| Atomistic simulation for configuration evolution and energetic calculation of crack in body-centered-cubic iron |
| L. X. Cao; C. Y. Wang
|
| 2006
|
| 发表期刊 | Journal of Materials Research
 |
| ISSN | 0884-2914
|
| 卷号 | 21期号:10页码:2542-2549 |
| 摘要 | The molecular dynamics method has been used to simulate mode I cracking in body-centered-cubic iron. Close attention has been paid to the process of the atomic configuration evolution of the cracks. The simulation shows that at low temperatures, partial dislocations are emitted before the initiation of crack propagation, subsequently forming the stacking faults or multilayer twins on {112} planes, and then brittle cleavage and extended dislocation nucleation are observed at the crack tip accompanied by twin extension. These results are in agreement with the experimental observation that twinning and fracture processes cooperate at low temperatures. Furthermore, an energetics analysis has been made on the deformation behavior observed at the crack tip. The effect of temperature on the fracture process is discussed. At the higher temperature, plastic deformation becomes easier, and crack blunting occurs. With increasing temperature, the fracture resistance increases, and the effect of the lattice trapping can be weakened by thermal activation. |
| 部门归属 | cent iron & steel res inst, beijing 100081, peoples r china. acad sinica, int ctr mat phys, shenyang 110016, peoples r china. tsing hua univ, dept phys, beijing 100084, peoples r china.;cao, lx (reprint author), cent iron & steel res inst, beijing 100081, peoples r china;cao_lx@sohu.com
|
| 关键词 | Molecular-dynamics Simulation
To-ductile Transition
Dislocation
Emission
Alpha-iron
Activation-energy
Single-crystals
Fracture
Tip
Deformation
Cleavage
|
| URL | 查看原文
|
| WOS记录号 | WOS:000241021600014
|
| 引用统计 |
|
| 文献类型 | 期刊论文
|
| 条目标识符 | http://ir.imr.ac.cn/handle/321006/34135
|
| 专题 | 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. Atomistic simulation for configuration evolution and energetic calculation of crack in body-centered-cubic iron[J]. Journal of Materials Research,2006,21(10):2542-2549.
|
| APA |
L. X. Cao,&C. Y. Wang.(2006).Atomistic simulation for configuration evolution and energetic calculation of crack in body-centered-cubic iron.Journal of Materials Research,21(10),2542-2549.
|
| MLA |
L. X. Cao,et al."Atomistic simulation for configuration evolution and energetic calculation of crack in body-centered-cubic iron".Journal of Materials Research 21.10(2006):2542-2549.
|
修改评论