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Homogeneity of mechanically alloyed nano-crystalline Fe – Cu-powders

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Published/Copyright: May 23, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 99 Issue 5

Abstract

In this contribution Atom Probe Tomography has been applied systematically to characterise the homogeneity of mechanically alloyed Fe – Cu powders for two different compositions (Fe-10 at.% Cu, and Cu-2.5 at.% Fe). Fe – Cu is among the most attractive systems for technical application since it exhibits the Invar effect. Additionally it serves as a binary model system and hence is representative for those immiscible systems characterised by a large positive heat of mixing. Results on the extension of the solubility limits up to 10 at.% and on the homogeneity of the alloy – depending on composition and milling time – are presented, discussed and compared to earlier works. Chemical homogeneity of the sample as measured by the atom probe was never fully reached on the nano-scale, even for the longest milling time and for those samples which appear to be homogeneous via X-ray analysis. Furthermore, impurities such as oxygen, stemming from the preparation procedure, were frequently detected and analysed for the different samples. In addition, structural characterisation was performed using transmission electron microscopy and diffraction measurements to confirm the transition of Fe from bcc to fcc. Thus, nano-scale information on the local concentration, segregation effects and the distribution of impurities for the different nominal compositions and processing parameters could be gained.

Keywords: Mechanical alloying; Atom-probe-tomography (APT); Nano-crystalline; Fe – Cu; Powders
* Correspondence address, PD Dr. Taláat Al-Kassab, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany, Tel.: +49 551 39 5017, Fax: +49 551 39 5012, E-mail:

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Received: 2007-11-26
Accepted: 2008-2-29
Published Online: 2013-05-23
Published in Print: 2008-05-01

© 2008, Carl Hanser Verlag, München

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  1. Contents
  2. Contents
  3. Editorial
  4. Prof. Dr. Reiner Kirchheim
  5. Review
  6. Laser-assisted atom probe tomography and nanosciences
  7. Heusler films and multilayers: X-ray resonant magnetic scattering and polarized neutron reflectivity studies on the relation between structure and magnetism
  8. Perovskite-type hydrides – synthesis, structures and properties
  9. Basic
  10. Interface width of immiscible layered elements
  11. The decomposition reaction of lithium amide studied by anelastic spectroscopy and thermogravimetry
  12. Migration of faceted high-angle grain boundaries in Zn
  13. EELS analysis of internal metal – oxide interfaces
  14. Effect of Chemical Confinement on the mechanical relaxation spectra of poly(ethene-co-methacrylic acid) copolymers
  15. Applied
  16. Properties of hydrogen absorption by nano-structured FeTi alloys
  17. A subnanoscale study of the nucleation, growth, and coarsening kinetics of Cu-rich precipitates in a multicomponent Fe – Cu based steel
  18. Hydrogen absorption in 3.1 nanometre sized palladium samples: does structure matter?
  19. Ultrasonic study of short-range hydrogen ordering in Pd-hydride
  20. Homogeneity of mechanically alloyed nano-crystalline Fe – Cu-powders
  21. Formation of nickel nanoparticles in nickel – ceramic anodes during operation of solid-oxide fuel cells
  22. Characterisation of complex hydrides synthesised or modified by ball milling
  23. On the small scale character of the stress and hydrogen concentration fields at the tip of an axial crack in steel pipeline: effect of hydrogen-induced softening on void growth
  24. Notifications
  25. DGM News
https://doi.org/10.3139/146.101668
Keywords for this article
Mechanical alloying; Atom-probe-tomography (APT); Nano-crystalline; Fe – Cu; Powders

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Prof. Dr. Reiner Kirchheim
  5. Review
  6. Laser-assisted atom probe tomography and nanosciences
  7. Heusler films and multilayers: X-ray resonant magnetic scattering and polarized neutron reflectivity studies on the relation between structure and magnetism
  8. Perovskite-type hydrides – synthesis, structures and properties
  9. Basic
  10. Interface width of immiscible layered elements
  11. The decomposition reaction of lithium amide studied by anelastic spectroscopy and thermogravimetry
  12. Migration of faceted high-angle grain boundaries in Zn
  13. EELS analysis of internal metal – oxide interfaces
  14. Effect of Chemical Confinement on the mechanical relaxation spectra of poly(ethene-co-methacrylic acid) copolymers
  15. Applied
  16. Properties of hydrogen absorption by nano-structured FeTi alloys
  17. A subnanoscale study of the nucleation, growth, and coarsening kinetics of Cu-rich precipitates in a multicomponent Fe – Cu based steel
  18. Hydrogen absorption in 3.1 nanometre sized palladium samples: does structure matter?
  19. Ultrasonic study of short-range hydrogen ordering in Pd-hydride
  20. Homogeneity of mechanically alloyed nano-crystalline Fe – Cu-powders
  21. Formation of nickel nanoparticles in nickel – ceramic anodes during operation of solid-oxide fuel cells
  22. Characterisation of complex hydrides synthesised or modified by ball milling
  23. On the small scale character of the stress and hydrogen concentration fields at the tip of an axial crack in steel pipeline: effect of hydrogen-induced softening on void growth
  24. Notifications
  25. DGM News
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