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On the dispersion strengthening mechanisms in ODS materials

  • Bernd Reppich EMAIL logo
Veröffentlicht/Copyright: 3. Januar 2022
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 93 Heft 7

Abstract

The interaction of dislocations with finely-dispersed incoherent, non-shearable, hard particles governing the strength of oxide dispersion-strengthened (ODS) materials is briefly reviewed with particular emphasis on the basic features of the operating high-temperature mechanisms. The experimental determination of the particle-threshold stress within the yield stress- increment approach as well as its modelling in terms of the “interfacial pinning” mechanism are outlined and exemplified with the austenitic ODS superalloy MA 754 and its ferritic counterparts MA 956 and PM 2000. The available data of very recent high-voltage electron microscopic observations on MA 754 and MA 956 are re-evaluated. In situ straining experiments image moving dislocations under full stress and yield valuable quantitative informations characterizing the controlling (attractive) dislocation – dispersoid particle interaction which are not directly accessible by other methods, such as the (effective) obstacle density; the specific obstacle (particle) strength derived from the relevant interaction parameters; the locally acting shear stress estimated using the measured particle spacings, the curvature of the bowed-out dislocation segments in the stress-applied state, and their line tension calculated within the de Wit-Koehler model. The findings obtained in combination with the results of earlier conventional electron microscopy and those of critically analyzed macroscopic deformation data support convincingly our understanding of the elementary physical mechanisms underlying elevated temperature dispersion strengthening which promises, eventually, to put microstructural-based model description of the yield/creep strength on a more quantitative footing.

Keywords: ODS superalloys; High-temperature yielding; Threshold-stress concept; HVTEM in situ straining; Dislocation– particle interaction

Dedicated to Professor Dr. Haël Mughrabi on the occasion of his 65th birthday

The author is very grateful to Dr. M. Bartsch (Max-Planck-Institut für Mikrostrukturphysik, Halle, Germany) for calculating the line energy factors of PM 2000 and to Dr. A. Wasilkowska (University of Mining and Metallurgy, Cracow, Poland) for making the MA 956 alloy specimens available. The excellent support of Mr. B. Kummer in the performing of the yield stress measurements and of Mrs.W. Kränzlein, Mrs. R. Graham and Dr. H. W. Höppel in the preparation of the manuscript is acknowledged sincerely.

Prof. Dr. B. Reppich Institut für Werkstoffwissenschaften Lehrstuhl I (Allgemeine Werkstoffeigenschaften) Martensstr. 5, D-91058 Erlangen, Germany Tel.: +49 9131 85 27503 Fax: +49 9131 85 27504

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Received: 2002-02-20
Published Online: 2022-01-03

