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Precipitation of Co from supersaturated Au90Co10: microstructure and kinetics

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Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 102 Issue 8

Abstract

The kinetics of the precipitation of Co from a supersaturated solid solution of Au-10.12 at.% Co was investigated by differential scanning calorimetry upon isothermal annealing at temperatures in the range from 567 K to 612 K and upon isochronal annealing at heating rates between 5 K min−1 and 40 K min−1. The microstructural evolution during the course of precipitation was traced by (high-resolution) transmission electron microscopy, scanning electron microscopy, X-ray diffraction and hardness measurements. First, the exothermic formation of 0.5 – 1 nm thin plate-like bcc Co precipitates takes place parallel to {100} habit planes of the Au-matrix. Upon continued annealing, equiaxed fcc Co particles in epitaxial orientation with the Au lattice occur by a Bain-type transformation of the Co particles from the bcc to the fcc lattice structure associated with loss of coherency. Fitting of a modular model of transformation kinetics (Liu et al., Int. Mat. Rev. 52 (2007) 193) simultaneously to the first peak of all isothermal differential scanning calorimetry runs and simultaneously to the first peak of all isochronal differential scanning calorimetry runs demonstrated that the nucleation of bcc Co plates is governed by site saturation in the case of isothermal annealing and continuous nucleation in the case of isochronal annealing, and by linear growth for both isothermal and isochronal annealing. The activation energy for growth is remarkably small due to the presence of quenched-in vacancies. Recovery prior to precipitation leads to a change of the nucleation mechanism from site saturation to continuous nucleation as well as an increase in the activation energy for growth.

Keywords: Gold-cobalt; Precipitation; Microstructure; Transformation kinetics; Modeling
* Correspondence address, Prof. E. J. Mittemeijer, Max Planck Insitute for Intelligent Systems (formerly Max Planck Institute for Metals Research), Heisenbergstr. 3, 70569 Stuttgart, Germany, Tel.: +49 (0) 711 689 3311, Fax: +49 (0) 711 689 3312, E-mail:

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Received: 2010-5-17
Accepted: 2011-6-6
Published Online: 2013-06-11
Published in Print: 2011-08-01

© 2011, Carl Hanser Verlag, München

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  20. Precipitation of Co from supersaturated Au90Co10: microstructure and kinetics
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https://doi.org/10.3139/146.110556
Keywords for this article
Gold-cobalt; Precipitation; Microstructure; Transformation kinetics; Modeling

Articles in the same Issue

  1. Contents
  2. Contents
  3. Award/Preisverleihung
  4. The Werner-Köster-Preis 2009
  5. Editorial
  6. Laudatio zum 65. Geburtstag von Univ. Prof.-Ing. habil. Bernhard Wielage
  7. Review
  8. Humboldt oder Bologna zum Dilemma der Bildung in der Ausbildung
  9. Original Contributions
  10. Plasma generators for thermal plasma processes
  11. Boron and phosphorous free nickel-based filler metals for brazing stainless steel in shielding gas furnaces
  12. Thermochemistry of brazing ceramics and metals in air
  13. Controlled grain size distribution and refinement of an EN AW-6082 aluminium alloy
  14. The effect of ball milling and wet blending on the creep behaviour of a particle reinforced 2124 Al-alloy
  15. Theoretical aspects of hot forming of sheet metals with graded characteristics
  16. Assessment of hot cracking behaviour in welds
  17. Sliding wear behaviour of diamond-like carbon (DLC) coatings deposited on plasma nitrided steels
  18. The effect of layer structure on corrosion and erosion resistance of thin PVD multilayer films
  19. Consolidation behaviour during manufacture of adapted piezoceramic modules for functional integrated thermoplastic composite structures
  20. Precipitation of Co from supersaturated Au90Co10: microstructure and kinetics
  21. Phase equilibria in the Fe–Mg–Si system
  22. Hydrothermal deposition of single crystalline germanium nanorods
  23. Application of the Taguchi approach to investigate the softening kinetics of AISI 304 stainless steel during hot deformation
  24. DGM News
  25. DGM News
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