Phonon spectrum and related thermodynamic properties of microcrack in bcc-Fe
文献类型：期刊论文
| 作者 | L. X. Cao ; C. Y. Wang |
| 刊名 | Chinese Physics
 |
| 出版日期 | 2006 |
| 卷号 | 15期号:9页码:2092-2101 |
| 关键词 | phonons microcrack metals transition-metals dynamic fracture single-crystals stacking-fault iron segregation vibrations states modes |
| ISSN号 | 1009-1963 |
| 中文摘要 | The phonon spectrum and the related thermodynamic properties of microcracks in bcc-Fe are studied with the recursion method by using the Finnis-Sinclair (F-S) N-body potential. The initial configuration of the microcracks is established from an anisotropic linear elastic solution and relaxed to an equilibrium by molecular dynamics method. It is shown that the local vibrational density of states of the atoms near a crack tip is considerably different from the bulk phonon spectrum, which is closely associated with the local stress field around the crack tip; meanwhile, the local vibrational energies of atoms near the crack tip are higher than those of atoms in a perfect crystal. These results imply that the crack tip zone is in a complex stress state and closely related to the structure evolution of cracks. It is also found that the phonon excitation is a kind of local effect induced by microcracks. In addition, the microcrack system has a higher vibrational entropy, which reflects the character of phonon spectrum related to the stress field induced by cracks. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/34136]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | L. X. Cao,C. Y. Wang. Phonon spectrum and related thermodynamic properties of microcrack in bcc-Fe[J]. Chinese Physics,2006,15(9):2092-2101. |
| APA | L. X. Cao,&C. Y. Wang.(2006).Phonon spectrum and related thermodynamic properties of microcrack in bcc-Fe.Chinese Physics,15(9),2092-2101. |
| MLA | L. X. Cao,et al."Phonon spectrum and related thermodynamic properties of microcrack in bcc-Fe".Chinese Physics 15.9(2006):2092-2101. |
入库方式： OAI收割
来源：金属研究所
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