Numerical Prediction of the Thermodynamic Properties of Ternary Al-Ni-Pd Alloys

作者：Zagula Yavorska Maryana^*; Romanowska Jolanta; Kotowski Slawomir; Sieniawski Jan

来源：High Temperature Materials and Processes, 2016, 35(1): 37-45.

DOI：10.1515/htmp-2014-0112

• thermodynamics
• modeling
• Al-Ni-Pd alloy

Thermodynamic properties of ternary Al-Ni-Pd system, such as (ex)G(AlNPd), mu(Al(AlNiPd),) mu(Ni(AlNiPd)) and mu(Pd(AlNiPd)) at 1,373 K, were predicted on the basis of thermodynamic properties of binary systems included in the investigated ternary system. The idea of predicting (ex)G(AlNiPd) values was regarded as calculation of values of the (ex)G function inside a certain area (a Gibbs triangle) unless all boundary conditions, that is values of (ex)G on all legs of the triangle are known ((ex)G(AlNi), (ex)G(AlPd), (ex)G(NiPd)). This approach is contrary to finding a function value outside a certain area, if the function value inside this area is known. (ex)G and L-Al,(Ni),(Pd) ternary interaction parameters in the Muggianu extension of the Redlich-Kister formalism were calculated numerically using the Excel program and Solver. The accepted values of the third component chi(x) differed from 0.01 to 0.1 mole fraction. Values of L-AlNiPd parameters in the Redlich-Kister formula are different for different chi(x) values, but values of thermodynamic functions: (ex)G(AlNiPd), mu(Al(AlNiPd)), mu(Ni(AlNiPd)) and mu(Pd(AlNiPd)) do not differ significantly for different chi(x) values. The choice of chi(x) value does not influence the accuracy of calculations.

• 出版日期2016-1