Dislocation flow turbulence simultaneously enhances strength and ductility
Multi-principal element alloys (MPEAs) exhibit outstanding strength attributed to the complex dislocation dynamics as compared to conventional alloys. Here, we develop an atomic-lattice-distortion-dependent discrete dislocation dynamics framework consisted of random field theory and phenomenological dislocation model to investigate the fundamental deformation mechanism underlying massive dislocation motions in body-centered cubic MPEA. Amazingly, the turbulence of dislocation speed is identified in light of strong heterogeneous lattice strain field caused by short-range ordering. Importantly, the vortex from dislocation flow turbulence not only acts as an effective source to initiate dislocation multiplication but also induces the strong local pinning trap to block dislocation movement, thus breaking the strength-ductility trade-off.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2024 |
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| Erschienen: |
2024 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:121 |
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| Enthalten in: |
Proceedings of the National Academy of Sciences of the United States of America - 121(2024), 13 vom: 26. März, Seite e2316912121 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Chen, Yang [VerfasserIn] |
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| Links: |
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| Themen: |
Chemical short-range order |
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| Anmerkungen: |
Date Revised 05.04.2024 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
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| doi: |
10.1073/pnas.2316912121 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM369923324 |
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| 520 | |a Multi-principal element alloys (MPEAs) exhibit outstanding strength attributed to the complex dislocation dynamics as compared to conventional alloys. Here, we develop an atomic-lattice-distortion-dependent discrete dislocation dynamics framework consisted of random field theory and phenomenological dislocation model to investigate the fundamental deformation mechanism underlying massive dislocation motions in body-centered cubic MPEA. Amazingly, the turbulence of dislocation speed is identified in light of strong heterogeneous lattice strain field caused by short-range ordering. Importantly, the vortex from dislocation flow turbulence not only acts as an effective source to initiate dislocation multiplication but also induces the strong local pinning trap to block dislocation movement, thus breaking the strength-ductility trade-off | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a chemical short-range order | |
| 650 | 4 | |a dislocation flow turbulence | |
| 650 | 4 | |a multi-principal element alloy | |
| 650 | 4 | |a strength and ductility | |
| 650 | 4 | |a vortex | |
| 700 | 1 | |a Feng, Hui |e verfasserin |4 aut | |
| 700 | 1 | |a Li, Jia |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Bin |e verfasserin |4 aut | |
| 700 | 1 | |a Jiang, Chao |e verfasserin |4 aut | |
| 700 | 1 | |a Liu, Yong |e verfasserin |4 aut | |
| 700 | 1 | |a Fang, Qihong |e verfasserin |4 aut | |
| 700 | 1 | |a Liaw, Peter K |e verfasserin |4 aut | |
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