Shock wave attenuation in a high-entropy alloy with pre-existing dislocation network
High entropy alloys (HEAs), with their outstanding mechanical properties, hold promise as potential candidates for next-generation structural applications. However, the in-depth understanding of dynamic deformation mechanisms remains limited due to technological constraints in real-time detection of...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425000055 |
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| author | Hongcai Xie Guoxiang Shen Zhichao Ma Wei Zhang Hongwei Zhao Luquan Ren |
| author_facet | Hongcai Xie Guoxiang Shen Zhichao Ma Wei Zhang Hongwei Zhao Luquan Ren |
| author_sort | Hongcai Xie |
| collection | DOAJ |
| description | High entropy alloys (HEAs), with their outstanding mechanical properties, hold promise as potential candidates for next-generation structural applications. However, the in-depth understanding of dynamic deformation mechanisms remains limited due to technological constraints in real-time detection of microstructural evolution at the atomic level. In present work, non-equilibrium molecular dynamics (NEMD) simulations were performed to study the shock response of FeCoNiCrCu HEAs with pre-existing dislocation network. The presence of initial dislocations was demonstrated to favor shock wave attenuation and stress relaxation in HEAs, which was a consequence of facilitated dislocation nucleation, multiplication, reaction, and accumulation behaviors. Especially, considerable immobile dislocations, Stair-rod and Hirth dislocations, occurred through dislocation reactions, contributing to the strain hardening level. Subsequent dynamic compression experiments demonstrated the dislocation multiplication mechanism in HEA, i.e., a high value of initial dislocation density led to a more efficient dislocation multiplication behavior, which further increased the contribution of dislocation strengthening. These findings provide pivotal insights for designing and developing HEAs with optimized properties under extreme environment. |
| format | Article |
| id | doaj-art-0ab52c4eb98343ea83a67de90c524d27 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-0ab52c4eb98343ea83a67de90c524d272025-01-19T06:26:04ZengElsevierJournal of Materials Research and Technology2238-78542025-01-013428992908Shock wave attenuation in a high-entropy alloy with pre-existing dislocation networkHongcai Xie0Guoxiang Shen1Zhichao Ma2Wei Zhang3Hongwei Zhao4Luquan Ren5School of Mechanical and Aerospace Engineering, Jilin University, Changchun, 130025, ChinaSchool of Mechanical and Aerospace Engineering, Jilin University, Changchun, 130025, ChinaSchool of Mechanical and Aerospace Engineering, Jilin University, Changchun, 130025, China; Key Laboratory of CNC Equipment Reliability Ministry of Education, Jilin University, Changchun, 130025, China; Institute of Structured and Architected Materials, Liaoning Academy of Materials, Shenyang 110167, China; Corresponding author. School of Mechanical and Aerospace Engineering, Jilin University, Changchun, 130025, China.School of Mechanical and Aerospace Engineering, Jilin University, Changchun, 130025, ChinaSchool of Mechanical and Aerospace Engineering, Jilin University, Changchun, 130025, China; Key Laboratory of CNC Equipment Reliability Ministry of Education, Jilin University, Changchun, 130025, China; Institute of Structured and Architected Materials, Liaoning Academy of Materials, Shenyang 110167, ChinaSchool of Mechanical and Aerospace Engineering, Jilin University, Changchun, 130025, China; Key Laboratory of Bionic Engineering Ministry of Education, Jilin University, Changchun, 130025, China; Weihai Institute for Bionics-Jilin University, Weihai, 264400, China; Institute of Structured and Architected Materials, Liaoning Academy of Materials, Shenyang 110167, ChinaHigh entropy alloys (HEAs), with their outstanding mechanical properties, hold promise as potential candidates for next-generation structural applications. However, the in-depth understanding of dynamic deformation mechanisms remains limited due to technological constraints in real-time detection of microstructural evolution at the atomic level. In present work, non-equilibrium molecular dynamics (NEMD) simulations were performed to study the shock response of FeCoNiCrCu HEAs with pre-existing dislocation network. The presence of initial dislocations was demonstrated to favor shock wave attenuation and stress relaxation in HEAs, which was a consequence of facilitated dislocation nucleation, multiplication, reaction, and accumulation behaviors. Especially, considerable immobile dislocations, Stair-rod and Hirth dislocations, occurred through dislocation reactions, contributing to the strain hardening level. Subsequent dynamic compression experiments demonstrated the dislocation multiplication mechanism in HEA, i.e., a high value of initial dislocation density led to a more efficient dislocation multiplication behavior, which further increased the contribution of dislocation strengthening. These findings provide pivotal insights for designing and developing HEAs with optimized properties under extreme environment.http://www.sciencedirect.com/science/article/pii/S2238785425000055Molecular dynamicHigh-entropy alloyShockDislocations |
| spellingShingle | Hongcai Xie Guoxiang Shen Zhichao Ma Wei Zhang Hongwei Zhao Luquan Ren Shock wave attenuation in a high-entropy alloy with pre-existing dislocation network Journal of Materials Research and Technology Molecular dynamic High-entropy alloy Shock Dislocations |
| title | Shock wave attenuation in a high-entropy alloy with pre-existing dislocation network |
| title_full | Shock wave attenuation in a high-entropy alloy with pre-existing dislocation network |
| title_fullStr | Shock wave attenuation in a high-entropy alloy with pre-existing dislocation network |
| title_full_unstemmed | Shock wave attenuation in a high-entropy alloy with pre-existing dislocation network |
| title_short | Shock wave attenuation in a high-entropy alloy with pre-existing dislocation network |
| title_sort | shock wave attenuation in a high entropy alloy with pre existing dislocation network |
| topic | Molecular dynamic High-entropy alloy Shock Dislocations |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425000055 |
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