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Generalization of the Hall-Petch and inverse Hall-Petch behaviors by tuning amorphous regions in 2D solids
- Source :
- National Science Open, Vol 2 (2023)
- Publication Year :
- 2023
- Publisher :
- Science Press, 2023.
-
Abstract
- The strength $ σ_{y}(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, $ σ_{y}(D)$ under thick grain boundaries (GBs) (i.e., GB thickness $l>1$ particle) and $ σ_{y}(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 $ σ_{y}(D,l=1)$ and our generalized HP-IHP behaviors of $ σ_{y}(D,l)$ share similar mechanisms and can be unified as $ σ_{y}$ ($A_\textrm{GB}/A_\textrm{tot}$), where $A_\textrm{GB}/A_\textrm{tot}$ 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 $ σ_{y}(D,l)$ should be similar in 2D and 3D, except that the HP effect in 3D is stronger.
Details
- Language :
- English
- ISSN :
- 20971168
- Volume :
- 2
- Database :
- Directory of Open Access Journals
- Journal :
- National Science Open
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.b83d98190ba242fb8a25e379dce5398d
- Document Type :
- article
- Full Text :
- https://doi.org/10.1360/nso/20220058