کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1560502 1513919 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Prediction of diffusivities in fcc phase of the Al-Cu-Mg system: First-principles calculations coupled with CALPHAD technique
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مکانیک محاسباتی
پیش نمایش صفحه اول مقاله
Prediction of diffusivities in fcc phase of the Al-Cu-Mg system: First-principles calculations coupled with CALPHAD technique
چکیده انگلیسی
The diffusivities in fcc phase of the Al-Cu-Mg system are systematically predicted via first-principles calculations coupled with CALPHAD (CALculation of PHAse Diagram) technique. All the self- and impurity diffusion coefficients of fcc phase in this ternary system, including both stable and meta-stable states, are calculated via first-principles calculations. The enthalpy of vacancy formation and migration, binding enthalpy of vacancy-solute, entropy of vibration, effective atomic jump frequency, as well as the pre-factors and activation energies for diffusion in the Arrhenius equation are obtained. The atomic mobilities of the three elements are then obtained based on the first-principles calculated diffusion coefficients. Moreover, the interdiffusion coefficients of the Al-Cu, Al-Mg and Cu-Mg binary systems are calculated by means of the DICTRA (DIffusion-Controlled TRAnsformation) package in the framework of CALPHAD approach. Comprehensive comparisons between the predicted and measured diffusivities show that most of the experimental data can be well reproduced. It is found that the combination of first-principles calculations and CALPHAD technique is an effective strategy to obtain diffusivities for multicomponent systems.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 90, July 2014, Pages 32-43
نویسندگان
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