کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7988345 | 1515817 | 2018 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Activation-relaxation technique study on β-relaxation in La55Ni20Al25 and Cu46Zr46Al8 metallic glasses
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Activation-relaxation technique combined with molecular dynamics simulations was employed to investigate β-relaxation behavior in La55Ni20Al25 and Cu46Zr46Al8 model metallic glasses (MGs) for exploring the underlying mechanism. It is found that the activation energies are much smaller in La55Ni20Al25â¯MG, indicating that β-relaxation can be more easily activated in La55Ni20Al25â¯MG. It is also revealed that in both MGs, string-like diffusion dominates the atomic motions in β-relaxation. However, in different MGs, the string-like motions are found to involve atoms with different structure features, which could be the underlying structural basis of β-relaxation mechanism. In addition, because of very low activation energies, atomic hopping and cooperative rearrangements in La55Ni20Al25â¯MG also have significant impact on β-relaxation. However, such atomic motions are much weaker in Cu46Zr46Al8 MG, due to higher activation energies. These findings establish a physical link for activation energy and atomic motions in β-relaxation to atomic structures, and provide new understanding of β-relaxation mechanism in MGs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 94, March 2018, Pages 10-16
Journal: Intermetallics - Volume 94, March 2018, Pages 10-16
نویسندگان
H.Y. Xu, M.Z. Li,