| The transformation of edge dislocation dipoles in aluminium | |
| H. Wang; D. S. Xu; R. Yang; P. Veyssiere | |
| 2008 | |
| Source Publication | Acta Materialia
 |
| ISSN | 1359-6454 |
| Volume | 56Issue:17Pages:4608-4620 |
| Abstract | The transformations of dipoles of dissociated edge dislocations in aluminium are investigated using molecular dynamics for dipole heights ranging from one to ten {111} interplanar distances and at temperatures up to 900 K. Three types of configurations, hollow, vertical compact and inclined dipoles, are considered and their relative stabilities compared. Hollows are unstable at finite temperature. Dipoles neither annihilate nor form stable hollow cores but transform into height- and temperature-dependent layouts including cores containing ordered free Volumes, zigzag faulted dipoles and agglormerated truncated stacking fault tetrahedra (SFT). Small individual SFT are formed at the highest temperatures, attesting to short-range pipe diffusion. These rearranged configurations are strong obstacles to mobile dislocations, thence potential nucleation sites for dislocation entanglement and self-patterning under single slip. A new thermally activated mechanism of SFT formation directly from vacancy clusters resulting from local dipole pinching-off is reported. (C) 2008 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. |
| description.department | [wang, h.; xu, d. s.; yang, r.] chinese acad sci, inst met res, shenyang 110016, peoples r china. [veyssiere, p.] off natl etud & rech aerosp, cnrs, lem, f-92322 chatillon, france.;xu, ds (reprint author), chinese acad sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china;dsxu@imr.ac.cn |
| Keyword | Dislocation Dipole Annihilation Stacking Fault Tetrahedron Molecular Dynamics Simulations Reordering Stacking-fault Tetrahedra Nickel Single-crystals Molecular-dynamics Fcc Metals Dissociated Dislocations Interatomic Potentials Room-temperature Weak-beam Slip Al |
| URL | 查看原文 |
| WOS ID | WOS:000260372100008 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/33126 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | H. Wang,D. S. Xu,R. Yang,et al. The transformation of edge dislocation dipoles in aluminium[J]. Acta Materialia,2008,56(17):4608-4620. |
| APA | H. Wang,D. S. Xu,R. Yang,&P. Veyssiere.(2008).The transformation of edge dislocation dipoles in aluminium.Acta Materialia,56(17),4608-4620. |
| MLA | H. Wang,et al."The transformation of edge dislocation dipoles in aluminium".Acta Materialia 56.17(2008):4608-4620. |
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