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| Natura: | Preprint |
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2024
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| Accesso online: | https://arxiv.org/abs/2410.18139 |
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| _version_ | 1866909361604919296 |
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| author | Xu, Zhibin Li, Mengmeng Han, Yilong |
| author_facet | Xu, Zhibin Li, Mengmeng Han, Yilong |
| contents | The strength, $σ_{\rm y}$, of a polycrystal decreases with mean grain diameter $D$ at $D\gtrsim50$ atoms (i.e. Hall-Petch behaviour) and increases at $D\lesssim50$ (i.e. inverse Hall-Petch behaviour). Our simulations generalise $σ_{\rm y}(D)$ to $σ_{\rm y}(D,l)$, where $l$ is the mean thickness of grain boundaries. For various particle compositions, the maximum strength is reached at $(D,l)\simeq(50, 6)$ particles for single-component face-centred-cubic solids and at $(D,l)\simeq(50, 2)$ for bidispersed or body-centred-cubic solids because of the different activation stresses of dislocation motions. The results explain recent alloy experiments and provide a way to exceed the maximum strength of polycrystals. Ductility and elastic moduli are also measured in the broad $(D,l)$ space. The regimes without a strength-ductility trade-off, the maximum ductility and ductile--brittle transitions are identified. These results obtained in $(D,l)$ space are important in solid mechanics and can guide the fabrication of crystalline-amorphous composites with outstanding mechanical properties. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_18139 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Mechanical properties of crystalline-amorphous composites: generalisation of Hall-Petch and inverse Hall-Petch behaviours Xu, Zhibin Li, Mengmeng Han, Yilong Materials Science The strength, $σ_{\rm y}$, of a polycrystal decreases with mean grain diameter $D$ at $D\gtrsim50$ atoms (i.e. Hall-Petch behaviour) and increases at $D\lesssim50$ (i.e. inverse Hall-Petch behaviour). Our simulations generalise $σ_{\rm y}(D)$ to $σ_{\rm y}(D,l)$, where $l$ is the mean thickness of grain boundaries. For various particle compositions, the maximum strength is reached at $(D,l)\simeq(50, 6)$ particles for single-component face-centred-cubic solids and at $(D,l)\simeq(50, 2)$ for bidispersed or body-centred-cubic solids because of the different activation stresses of dislocation motions. The results explain recent alloy experiments and provide a way to exceed the maximum strength of polycrystals. Ductility and elastic moduli are also measured in the broad $(D,l)$ space. The regimes without a strength-ductility trade-off, the maximum ductility and ductile--brittle transitions are identified. These results obtained in $(D,l)$ space are important in solid mechanics and can guide the fabrication of crystalline-amorphous composites with outstanding mechanical properties. |
| title | Mechanical properties of crystalline-amorphous composites: generalisation of Hall-Petch and inverse Hall-Petch behaviours |
| topic | Materials Science |
| url | https://arxiv.org/abs/2410.18139 |