Browsing by Author "Djaballah, Y."

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    The Effect Of Excess Energy In The Simulation Of Dendritic Growth Using The Phase Field Model Coupled With A Calphad Database.
    (Oum-El-Bouaghi University, 2016) Kerboub, A.; Belbacha, E.; Bouzida, A. B; Hidoussi, A.; Djaballah, Y.
    In this work, we aim to use the Warren-Boettinger model for isothermal solidification to predict the dendritic growth in binary alloys; using the phase field method coupled with a CALPHAD database (CALculation of PHase Diagram). The main benefit of this work is to study the effect of the excess energy in the phenomena of dendritic growth for the real solution. We took in consideration, the contribution of the regular solution interaction parameter associated with the excess energy of mixing solid and liquid in the phase field equation and the concentration equation . The model we proposed is able to simulate the microstructural evolution of the real solution Ni-Cu by linking directly the phase field model to the CALPHAD thermodynamic database. The comparison of the numerical calculations for the Ni-Cu real solution and the Ni-Cu ideal solution shows that the addition of the excess energy has an important effect on the dendrite form.
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    Thermodynamic descriptions of the phase diagram and thermodynamic properties of the Bi–K binary system
    (Oum-El-Bouaghi University, 2022) Dziri, F.; Belbacha, E.; Djaballah, Y.; Belgacem Bouzida, A.
    The Bi-K binary system is reassessed by coupling CALPHAD approach and first principles calculations. The calculated lattice parameters and enthalpies of formation have been obtained from density functional theory as implemented in the VASP (Vienna Ab-initio Simulation Package) code. The whole system is optimized by CALPHAD method, where the liquid solution is described by the associate model and the binary compounds are described as stoichiometric phases. A good agreement has been obtained between the experimental data, first principles calculation and the thermodynamic optimization