ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Thermodynamic assessment of the Al-Cr system has been carried out by incorporatingfirst-principles calculations into the CALPHAD approach. A regular solution approximation wasadopted to describe the Gibbs energy of the solution phases. The several phases appearing in thecomposition 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 thefour-sublattice model with the formula (Al,Cr)8(Al,Cr)8(Cr)12(Al)24. The calculated results enable thereproduction of experimental results on both the phase equilibria and thermochemical properties. Inaddition, a B2 ordered bcc phase, which was suggested to form as an equilibrium phase in a previousX-ray diffraction study, is not likely to form in either the stable state or metastable state based on ourfirst-principles calculations
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.2407.pdf
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