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SPECIAL TOPIC — Amorphous physics and materials
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SPECIAL TOPIC—Amorphous physics and materials |
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Effect of icosahedral clusters on β-relaxations in metallic glasses |
X Q Gao(高选乔)1, Y T Sun(孙奕韬)1, Z Wang(王峥)1, M Z Li(李茂枝)2, H Y Bai(白海洋)1 |
1. Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2. Department of Physics, Renmin University of China, Beijing 100872, China |
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Abstract The most pronounced β-relaxation was found in the Y-based binary metallic glasses (MGs). The correlation between β-relaxation and local atomic structure was studied. The dynamic mechanical measurements were performed for three chosen binary systems:Zr-, Ti-, and Y-based MGs. The experimental results show that, in each system,the larger negative enthalpy of mixing (ΔHm) between the component elements makes β-relaxation become more pronounced. The less negative value of ΔHm facilitates the formation of icosahedral clusters, which have a pinning effect on the excitation of β-relaxations and correspondingly make the β-relaxation become less pronounced. These chemical effects on β-relaxations can only be compared in the same MG system, and it is not suitable for the comparison between different systems due to the different features of the major metallic elements.
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Received: 13 September 2016
Revised: 12 October 2016
Accepted manuscript online:
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PACS:
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61.25.Mv
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(Liquid metals and alloys)
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61.20.Ne
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(Structure of simple liquids)
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64.70.pe
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(Metallic glasses)
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62.40.+i
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(Anelasticity, internal friction, stress relaxation, and mechanical resonances)
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Fund: Project supported by the National Basic Research Program of China (Grant No. 2010CB731603) and the National Natural Science Foundation of China (Grant Nos. 50921091 and 51071170). |
Corresponding Authors:
H Y Bai
E-mail: hybai@aphy.iphy.ac.cn
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Cite this article:
X Q Gao(高选乔), Y T Sun(孙奕韬), Z Wang(王峥), M Z Li(李茂枝), H Y Bai(白海洋) Effect of icosahedral clusters on β-relaxations in metallic glasses 2017 Chin. Phys. B 26 016101
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