The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron
Nanocrystalline metals have many applications in nanodevices, especially nanoscale electronics in aerospace. Their ability to resist fracture under impact produced by environmental stress is the main concern of nanodevice design. By carrying out molecular dynamics simulations under different fast lo...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-02-01
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| Series: | Nanomaterials |
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| Online Access: | https://www.mdpi.com/2079-4991/14/4/370 |
| _version_ | 1797297330924290048 |
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| author | Zhifu Zhao Zhen Wang Yehui Bie Xiaoming Liu Yueguang Wei |
| author_facet | Zhifu Zhao Zhen Wang Yehui Bie Xiaoming Liu Yueguang Wei |
| author_sort | Zhifu Zhao |
| collection | DOAJ |
| description | Nanocrystalline metals have many applications in nanodevices, especially nanoscale electronics in aerospace. Their ability to resist fracture under impact produced by environmental stress is the main concern of nanodevice design. By carrying out molecular dynamics simulations under different fast loading rates, this work examines the effect of impact load on the fracture behavior of nanocrystalline bcc iron at an atomistic scale. The results show that a crack propagates with intergranular decohesion in nanocrystalline iron. With the increase in impact load, intergranular decohesion weakens, and plastic behaviors are generated by grain boundary activities. Also, the mechanism dominating plastic deformation changes from the atomic slip at the crack tip to obvious grain boundary activities. The grain boundary activities produced by the increase in impact load lead to an increase in the threshold energy for crack cleavage and enhance nanocrystalline bcc iron resistance to fracture. Nanocrystalline bcc iron can keep a high fracture ductility under a large impact load. |
| first_indexed | 2024-03-07T22:19:07Z |
| format | Article |
| id | doaj.art-5dfc1f1997ed41438bdacf57a835a53f |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-07T22:19:07Z |
| publishDate | 2024-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-5dfc1f1997ed41438bdacf57a835a53f2024-02-23T15:29:29ZengMDPI AGNanomaterials2079-49912024-02-0114437010.3390/nano14040370The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc IronZhifu Zhao0Zhen Wang1Yehui Bie2Xiaoming Liu3Yueguang Wei4The State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, ChinaThe State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, ChinaDepartment of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, ChinaThe State Key Laboratory of Nonlinear Mechanics (LNM), Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, ChinaDepartment of Mechanics and Engineering Science, College of Engineering, Peking University, Beijing 100871, ChinaNanocrystalline metals have many applications in nanodevices, especially nanoscale electronics in aerospace. Their ability to resist fracture under impact produced by environmental stress is the main concern of nanodevice design. By carrying out molecular dynamics simulations under different fast loading rates, this work examines the effect of impact load on the fracture behavior of nanocrystalline bcc iron at an atomistic scale. The results show that a crack propagates with intergranular decohesion in nanocrystalline iron. With the increase in impact load, intergranular decohesion weakens, and plastic behaviors are generated by grain boundary activities. Also, the mechanism dominating plastic deformation changes from the atomic slip at the crack tip to obvious grain boundary activities. The grain boundary activities produced by the increase in impact load lead to an increase in the threshold energy for crack cleavage and enhance nanocrystalline bcc iron resistance to fracture. Nanocrystalline bcc iron can keep a high fracture ductility under a large impact load.https://www.mdpi.com/2079-4991/14/4/370molecular dynamics simulationnanocrystalline ironimpact loadfracture resistancefracture ductility |
| spellingShingle | Zhifu Zhao Zhen Wang Yehui Bie Xiaoming Liu Yueguang Wei The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron Nanomaterials molecular dynamics simulation nanocrystalline iron impact load fracture resistance fracture ductility |
| title | The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron |
| title_full | The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron |
| title_fullStr | The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron |
| title_full_unstemmed | The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron |
| title_short | The Effect of Impact Load on the Atomistic Scale Fracture Behavior of Nanocrystalline bcc Iron |
| title_sort | effect of impact load on the atomistic scale fracture behavior of nanocrystalline bcc iron |
| topic | molecular dynamics simulation nanocrystalline iron impact load fracture resistance fracture ductility |
| url | https://www.mdpi.com/2079-4991/14/4/370 |
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