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Ordering processes and atomic defects in FeCo

  • Alfred Seeger
Published/Copyright: February 12, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 97 Issue 7

Abstract

The present knowledge on self-diffusion and lattice vacancies in near-stoichiometric body-centred cubic FeCo alloys is critically reviewed and related to the establishment of structural order in the alloy after quenching from elevated temperatures. The available data may be consistently explained in terms of the so-called six-jump cycle mechanism of Huntington, Elcock and McCormick, plus the additional concept of ‘pseudo-selfdiffusivity’. It is shown that this leads to an understanding of the observed combinations of high activation enthalpy and large pre-exponential factor in the Fe self-diffusivity on the one hand, and of a lower activation enthalpy and ‘normal’ pre-exponential factor in the Co self-diffusion on the other hand. For some vacancy properties numerical estimates are given. The potential of muon spin rotation measurements for filling existing gaps in our knowledge is emphasized.

A critical discussion of the “500 °C anomaly” shows that the explanations attempted in the literature are unsatisfactory. It is proposed that the tetragonality of the compounds FeCo3 and Fe3Co predicted by ab-initio calculations of Díaz-Ortiz et al. may lead to a metastable pattern of antiphase domains on a very small scale, the dissolution of which may cause the anomaly.

Keywords: FeCo; FeCo3; Fe3Co; Order –disorder; 550 °C anomaly; Self-diffusion; Pseudo-selfdiffusion; Six-jump diffusion cycles; Vacancies; Positron annihilation; Muon spin rotation

Dedicated to Professor Dr. Knut Urban on the occasion of his 65th birthday

Prof. Dr. A. Seeger Universität Stuttgart Institut für theoretische und angewandte Physik Pfaffenwaldring 57, D-70569 Stuttgart, Germany Tel.: +49 711 692348 Fax: +49 711 685 65271

Funding statement: The author wishes to thank Professor S. Takaki, Sendai, for help with the Japanese language papers referred to above as well as Professor M. Fähnle, Stuttgart, and Professor H. Mehrer, Obersteinenbach, for discussion and suggestions

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Received: 2006-05-22
Accepted: 2006-05-29
Published Online: 2022-02-12

© 2006 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Professor Dr. Knut Urban 65 Years
  4. Basic
  5. Ordering processes and atomic defects in FeCo
  6. Atomic resolution electron tomography: a dream?
  7. Electron tomography of microelectronic device interconnects
  8. Aberration correction in electron microscopy
  9. Off-axis electron holography: Materials analysis at atomic resolution
  10. Determination of phases of complex scattering amplitudes and two-particle structure factors by investigating diffractograms of thin amorphous foils
  11. Prospects of the multislice method for CBED pattern calculation
  12. Electron energy-loss spectrometry for metals:some thoughts beyond microanalysis
  13. Quantitative assessment of nanoparticle size distributions from HRTEM images
  14. Quantitative microstructural and spectroscopic investigation of inversion domain boundaries in sintered zinc oxide ceramics doped with iron oxide
  15. Structural domains in antiferromagnetic LaFeO3 thin films
  16. Short-range order of liquid Ti72.3Fe27.7 investigated by a combination of neutron scattering and X-ray diffraction
  17. Extended interfacial structure between two asymmetrical facets of a Σ = 9 grain boundary in copper
  18. Dislocation imaging in fcc colloidal single crystals
  19. Applied
  20. Omega phase transformation – morphologies and mechanisms
  21. Mixed (Sr1 − xCax)33Bi24Al48O141 fullerenoids: the defect structure analysed by (S)TEM techniques
  22. Wetting of aluminium-based complex metallic alloys
  23. Annealing-induced phase transitions in a Zr–Ti–Nb–Cu–Ni–Al bulk metallic glass matrix composite containing quasicrystalline precipitates
  24. Special planar defects in the structural complex metallic alloys of Al–Pd–Mn and Al–Ni–Rh
  25. On the formation of Si nanowires by molecular beam epitaxy
  26. Self-induced oscillations in Si and other semiconductors
  27. Growth, interface structure, and magnetic properties of Fe/GaAs and Fe3Si/GaAs hybrid systems
  28. An investigation of improved titanium/titanium nitride barriers for submicron aluminum-filled contacts by energy-filtered transmission electron microscopy
  29. Radiation damage during HRTEM studies in pure Al and Al alloys
  30. Cross-sectional high-resolution transmission electron microscopy at Mo/Si multilayer stacks
  31. Structural properties of the fiber –matrix interface in carbon-fiber/carbon-matrix composites and interfaces between carbon layers and planar substrates
  32. Microstructure and properties of surface-treated Timetal 834
  33. Notifications
  34. Personal
  35. Conferences
https://doi.org/10.1515/ijmr-2006-0140
Keywords for this article
FeCo; FeCo3; Fe3Co; Order –disorder; 550 °C anomaly; Self-diffusion; Pseudo-selfdiffusion; Six-jump diffusion cycles; Vacancies; Positron annihilation; Muon spin rotation

Articles in the same Issue

  1. Frontmatter
  2. Editorial
  3. Professor Dr. Knut Urban 65 Years
  4. Basic
  5. Ordering processes and atomic defects in FeCo
  6. Atomic resolution electron tomography: a dream?
  7. Electron tomography of microelectronic device interconnects
  8. Aberration correction in electron microscopy
  9. Off-axis electron holography: Materials analysis at atomic resolution
  10. Determination of phases of complex scattering amplitudes and two-particle structure factors by investigating diffractograms of thin amorphous foils
  11. Prospects of the multislice method for CBED pattern calculation
  12. Electron energy-loss spectrometry for metals:some thoughts beyond microanalysis
  13. Quantitative assessment of nanoparticle size distributions from HRTEM images
  14. Quantitative microstructural and spectroscopic investigation of inversion domain boundaries in sintered zinc oxide ceramics doped with iron oxide
  15. Structural domains in antiferromagnetic LaFeO3 thin films
  16. Short-range order of liquid Ti72.3Fe27.7 investigated by a combination of neutron scattering and X-ray diffraction
  17. Extended interfacial structure between two asymmetrical facets of a Σ = 9 grain boundary in copper
  18. Dislocation imaging in fcc colloidal single crystals
  19. Applied
  20. Omega phase transformation – morphologies and mechanisms
  21. Mixed (Sr1 − xCax)33Bi24Al48O141 fullerenoids: the defect structure analysed by (S)TEM techniques
  22. Wetting of aluminium-based complex metallic alloys
  23. Annealing-induced phase transitions in a Zr–Ti–Nb–Cu–Ni–Al bulk metallic glass matrix composite containing quasicrystalline precipitates
  24. Special planar defects in the structural complex metallic alloys of Al–Pd–Mn and Al–Ni–Rh
  25. On the formation of Si nanowires by molecular beam epitaxy
  26. Self-induced oscillations in Si and other semiconductors
  27. Growth, interface structure, and magnetic properties of Fe/GaAs and Fe3Si/GaAs hybrid systems
  28. An investigation of improved titanium/titanium nitride barriers for submicron aluminum-filled contacts by energy-filtered transmission electron microscopy
  29. Radiation damage during HRTEM studies in pure Al and Al alloys
  30. Cross-sectional high-resolution transmission electron microscopy at Mo/Si multilayer stacks
  31. Structural properties of the fiber –matrix interface in carbon-fiber/carbon-matrix composites and interfaces between carbon layers and planar substrates
  32. Microstructure and properties of surface-treated Timetal 834
  33. Notifications
  34. Personal
  35. Conferences
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