Natl Sci Open
Volume 2, Number 3, 2023
Special Topic: Glasses—Materials and Physics
|Number of page(s)||12|
|Published online||20 April 2023|
Generalization of the Hall-Petch and inverse Hall-Petch behaviors by tuning amorphous regions in 2D solids
1 Department of Physics, The Hong Kong University of Science and Technology, Hong Kong 999077, China
2 Function Hub, The Hong Kong University of Science and Technology (Guangzhou), Guangzhou 510000, China
3 Department of Mechanical & Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China
4 State Key Laboratory for Mechanical Behavior of Materials, Shaanxi International Research Center for Soft Matter, School of Materials Science and Engineering, Xi’an Jiaotong University, Xi'an 710049, China
5 The Hong Kong University of Science and Technology Shenzhen Research Institute, Shenzhen 518057, China
Revised: 24 October 2022
Accepted: 5 December 2022
The strength σy(D) of a polycrystal can decrease or increase with the grain diameter D, i.e., the famous Hall-Petch (HP) and inverse-Hall-Petch (IHP) behaviors, respectively. However, σy(D) under thick grain boundaries (GBs) (i.e., GB thickness l gt;1 particle) and σy(l) have rarely been explored. Here we measure them by systematically varying D and l of two-dimensional glass-crystal composites in simulations. We demonstrate that increasing l and decreasing D have similar effects on reducing dislocation motions and promoting GB deformations. Consequently, the classical HP-IHP behaviors of σy(D,l=1) and our generalized HP-IHP behaviors of σy(D, l) share similar mechanisms and can be unified as σy (AGB/Atot), where AGB/Atot is the fraction of the amorphous region. The results reveal a way to exceed the maximum strength of normal polycrystals. The generalized HP-IHP behaviors of σy(D, l) should be similar in 2D and 3D, except that the HP effect in 3D is stronger.
Key words: polycrystal / amorphous solid / crystal-glass crossover / Hall-Petch strengthening / inverse Hall-Petch weakening
© The Author(s) 2023. Published by Science Press and EDP Sciences
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