Effect of interstitial < 100 > dislocation loop on expansion of micro-crack in body centered cubic iron investigated by molecular dynamics method
文献类型：期刊论文
| 作者 | Liang Jin-Jie2,3 ; Gao Ning1,3; Li Yu-Hong2
|
| 刊名 | ACTA PHYSICA SINICA
 |
| 出版日期 | 2020-06-05 |
| 卷号 | 69期号:11页码:8 |
| 关键词 | radiation damage micro-crack dislocation loop molecular dynamics simulation |
| ISSN号 | 1000-3290 |
| DOI | 10.7498/aps.69.20200317 |
| 通讯作者 | Li Yu-Hong(liyuhong@lzu.edu.cn) |
| 英文摘要 | The interactions between the energetic particles and atoms in materials would result in the atomic displacements and the associated radiation defects. The interstitial dislocation loop, as one of the primary radiation defects, is formed by the clustering of the supersaturated self-interstitial atoms from the displacement damages in body centered cubic (bcc) iron based materials. The radiation hardening, embrittlement, swelling, creep, etc. are generally related to these loops and their interactions with other defects. In addition, the irradiation would also result in the formation of the micro-cracks from the surface of the materials and also from the interface of grains, precipitates, and gas-bubbles inside the materials, which would result in the irradiation assisted stress corrosion crack (IASCC). Therefore, to understand the interaction between interstitial dislocation loop and micro-crack under the irradiation, is one of key steps to understand the underlying mechanism of IASCC. In this work, the interaction between interstitial dislocation loop and micro-crack is simulated by molecular dynamics method on an atomic scale. The distance, relative position between them and radius of dislocation loop, as the main factors affecting their interactions, are studied to explore the underlying reason for inducing the micro-crack to expand on the slip plane. The simulation results indicate that when the interaction between them dominates the whole process with the distance between them within the critical value, the dislocation network containing the < 100 > and 1/2 < 111 > segments, would interact with the crack tip to inhibit the crack from expanding through the pinning effect. When the size of loop is different, the pining effect would be available only when the interaction between loop core and crack tip dominates with the distance between them within the critical value. All these results provide new understanding for further exploring the IASCC under irradiation. |
| WOS关键词 | RADIATION-DAMAGE ; IRRADIATION ; MICROSTRUCTURE ; HARDNESS ; STRAIN ; IONS |
| 资助项目 | National MCF Energy Research and Development Program of China[2018YFE0308101] ; National Natural Science Foundation of China[11675230] ; National Natural Science Foundation of China[11775102] ; Youth Innovation Promotion Association of Chinese Academy of Sciences |
| WOS研究方向 | Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:000560740100017 |
| 出版者 | CHINESE PHYSICAL SOC |
| 资助机构 | National MCF Energy Research and Development Program of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association of Chinese Academy of Sciences |
| 源URL | [http://119.78.100.186/handle/113462/140160]  |
| 专题 | 中国科学院近代物理研究所 |
| 通讯作者 | Li Yu-Hong |
| 作者单位 | 1.Shandong Univ, Inst Frontier & Interdisciplinary Sci, Qingdao 266237, Peoples R China 2.Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China 3.Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China |
| 推荐引用方式 GB/T 7714 | Liang Jin-Jie,Gao Ning,Li Yu-Hong. Effect of interstitial < 100 > dislocation loop on expansion of micro-crack in body centered cubic iron investigated by molecular dynamics method[J]. ACTA PHYSICA SINICA,2020,69(11):8. |
| APA | Liang Jin-Jie,Gao Ning,&Li Yu-Hong.(2020).Effect of interstitial < 100 > dislocation loop on expansion of micro-crack in body centered cubic iron investigated by molecular dynamics method.ACTA PHYSICA SINICA,69(11),8. |
| MLA | Liang Jin-Jie,et al."Effect of interstitial < 100 > dislocation loop on expansion of micro-crack in body centered cubic iron investigated by molecular dynamics method".ACTA PHYSICA SINICA 69.11(2020):8. |
入库方式： OAI收割
来源：近代物理研究所
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