Lattice weakening by edge dislocation core under tension
文献类型：期刊论文
| 作者 | X. Y. Gu ; D. S. Xu ; H. Wang ; R. Yang |
| 刊名 | Modelling and Simulation in Materials Science and Engineering
 |
| 出版日期 | 2010 |
| 卷号 | 18期号:6 |
| 关键词 | triple junction fracture crystals metals simulations transition dynamics cleavage iridium steels |
| ISSN号 | 0965-0393 |
| 中文摘要 | Molecular dynamics simulations are carried out to investigate the influence of edge dislocations on the lattice strength in iron single crystals under tension perpendicular to the dislocation slip plane. Simulations are performed at different temperatures and with different densities of edge dislocations on the ((1) over bar 01) [111] slip system. It is found that cracks nucleate at dislocation cores in dislocation-containing systems at lower critical stresses compared with a perfect lattice, indicating a weakening caused by edge dislocations. Lattice thermal vibration plays an important role during the tensile deformation, resulting in a monotonic decrease in the yield strength as the temperature increases. There exists a critical temperature above which the lattice transforms from brittle to ductile, where dislocation nucleation and glide are favored instead of crack nucleation, and the critical temperature for the dislocated system is lower than that for the perfect lattice. The present simulation shows that higher dislocation density results in lower fracture strength, suggesting that the accumulation of dislocations during cyclic deformation may be the cause of lower strength under fatigue. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://210.72.142.130/handle/321006/31122]  |
| 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 | X. Y. Gu,D. S. Xu,H. Wang,et al. Lattice weakening by edge dislocation core under tension[J]. Modelling and Simulation in Materials Science and Engineering,2010,18(6). |
| APA | X. Y. Gu,D. S. Xu,H. Wang,&R. Yang.(2010).Lattice weakening by edge dislocation core under tension.Modelling and Simulation in Materials Science and Engineering,18(6). |
| MLA | X. Y. Gu,et al."Lattice weakening by edge dislocation core under tension".Modelling and Simulation in Materials Science and Engineering 18.6(2010). |
入库方式： OAI收割
来源：金属研究所
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