کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7952069 1513707 2018 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Diffusion behavior and reactions between Al and Ca in Mg alloys by diffusion couples
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد شیمی مواد
پیش نمایش صفحه اول مقاله
Diffusion behavior and reactions between Al and Ca in Mg alloys by diffusion couples
چکیده انگلیسی
The diffusion behavior and reactions between Al and Ca in Mg alloys by diffusion couple method were investigated. Results demonstrate that Al2Ca is the only phase existing in the diffusion reaction layers. The volume fraction of Al2Ca in diffusion reaction layers increases linearly with temperature. The standard enthalpy of formation for intermetallic compounds was rationalized on the basis of the Miedema model. Al-Ca intermetallic compounds were preferable to form in the Mg-Al-Ca ternary system under the same conditions. Over the range of 350-400 °C, the structure of Al2Ca is more stable than that of Al4Ca, Al14Ca13and Al3Ca8. The growth constants of the layer I, layer II and entire diffusion reaction layers were determined. The activation energies for the growth of the layer I, layer II and entire diffusion reaction layers were (80.74 ± 3.01) kJ/mol, (93.45 ± 2.12) kJ/mol and (83.52 ± 1.50) kJ/mol, respectively. In layer I and II, Al has higher integrated interdiffusion coefficients D˜iInt,layer than Ca. The average effective interdiffusion coefficients D˜Aleff values are higher than D˜Caeffin the layer I and II.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Materials Science & Technology - Volume 34, Issue 2, February 2018, Pages 291-298
نویسندگان
, , , , , , , , ,