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Interactions between particles and low-angle dislocation boundaries during high-temperature deformation

  • David Holec and Antonín Dlouhý EMAIL logo
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

Stability and motion of low-angle dislocation boundaries in an array of particles is investigated. The 2D model considers discrete dislocations and circular precipitates with and without coherency stress fields. Dislocation – dislocation interactions, superimposed with precipitate stress fields and an externally applied stress, drive glide and climb of the dislocations. Results show that, in the case of a simple external shear loading, a single-valued critical applied shear stress exists which separates stable and unstable low-angle boundary configurations. This critical stress can differ considerably from the Orowan stress. More complicated applied stress states result in less clearly defined transitions between stable and unstable boundary regimes. Dislocation – dislocation interactions that stabilize low-angle dislocation boundaries thus may influence the high-temperature strength of particle-strengthened alloys.

Keywords: Low-angle dislocation boundary; Particle strengthening; Dislocation motion; Orowan stress
Dr. Antonín Dlouhý Institute of Physics of Materials Academy of Sciences of the Czech Republic Žižkova 22, CZ-61662 Brno, Czech Republic Tel.: +42 532 290 412 Fax: +42 541 218 657

  1. Financial support received from the Grant Agency of the Czech Republic under the contract number GA CR 106/05/091B is acknowledged.

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Received: 2005-02-15
Accepted: 2005-03-22
Published Online: 2022-01-28

© 2005 Carl Hanser Verlag, München

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https://doi.org/10.3139/ijmr-2005-0100
Keywords for this article
Low-angle dislocation boundary; Particle strengthening; Dislocation motion; Orowan stress

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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