Unexpected non-monotonic changing in the heterogeneity of glasses during annealing

Yu Tong ¹Fucheng Li ²Lijian Song ¹Yanhui Liu ²Juntao Huo ¹Jichao Qiao ³Yao Yao ³J.M.Pelletier ⁴Daniel Crespo ⁵Eloi Pineda ⁵Jun-Qiang Wang¹

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作者信息

1. CAS Key Laboratory of Magnetic Materials and Devices,and Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China
2. Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
3. School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi'an 710072,China
4. Mateis,UMR CNRS5510,INSA-Lyon,Université de Lyon,Villeurbanne cedex F-69621,France
5. Department of Physics,Institute of Energy Technologies,Universitat Politècnica de Catalunya,Barcelona 08019,Spain
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Abstract

The heterogeneity of glasses has critical influences on the properties.How heterogeneity evolves during annealing is an intriguing cutting-edge question.In this work,the heterogeneity of the annealed metal-lic and polymer glasses has been studied systematically by using stress relaxation and nanoindentation tests.The stress relaxation processes are analyzed using Kohlrausch-Williams-Watts(KWW)equation.We surprisingly find that the heterogeneous factor βkww in KWW equation does not change monotonously but increases first and then decreases along with the annealing time.The two-stage process implies that glasses do not evolve as expected toward the more homogeneous glassy state but become homogeneous first and then more heterogeneous.This is further verified by the evolution of critical shear stress for local plasticity.It is revealed that the two-stage process is correlated with different relaxation modes,which is further interpreted using a phenomenological model.These findings not only give insights into understanding the nature of glasses,but also are useful for designing glasses with superior properties.

Key words

Glasses/Heterogeneity/Aging/Relaxation

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基金项目

National Natural Science Foundation of China(52201193)

National Natural Science Foundation of China(51922102)

National Natural Science Foundation of China(92163108)

National Natural Science Foundation of China(52001319)

National Key R&D Program of China(2018YFA0703600)

Ningbo Natural Science Foundation of Ningbo City(2022J310)

the"Pioneer and Leading Goose"R&D Program of Zhejiang(2022C01023)

'Proyecto PID2020-112975GB-I00 de investigación financiado por MCIN/AEI/10.13039/501100011033'()

Generalitat de Catalunya AGAUR grant(2017-SGR-42)

出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCD

影响因子：0.657

ISSN：1005-0302

参考文献量66

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