首页|Quasi-two-dimensional strong liquid-like dynamics of surface atoms in metallic glasses

Quasi-two-dimensional strong liquid-like dynamics of surface atoms in metallic glasses

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The fast dynamic properties of the surface of metallic glasses(MGs)play a critical role in determining their potential appli-cations.However,due to the significant difference in thermal history between atomic simulation models and laboratory-made samples,the atomic-scale behaviors of the fast surface dynamics of MGs in experiments remain uncertain.Herein,we prepared model MG films with notable variations in thermal stability using a recently developed effiicient annealing protocol,and investigated their atomic-scale dynamics systematically.We found that the dynamics of surface atoms remain invariant,whereas the difference in dynamical heterogeneity between surface and interior regions increases with the improvement of thermal stability.This can be associated with the more pronounced correlation between atomic activation energy spectra and depth from the surface in samples with higher thermal stability.In addition,dynamic anisotropy appears for surface atoms,and their transverse dynamics are faster than normal components,which can also be interpreted by activation energy spectra.Our results reveal the presence of strong liquid-like atomic dynamics confined to the surface of laboratory-made MGs,illuminating the underlying mechanisms for surface engineering design,such as cold joining by ultrasonic vibrations and superlattice growth.

metallic glassesthermal stabilityinvariant surface dynamicspotential energy landscapedynamic anisotropy and heterogeneity

Bing Wang、Xuanqiao Gao、Rui Su、Pengfei Guan

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School of Physical Science and Technology Northwestern Polytechnical University,Xi,an 710072,China

Innovation Center NPU Chongqing,Northwestern Polytechnical University,Chongqing 401135,China

School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi,an 710072,China

Northwest Institute for Nonferrous Metal Research,Xi,an 710016,China

Institute of Advanced Magnetic Materials,College of Materials and Environmental Engineering,Hangzhou Dianzi University,Hangzhou 310018,China

Beijing Computational Science Research Center,Beijing 100093,China

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国家自然科学基金重庆市自然科学基金Science Fund for Scientific and Technological Innovation Team of Shaanxi Province国家自然科学基金国家自然科学基金Beijing Computational science Research Center(CSRC)

52101201cstc202ljcyjmsxmX03692021TD-14T232500451801046

2024

10.1007/s11433-023-2273-6

中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
年,卷(期)：2024.67(3)
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