Generalization of the Hall-Petch and inverse Hall-Petch behaviors by tuning amorphous regions in 2D solids

被引：0

作者：

Zhibin Xu ^{[1
,2
]}

Mengmeng Li ^{[3
]}

Huijun Zhang ^{[4
]}

Yilong Han ^{[1
,5
]}

机构：

[1] Department of Physics, The Hong Kong University of Science and Technology

[2] Function Hub, The Hong Kong University of Science and Technology (Guangzhou)

[3] Department of Mechanical & Aerospace Engineering, The Hong Kong University of Science and Technology

[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

[5] The Hong Kong University of Science and Technology Shenzhen Research Institute

来源：

NationalScienceOpen | 2023年 / 2卷 / 03期

关键词：

D O I：

暂无

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

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 > 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/Atotis 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.

引用

页码：24 / 35

页数：12

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