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
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
شیمی مواد
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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 DËiInt,layer than Ca. The average effective interdiffusion coefficients DËAleff values are higher than DËCaeffin 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
Journal: Journal of Materials Science & Technology - Volume 34, Issue 2, February 2018, Pages 291-298
نویسندگان
Jiahong Dai, Hong Xiao, Bin Jiang, Hongmei Xie, Cheng Peng, Zhongtao Jiang, Qin Zou, Qingshan Yang, Fusheng Pan,