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- Publisher Website: 10.1016/j.ijplas.2023.103719
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Article: Defect-induced inhomogeneous atomic environments in complex concentrated alloys
Title | Defect-induced inhomogeneous atomic environments in complex concentrated alloys |
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Authors | |
Keywords | Dynamic strain aging Extended dislocations Heterogeneous atomic environments High entropy alloys Local pinning effects |
Issue Date | 26-Jul-2023 |
Publisher | Elsevier |
Citation | International Journal of Plasticity, 2023, v. 169 How to Cite? |
Abstract | The multiple elements in equal ratios in complex concentrated alloys (CCAs) favor the formation of local atomic environments like segregation or chemical ordering observed in recent experiments. Such special local atomic environments may pin dislocations on the slip plane, resulting in a higher flow stress for the escape of dislocations and hence a dynamic strain aging (DSA) effect in the form of stress drop. Here, Monte Carlo molecular dynamics (MC/MD) simulations are used to elucidate the atomic atmospheres around dislocations and stacking faults in the NiCoCr alloy system and quantitatively determine the stress drop effect. Increased chemical ordering and segregation around stacking faults and dislocation cores are observed, but detailed analysis shows that atomic segregation around stacking faults (Suzuki atmospheres) contributes the most to stress drop, compared with segregation around dislocation cores (Cottrell atmospheres) and enhanced ordering (Fisher) effects. The MD simulated stress drops are in good agreement with theoretically predicted and experimental values. This work fills an important gap in the understanding of the DSA effect in H/MEAs. |
Persistent Identifier | http://hdl.handle.net/10722/344343 |
ISSN | 2023 Impact Factor: 9.4 2023 SCImago Journal Rankings: 2.894 |
DC Field | Value | Language |
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dc.contributor.author | Xia, Yuanhang | - |
dc.contributor.author | Lyu, Shuang | - |
dc.contributor.author | Li, Wei | - |
dc.contributor.author | Chen, Yue | - |
dc.contributor.author | Ngan, Alfonso H.W. | - |
dc.date.accessioned | 2024-07-24T13:50:52Z | - |
dc.date.available | 2024-07-24T13:50:52Z | - |
dc.date.issued | 2023-07-26 | - |
dc.identifier.citation | International Journal of Plasticity, 2023, v. 169 | - |
dc.identifier.issn | 0749-6419 | - |
dc.identifier.uri | http://hdl.handle.net/10722/344343 | - |
dc.description.abstract | The multiple elements in equal ratios in complex concentrated alloys (CCAs) favor the formation of local atomic environments like segregation or chemical ordering observed in recent experiments. Such special local atomic environments may pin dislocations on the slip plane, resulting in a higher flow stress for the escape of dislocations and hence a dynamic strain aging (DSA) effect in the form of stress drop. Here, Monte Carlo molecular dynamics (MC/MD) simulations are used to elucidate the atomic atmospheres around dislocations and stacking faults in the NiCoCr alloy system and quantitatively determine the stress drop effect. Increased chemical ordering and segregation around stacking faults and dislocation cores are observed, but detailed analysis shows that atomic segregation around stacking faults (Suzuki atmospheres) contributes the most to stress drop, compared with segregation around dislocation cores (Cottrell atmospheres) and enhanced ordering (Fisher) effects. The MD simulated stress drops are in good agreement with theoretically predicted and experimental values. This work fills an important gap in the understanding of the DSA effect in H/MEAs. | - |
dc.language | eng | - |
dc.publisher | Elsevier | - |
dc.relation.ispartof | International Journal of Plasticity | - |
dc.subject | Dynamic strain aging | - |
dc.subject | Extended dislocations | - |
dc.subject | Heterogeneous atomic environments | - |
dc.subject | High entropy alloys | - |
dc.subject | Local pinning effects | - |
dc.title | Defect-induced inhomogeneous atomic environments in complex concentrated alloys | - |
dc.type | Article | - |
dc.identifier.doi | 10.1016/j.ijplas.2023.103719 | - |
dc.identifier.scopus | eid_2-s2.0-85166153678 | - |
dc.identifier.volume | 169 | - |
dc.identifier.eissn | 1879-2154 | - |
dc.identifier.issnl | 0749-6419 | - |