Paper Title:
Thermodynamic Assessment of the Al-Cr System by Combining the First Principles and CALPHAD Methods
  Abstract

Thermodynamic assessment of the Al-Cr system has been carried out by incorporating first-principles calculations into the CALPHAD approach. A regular solution approximation was adopted to describe the Gibbs energy of the solution phases. The several phases appearing in the composition range between about 30 and 42 at.%Cr were treated as a single homogeneous γ-phase, based on recent experimental results, and the Gibbs energy of the γ-phase was represented using the four-sublattice model with the formula (Al,Cr)8(Al,Cr)8(Cr)12(Al)24. The calculated results enable the reproduction of experimental results on both the phase equilibria and thermochemical properties. In addition, a B2 ordered bcc phase, which was suggested to form as an equilibrium phase in a previous X-ray diffraction study, is not likely to form in either the stable state or metastable state based on our first-principles calculations.

  Info
Periodical
Materials Science Forum (Volumes 539-543)
Main Theme
Edited by
T. Chandra, K. Tsuzaki, M. Militzer , C. Ravindran
Pages
2407-2412
DOI
10.4028/www.scientific.net/MSF.539-543.2407
Citation
T. Tokunaga, H. Ohtani, M. Hasebe, "Thermodynamic Assessment of the Al-Cr System by Combining the First Principles and CALPHAD Methods", Materials Science Forum, Vols. 539-543, pp. 2407-2412, 2007
Online since
March 2007
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