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Thermodynamic stabilization of nanocrystallinity

  • C. E. Krill III EMAIL logo , H. Ehrhardt und R. Birringer
Veröffentlicht/Copyright: 3. Februar 2022
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 96 Heft 10

Abstract

Nanocrystalline materials are polycrystals made up of nanometer-sized grains separated by a network of interfaces – grain or phase boundaries – that generally make a positive contribution to the total energy of the system. Consequently, there exists a thermodynamic driving force for reducing the overall interface area, which renders such systems intrinsically unstable against coarsening. The latter process entails interface migration and the concomitant deterioration of any property enhancements effected by the ultrafine grain size. We describe a strategy for significantly reducing or even eliminating the driving force for grain growth in nanocrystalline materials via the deliberate segregation of solute atoms into the core region of boundaries. Applied to Pd – Zr solid solutions containing up to 20 at.% Zr, the strategy yields nanocrystalline specimens manifesting an unusually high thermal stability with respect to grain growth, extending to the vicinity of the melting point. Parallels are drawn between the migration of grain boundaries in segregation-stabilized systems and antiphase domain boundaries in ordered alloys.

Keywords: Grain boundary energy; Nanocrystalline materials; Grain growth; Thermal stability
Prof. C. E. Krill III, Ph.D. Materials Division, University of Ulm Albert-Einstein-Allee 47, D-89081 Ulm, Germany Tel.: +49 731 502-5476 Fax: +49 731 502-5488

Robert Bosch GmbH, CR/APJ3, Postfach 30 02 40, D-70442 Stuttgart

Dedicated to Professor Dr. Lasar Shvindlerman on the occasion of his 70th birthday

  1. We are most grateful to J. Weissmüller for numerous fruitful discussions and to the Deutsche Forschungsgemeinschaft for financial support of this research through SFB 277 and a Habilitation fellowship (CEK).

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Received: 2005-06-26
Accepted: 2005-07-16
Published Online: 2022-02-03

© 2005 Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles Basic
  5. Thermodynamics of grain boundary adsorption in binary systems with limited solubility
  6. Microstructural characteristics of 3-d networks
  7. On the three-dimensional twin-limited microstructure
  8. Grain growth kinetics in 2D polycrystals: impact of triple junctions
  9. Thermal stability of polycrystalline nanowires
  10. Conservative motion of parent-martensite interfaces
  11. Enthalpy – entropy compensation effect in grain boundary phenomena
  12. Thermodynamic stabilization of nanocrystallinity
  13. On the relation between the anisotropies of grain boundary segregation and grain boundary energy
  14. Influence of faceting-roughening on triple-junction migration in zinc
  15. The influence of triple junction kinetics on the evolution of polycrystalline materials during normal grain growth: New evidence from in-situ experiments using columnar Al foil
  16. Grain boundary dynamics and selective grain growth in non-ferromagnetic metals in high magnetic fields
  17. Grain boundary mobility under a stored-energy driving force: a comparison to curvature-driven boundary migration
  18. Diffusional behavior of nanoscale lead inclusions in crystalline aluminum
  19. Quantitative experiments on the transition between linear to non-linear segregation of Ag in Cu bicrystals studied by radiotracer grain boundary diffusion
  20. Room-temperature grain boundary diffusion data measured from historical artifacts
  21. Solid state infiltration of porous steel with aluminium by the forcefill process
  22. A mechanism of plane matching boundary-assisted α/γ phase transformation in Fe–Cr alloy based on in-situ observations
  23. Fast penetration of Ga in Al: liquid metal embrittlement near the threshold of grain boundary wetting
  24. High-pressure effect on grain boundary wetting in aluminium bicrystals
  25. Grain boundary segregation and fracture
  26. Notifications/Mitteilungen
  27. Personal/Personelles
  28. Press/Presse
  29. Conferences/Konferenzen
https://doi.org/10.1515/ijmr-2005-0196
Schlagwörter für diesen Artikel
Grain boundary energy; Nanocrystalline materials; Grain growth; Thermal stability

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Editorial
  4. Articles Basic
  5. Thermodynamics of grain boundary adsorption in binary systems with limited solubility
  6. Microstructural characteristics of 3-d networks
  7. On the three-dimensional twin-limited microstructure
  8. Grain growth kinetics in 2D polycrystals: impact of triple junctions
  9. Thermal stability of polycrystalline nanowires
  10. Conservative motion of parent-martensite interfaces
  11. Enthalpy – entropy compensation effect in grain boundary phenomena
  12. Thermodynamic stabilization of nanocrystallinity
  13. On the relation between the anisotropies of grain boundary segregation and grain boundary energy
  14. Influence of faceting-roughening on triple-junction migration in zinc
  15. The influence of triple junction kinetics on the evolution of polycrystalline materials during normal grain growth: New evidence from in-situ experiments using columnar Al foil
  16. Grain boundary dynamics and selective grain growth in non-ferromagnetic metals in high magnetic fields
  17. Grain boundary mobility under a stored-energy driving force: a comparison to curvature-driven boundary migration
  18. Diffusional behavior of nanoscale lead inclusions in crystalline aluminum
  19. Quantitative experiments on the transition between linear to non-linear segregation of Ag in Cu bicrystals studied by radiotracer grain boundary diffusion
  20. Room-temperature grain boundary diffusion data measured from historical artifacts
  21. Solid state infiltration of porous steel with aluminium by the forcefill process
  22. A mechanism of plane matching boundary-assisted α/γ phase transformation in Fe–Cr alloy based on in-situ observations
  23. Fast penetration of Ga in Al: liquid metal embrittlement near the threshold of grain boundary wetting
  24. High-pressure effect on grain boundary wetting in aluminium bicrystals
  25. Grain boundary segregation and fracture
  26. Notifications/Mitteilungen
  27. Personal/Personelles
  28. Press/Presse
  29. Conferences/Konferenzen
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