied in testing, processing, and forming of aluminium alloys
  7. Implications of non-negligible microstructural variations during steady-state deformation
  8. Tertiary creep of metals and alloys
  9. Interactions between particles and low-angle dislocation boundaries during high-temperature deformation
  10. Strain-rate sensitivity of ultrafine-grained materials
  11. Transient plastic flow at nominally fixed structure due to load redistribution
  12. Vacancy concentrations determined from the diffuse background scattering of X-rays in plastically deformed copper
  13. Effect of heating rate in α + γ dual-phase field on lamellar microstructure and creep resistance of a TiAl alloy
  14. About stress reduction experiments during constant strain-rate deformation tests
  15. Finite-element modelling of anisotropic single-crystal superalloy creep deformation based on dislocation densities of individual slip systems
  16. Variational approach to subgrain formation
  17. Articles Applied
  18. Pseudoelastic cycling of ultra-fine-grained NiTi shape-memory wires
  19. Creep properties at 125 °C of an AM50 Mg alloy modified by Si additions
  20. Dependence of mechanical strength on grain structure in the γ′ and oxide dispersions-trengthened nickelbase superalloy PM 3030
  21. On the improvement of the ductility of molybdenum by spinel (MgAl2O4) particles
  22. Hot workability and extrusion modelling of magnesium alloys
  23. Characterization of hot-deformation behaviour of Zircaloy-2: a comparison between kinetic analysis and processing maps
  24. Requirements for microstructural investigations of steels used in modern power plants
  25. Influence of Lüders band formation on the cyclic creep behaviour of a low-carbon steel for piping applications
  26. Creep and creep rupture behaviour of 650 °C ferritic/martensitic super heat resistant steels
  27. Toughening mechanisms of a Ti-based nanostructured composite containing ductile dendrites
  28. Notifications/Mitteilungen
  29. Personal/Personelles
  30. News/Aktuelles
  31. Conferences/Konferenzen
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