The effects of helium bubbles on the plastic deformation and fracture behavior of crystal/amorphous nanocomposites
Molecular dynamics (MD) simulations were carried out to study the plastic deformation and fracture behavior of nanoscale Cu/CuZr core-shell crystal/amorphous (CA) models and a nanocrystalline (NC) Cu model before and after helium (He) irradiation. The simulation results indicate that, regardless of...
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Elsevier
2025-09-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425020678 |
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| author | Qin Zhou Shuang Zhang Ping Huang Ziqiang Chen Fei Wang |
| author_facet | Qin Zhou Shuang Zhang Ping Huang Ziqiang Chen Fei Wang |
| author_sort | Qin Zhou |
| collection | DOAJ |
| description | Molecular dynamics (MD) simulations were carried out to study the plastic deformation and fracture behavior of nanoscale Cu/CuZr core-shell crystal/amorphous (CA) models and a nanocrystalline (NC) Cu model before and after helium (He) irradiation. The simulation results indicate that, regardless of whether the models are pre-irradiated or irradiated, the CA structure demonstrates superior plasticity and fracture resistance compared to the NC structure. Moreover, the plasticity and fracture behavior of the CA structure exhibit amorphous layer thickness dependents. Analysis of the crack models after irradiation further reveals that models with thicker amorphous layers possess better ability to passivate the crack tip, and the presence of He bubbles does not alter this outcome. As amorphous layer thickness increases, there is a mechanism transition from dislocation-shear transformation zone (STZ) interaction to shear banding controlled process, corresponding to the observed changes in strength, plasticity, and deformation behaviors. Overall, the proposed CA structure shows reduced sensitivity to the expansion of He bubbles and contributes to its higher crack tip passivation ability, providing atomic-scale theoretical support for the development of CA structural materials with better radiation resistance. |
| format | Article |
| id | doaj-art-69fa2dec12e340d096eae78ead83c30f |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-69fa2dec12e340d096eae78ead83c30f2025-08-23T04:48:34ZengElsevierJournal of Materials Research and Technology2238-78542025-09-01382910292110.1016/j.jmrt.2025.08.114The effects of helium bubbles on the plastic deformation and fracture behavior of crystal/amorphous nanocompositesQin Zhou0Shuang Zhang1Ping Huang2Ziqiang Chen3Fei Wang4State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace and Engineering, Xi'an Jiaotong University, Xi'an, 710049, ChinaAdvanced Materials Research Central, Northwest Institute for Non-ferrous Metal Research, Xi'an, 710016, ChinaState Key Laboratory for Mechanical Behavior of Materials, School of Materials Science and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China; Corresponding author.Songshan Lake Materials Laboratory, Dongguan, 523808, ChinaState Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace and Engineering, Xi'an Jiaotong University, Xi'an, 710049, China; Corresponding author.Molecular dynamics (MD) simulations were carried out to study the plastic deformation and fracture behavior of nanoscale Cu/CuZr core-shell crystal/amorphous (CA) models and a nanocrystalline (NC) Cu model before and after helium (He) irradiation. The simulation results indicate that, regardless of whether the models are pre-irradiated or irradiated, the CA structure demonstrates superior plasticity and fracture resistance compared to the NC structure. Moreover, the plasticity and fracture behavior of the CA structure exhibit amorphous layer thickness dependents. Analysis of the crack models after irradiation further reveals that models with thicker amorphous layers possess better ability to passivate the crack tip, and the presence of He bubbles does not alter this outcome. As amorphous layer thickness increases, there is a mechanism transition from dislocation-shear transformation zone (STZ) interaction to shear banding controlled process, corresponding to the observed changes in strength, plasticity, and deformation behaviors. Overall, the proposed CA structure shows reduced sensitivity to the expansion of He bubbles and contributes to its higher crack tip passivation ability, providing atomic-scale theoretical support for the development of CA structural materials with better radiation resistance.http://www.sciencedirect.com/science/article/pii/S2238785425020678Helium bubblesIrradiation effectMolecular dynamics simulationsCrystal/amorphousPlastic deformationFracture behavior |
| spellingShingle | Qin Zhou Shuang Zhang Ping Huang Ziqiang Chen Fei Wang The effects of helium bubbles on the plastic deformation and fracture behavior of crystal/amorphous nanocomposites Journal of Materials Research and Technology Helium bubbles Irradiation effect Molecular dynamics simulations Crystal/amorphous Plastic deformation Fracture behavior |
| title | The effects of helium bubbles on the plastic deformation and fracture behavior of crystal/amorphous nanocomposites |
| title_full | The effects of helium bubbles on the plastic deformation and fracture behavior of crystal/amorphous nanocomposites |
| title_fullStr | The effects of helium bubbles on the plastic deformation and fracture behavior of crystal/amorphous nanocomposites |
| title_full_unstemmed | The effects of helium bubbles on the plastic deformation and fracture behavior of crystal/amorphous nanocomposites |
| title_short | The effects of helium bubbles on the plastic deformation and fracture behavior of crystal/amorphous nanocomposites |
| title_sort | effects of helium bubbles on the plastic deformation and fracture behavior of crystal amorphous nanocomposites |
| topic | Helium bubbles Irradiation effect Molecular dynamics simulations Crystal/amorphous Plastic deformation Fracture behavior |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425020678 |
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