کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1600479 1515885 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Calculation of glass forming ranges in the ternary Y–Cu–Al system and its sub-binaries based on geometric and Miedema's models
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Calculation of glass forming ranges in the ternary Y–Cu–Al system and its sub-binaries based on geometric and Miedema's models
چکیده انگلیسی

A method based on the semi-empirical Miedema's and geometric models was used for the first time to calculate glass forming abilities (GFA) and the glass forming ranges in a ternary system and its sub-binaries. This work incorporates calculations of the formation enthalpies of amorphous alloys and their crystalline (solid solution) counterparts, as well as differences between them for the Y–Cu–Al system. Results indicate that compositions close to Y–Al and Y–Cu sub-binaries exhibit the highest GFA values. In addition, from the normalized entropy change Sσ/kB, the highest GFA was predicted for sub-binaries close to Y–Cu. In both cases, Y atoms play an important role, due to their large atomic radii and highly negative interfacial enthalpies with other constituents. The glass forming ability parameter ΔPHS (which includes both the enthalpy and entropy changes) indicates the range with the highest GFA in the vicinity of the Y40Cu31Al29 alloy composition. The predicted values are in a good agreement with experimental ones as well as with other theoretical results.


► Glass forming abilities (GFA) and the glass forming ranges in Y–Cu–Al ternary system.
► Calculations based on Miedema's and geometric models.
► Effects of atomic radius differences estimated by a mismatch entropy calculations.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 26, July 2012, Pages 72–77
نویسندگان
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