Elemental distribution, solute solubility and defect free volume in nanocrystalline restricted-equilibrium Cu–Ag alloys

T. Riedl, A. Kirchner, K. Eymann, A. Shariq, R. Schlesiger, G. Schmitz, M. Ruhnow, B. Kieback, Journal of Physics: Condensed Matter 25 (2013).

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Abstract
In this article we study the elemental distribution and solute solubility in nanocrystalline alloys of immiscible components near restricted equilibrium for the case of the binary Cu–Ag system. As predicted from thermodynamic considerations, a grain boundary segregated monophase alloy is observed in the annealed mechanically alloyed state for low Ag content by using atom probe tomography. From the detected Ag solute grain boundary enrichment the segregation free enthalpy is estimated to range between -25 and -49 kJ mol^-1 following the McLean equation, in agreement with values reported for coarse-grained Cu–Ag. The extension of the alloying range is described by a two-domain thermodynamic model that considers the excess free volume in the grain boundaries and the strain in the strain interior on the basis of the universal equation of state at negative pressure. To access the grain boundary volumetric strain experimentally, a method based on a combination of density measurements and microscopical quantification of closed pore areas is presented. Moreover, we apply x-ray diffraction line broadening analysis to determine the local strain amplitude, which yields a root-mean-square microstrain of 0.3% for a grain size of 30 nm. It is shown that the grain boundary free volume represents the major origin for the global solubility enhancement in nanocrystalline Cu–Ag at 503 K.
Publishing Year
Journal Title
Journal of Physics: Condensed Matter
Volume
25
Issue
11
Article Number
115401 (9 pp.)
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Riedl T, Kirchner A, Eymann K, et al. Elemental distribution, solute solubility and defect free volume in nanocrystalline restricted-equilibrium Cu–Ag alloys. Journal of Physics: Condensed Matter. 2013;25(11). doi:10.1088/0953-8984/25/11/115401
Riedl, T., Kirchner, A., Eymann, K., Shariq, A., Schlesiger, R., Schmitz, G., … Kieback, B. (2013). Elemental distribution, solute solubility and defect free volume in nanocrystalline restricted-equilibrium Cu–Ag alloys. Journal of Physics: Condensed Matter, 25(11). https://doi.org/10.1088/0953-8984/25/11/115401
@article{Riedl_Kirchner_Eymann_Shariq_Schlesiger_Schmitz_Ruhnow_Kieback_2013, title={Elemental distribution, solute solubility and defect free volume in nanocrystalline restricted-equilibrium Cu–Ag alloys}, volume={25}, DOI={10.1088/0953-8984/25/11/115401}, number={11115401 (9 pp.)}, journal={Journal of Physics: Condensed Matter}, publisher={IOP Publishing}, author={Riedl, Thomas and Kirchner, A and Eymann, K and Shariq, A and Schlesiger, R and Schmitz, G and Ruhnow, M and Kieback, B}, year={2013} }
Riedl, Thomas, A Kirchner, K Eymann, A Shariq, R Schlesiger, G Schmitz, M Ruhnow, and B Kieback. “Elemental Distribution, Solute Solubility and Defect Free Volume in Nanocrystalline Restricted-Equilibrium Cu–Ag Alloys.” Journal of Physics: Condensed Matter 25, no. 11 (2013). https://doi.org/10.1088/0953-8984/25/11/115401.
T. Riedl et al., “Elemental distribution, solute solubility and defect free volume in nanocrystalline restricted-equilibrium Cu–Ag alloys,” Journal of Physics: Condensed Matter, vol. 25, no. 11, 2013.
Riedl, Thomas, et al. “Elemental Distribution, Solute Solubility and Defect Free Volume in Nanocrystalline Restricted-Equilibrium Cu–Ag Alloys.” Journal of Physics: Condensed Matter, vol. 25, no. 11, 115401 (9 pp.), IOP Publishing, 2013, doi:10.1088/0953-8984/25/11/115401.
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