© 2002 Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles/Aufsätze
  5. A model for the work hardening of WC–Co “hard metals”
  6. On the dispersion strengthening mechanisms in ODS materials
  7. Effect of hydrogen on the mechanical properties of the β titanium alloy Timetal® 21S
  8. Cyclic deformation behaviour of (α + β) titanium alloys under complex mechanical and physiological loading conditions
  9. Assessment of the influence of interdendritic shrinkage cavities on the thermo-mechanical fatigue behaviour of the nickel-base superalloy MAR-M247LC
  10. Effects of static strain aging on residual stress stability and alternating bending strength of shot peened AISI 4140
  11. On the possibilities to enhance the fatigue properties of ultrafine-grained metals
  12. New method of determining stress relaxation behavior in creep machines by controlled unloading
  13. Creep of binary Ni-rich NiTi shape memory alloys and the influence of pre-creep on martensitic transformations
  14. Interaction of high-cycle fatigue with high-temperature creep in superalloy single crystals
  15. A unified description of creep in pure and dispersion-strengthened copper
  16. A new interpretation of flow-stress measurements of high-purity NiAl below room temperature
  17. A mesoscopic plasticity model accounting for spatial fluctuations of plastic strains, internal stresses and dislocation densities
  18. Behavior of X-ray peak widths in the Wilkens model of a restrictedly random distribution of dislocations
  19. Dislocation structure and crystallite size distribution in hexagonal nanomaterials from X-ray peak profile analysis
  20. Werden gewichtsoptimiert konstruierte Bauteile durch die Verwendung von Leichtmetallen wirklich leichter?*)
  21. Strain-induced martensite formation in metastable austenitic steels with varying carbon content
  22. Isothermal bainitic transformation in low alloy steels: factors limiting prediction of the resulting material’s properties
  23. Fatigue damage evolution in a particulate-reinforced metal matrix composite determined by acoustic emission and compliance method
  24. Microstructure and modification mechanisms of Si phase in as-thixoformed alloy A356
  25. Influence of size effect on microstructural changes in cyclically deformed polycrystalline nickel
  26. Self-diffusion of 71Ge and 31Si in Si –Ge alloys
  27. On localised corrosive attack, stress corrosion cracking and corrosion fatigue effects in a hardmetal cutting-tool material
  28. The internal stress during growth of SiC single crystals
  29. Notifications/Mitteilungen
  30. Personal/Personelles
  31. Books/Bücher
  32. DGM Conferences/Training
https://doi.org/10.3139/ijmr-2002-0104
Schlagwörter für diesen Artikel
ODS superalloys; High-temperature yielding; Threshold-stress concept; HVTEM in situ straining; Dislocation– particle interaction

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles/Aufsätze
  5. A model for the work hardening of WC–Co “hard metals”
  6. On the dispersion strengthening mechanisms in ODS materials
  7. Effect of hydrogen on the mechanical properties of the β titanium alloy Timetal® 21S
  8. Cyclic deformation behaviour of (α + β) titanium alloys under complex mechanical and physiological loading conditions
  9. Assessment of the influence of interdendritic shrinkage cavities on the thermo-mechanical fatigue behaviour of the nickel-base superalloy MAR-M247LC
  10. Effects of static strain aging on residual stress stability and alternating bending strength of shot peened AISI 4140
  11. On the possibilities to enhance the fatigue properties of ultrafine-grained metals
  12. New method of determining stress relaxation behavior in creep machines by controlled unloading
  13. Creep of binary Ni-rich NiTi shape memory alloys and the influence of pre-creep on martensitic transformations
  14. Interaction of high-cycle fatigue with high-temperature creep in superalloy single crystals
  15. A unified description of creep in pure and dispersion-strengthened copper
  16. A new interpretation of flow-stress measurements of high-purity NiAl below room temperature
  17. A mesoscopic plasticity model accounting for spatial fluctuations of plastic strains, internal stresses and dislocation densities
  18. Behavior of X-ray peak widths in the Wilkens model of a restrictedly random distribution of dislocations
  19. Dislocation structure and crystallite size distribution in hexagonal nanomaterials from X-ray peak profile analysis
  20. Werden gewichtsoptimiert konstruierte Bauteile durch die Verwendung von Leichtmetallen wirklich leichter?*)
  21. Strain-induced martensite formation in metastable austenitic steels with varying carbon content
  22. Isothermal bainitic transformation in low alloy steels: factors limiting prediction of the resulting material’s properties
  23. Fatigue damage evolution in a particulate-reinforced metal matrix composite determined by acoustic emission and compliance method
  24. Microstructure and modification mechanisms of Si phase in as-thixoformed alloy A356
  25. Influence of size effect on microstructural changes in cyclically deformed polycrystalline nickel
  26. Self-diffusion of 71Ge and 31Si in Si –Ge alloys
  27. On localised corrosive attack, stress corrosion cracking and corrosion fatigue effects in a hardmetal cutting-tool material
  28. The internal stress during growth of SiC single crystals
  29. Notifications/Mitteilungen
  30. Personal/Personelles
  31. Books/Bücher
  32. DGM Conferences/Training
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