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Interrelationships of defects, nitride modification and excess nitrogen in nitrided Fe-4.75 at.% Al alloy

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Published/Copyright: November 17, 2014
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 105 Issue 11

Abstract

In order to investigate the influence of crystal-lattice defects (dislocations) and of a relatively large Al content on the development of different modifications of aluminium nitride in ferrite and on the associated uptake of excess nitrogen, recrystallised and cold rolled specimens of Fe-4.75 at.% Al alloy were subjected to gaseous nitriding treatments at 550 °C employing a nitriding potential of 0.104 atm−1/2. In contrast with earlier results for an alloy of relatively low Al content, in both the nitrided cold rolled and the nitrided recrystallised specimens nanosized AlN precipitates developed, both of the metastable, cubic, NaCl type modification and of the stable, hexagonal, wurtzite type modification, which exhibit with the ferrite matrix a Baker–Nutting orientation relationship and a Pitsch–Schrader orientation relationship, respectively. A high-temperature hydrogen reduction treatment confirmed the stoichiometry of the precipitated nitrides as AlN. The fraction of cubic, NaCl type, AlN is significantly higher in the nitrided cold-rolled specimens because of its preferential development along dislocations. As compared to the nitrided recrystallised specimens, the higher dislocation density and the higher amount of cubic AlN in the nitrided cold-rolled specimens leads to a larger amount of excess nitrogen in the nitrided cold-rolled specimen.

Keywords: AlN-modification; Excess nitrogen; Dislocations; Misfit-strain; Nitriding
* Correspondence address, Dr. Sai Ramudu Meka, Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart, Germany. Tel.: +49-711-6893353, Fax: +49-711-6893312, E-mail:

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Received: 2014-03-20
Accepted: 2014-05-28
Published Online: 2014-11-17
Published in Print: 2014-11-10

© 2014, Carl Hanser Verlag, München

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Thermodynamic description of the Ta–W–Zr system
  5. Interrelationships of defects, nitride modification and excess nitrogen in nitrided Fe-4.75 at.% Al alloy
  6. Effects of rotating magnetic and ultrasonic fields on the microstructure and mechanical properties of Al-8 wt.%Si alloy
  7. Microstructural control of Ti-46Al-7Nb-0.7Cr-0.2Ni-0.1Si alloy by heat treatment
  8. Structure and mechanical properties of Zn-(5–25) Al alloys
  9. Hot ductility behavior of near-alpha titanium alloy IMI834
  10. The effect of nano-SiO2 on magnetic and dielectric properties of Li–Zn ferrite
  11. Production of aluminum nano-composite reinforced by tungsten carbide particles via mechanical milling and subsequent hot pressing
  12. Short Communications
  13. Microstructure and texture evolution of Mg–Li alloy during rolling
  14. Microstructure and mechanical properties of Ti2AlC-reinforced TiAl composites
  15. Thermal fatigue behavior of cast superalloy Inconel 713LC
  16. Study of structural, morphological and optical properties of S and Cu co-doped SnO2 nanostructured thin films prepared by spray pyrolysis
  17. Synthesis and characterization of zirconium nitride coatings by cathodic arc sputtering technique
  18. Plasmon enhanced scattering and fluorescence in amorphous matrix
  19. Novel preparation of a porous composite insulating scaffold from forsterite and sodium carbonate media
  20. People
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  23. DGM News
https://doi.org/10.3139/146.111127
Keywords for this article
AlN-modification; Excess nitrogen; Dislocations; Misfit-strain; Nitriding

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Thermodynamic description of the Ta–W–Zr system
  5. Interrelationships of defects, nitride modification and excess nitrogen in nitrided Fe-4.75 at.% Al alloy
  6. Effects of rotating magnetic and ultrasonic fields on the microstructure and mechanical properties of Al-8 wt.%Si alloy
  7. Microstructural control of Ti-46Al-7Nb-0.7Cr-0.2Ni-0.1Si alloy by heat treatment
  8. Structure and mechanical properties of Zn-(5–25) Al alloys
  9. Hot ductility behavior of near-alpha titanium alloy IMI834
  10. The effect of nano-SiO2 on magnetic and dielectric properties of Li–Zn ferrite
  11. Production of aluminum nano-composite reinforced by tungsten carbide particles via mechanical milling and subsequent hot pressing
  12. Short Communications
  13. Microstructure and texture evolution of Mg–Li alloy during rolling
  14. Microstructure and mechanical properties of Ti2AlC-reinforced TiAl composites
  15. Thermal fatigue behavior of cast superalloy Inconel 713LC
  16. Study of structural, morphological and optical properties of S and Cu co-doped SnO2 nanostructured thin films prepared by spray pyrolysis
  17. Synthesis and characterization of zirconium nitride coatings by cathodic arc sputtering technique
  18. Plasmon enhanced scattering and fluorescence in amorphous matrix
  19. Novel preparation of a porous composite insulating scaffold from forsterite and sodium carbonate media
  20. People
  21. Werner Mader, 65 years
  22. DGM News
  23. DGM News
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