کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1612063 1516304 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Dynamic universal characteristic of the main (α) relaxation in bulk metallic glasses
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Dynamic universal characteristic of the main (α) relaxation in bulk metallic glasses
چکیده انگلیسی
The main (α) relaxation in typical metallic glasses was studied by dynamic mechanic analysis (DMA). Experimental results indicate that the main relaxation is a common feature in all the metallic glasses as well as other glassy-like materials. Initially, experimental results are analyzed using the Kohlrausch-Williams-Watts (KWW) phenomenological model. The Kohlrausch exponent βKWW is around 0.5 near their glass transition domain. In addition, it is shown that the dynamic mechanical behavior in metallic glasses is in agreement with the predictions of the physical model called the quasi-point defects (QPDs) theory. In this model a correlation parameter (χ) is introduced, which is correlated to the disorder degree. The results on the main relaxation of the metallic glasses emphasize a striking correlation between quasi-point defects theory and KWW model: χ ≈ 0.8βKWW. This relation provides new insight of the non-exponential dynamic character for the amorphous materials.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 589, 15 March 2014, Pages 263-270
نویسندگان
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