Journal
CALPHAD-COMPUTER COUPLING OF PHASE DIAGRAMS AND THERMOCHEMISTRY
Volume 54, Issue -, Pages 134-143Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.calphad.2016.07.003
Keywords
hcp Mg-Al-Zn ternary system; Darken-type couple; Atomic mobility; DICTRA
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Funding
- European Research Council (ERC) under European Union's Horizon 2020 research and innovation programme (Advanced Grant VIRMETAL) [669141]
- China Scholarship Council [201506890002]
- National Natural Science Funds of China [51571113]
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The experimental data in the literature for the hcp phase of the Mg-Al-Zn ternary system have been critically reviewed. Based on the concentration profiles from the literature, the diffusion coefficients have been re-extracted using the Hall method for the impurity diffusion, and the Sauer-Freise and the Whittle-Green strategies for interdiffusion coefficients in binary and ternary systems, respectively. Moreover, extra interdiffusion coefficients were obtained from the Darken-type couples, which present relative maxima or/and minima at the concentration profiles. This information was assessed to obtain an atomic mobility database, by means of DICTRA software in conjunction with the CALPHAD thermodynamic description that is able to reproduce the diffusion couple experiments. Comprehensive comparisons between the calculated results and experimental values show an excellent agreement not only for the diffusion coefficient data, but also for the concentration profiles and the diffusion paths. (C) 2016 Elsevier Ltd. All rights reserved.
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