کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
674307 1459557 2012 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Thermodynamic description of the Al–Mg–Si system using a new formulation for the temperature dependence of the excess Gibbs energy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
Thermodynamic description of the Al–Mg–Si system using a new formulation for the temperature dependence of the excess Gibbs energy
چکیده انگلیسی

An exponential formulation was proposed to replace the linear interaction parameter in the Redlich–Kister (R–K) polynomial for the excess Gibbs energy of ternary solution phase. The theoretical analysis indicates that the proposed new exponential formulation can not only avoid the artificial miscibility gap at high temperatures but also describe the ternary system well. A thermodynamic description for the Al–Mg–Si system and its boundary binaries was then performed by using both R–K linear and exponential formulations. The inverted miscibility gaps occurring in the Mg–Si and the Al–Mg–Si systems at high temperatures due to the use of R–K linear polynomials are avoided by using the new formulation. Besides, the thermodynamic properties predicted with the new formulation confirm the general thermodynamic belief that the solution phase approaches to the ideal solution at infinite temperatures, which cannot be described with the traditional R–K linear polynomials.


► An exponential formulation to describe ternary excess Gibbs energy is proposed.
► Theoretical analysis is performed to verify stability of phase using new formulation.
► Al–Mg–Si system and its boundary binaries have been assessed by the new formulation.
► Present calculations for Al–Mg–Si system are more reasonable than previous ones.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 527, 10 January 2012, Pages 131–142
نویسندگان
, , , , ,