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：
National Science Open | 2023年 / 2卷 / 03期
基金：
中国国家自然科学基金; 中央高校基本科研业务费专项资金资助;
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.
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页码：24 / 35
页数：12
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