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Molecular dynamic simulation of edge dislocation-void interaction in pure Al and Al-Mg alloy

Bahramyan, M., Taherzadeh Mousavian, Reza orcid logoORCID: 0000-0002-2274-3636 and Brabazon, Dermot orcid logoORCID: 0000-0003-3214-6381 (2016) Molecular dynamic simulation of edge dislocation-void interaction in pure Al and Al-Mg alloy. Materials Science and Engineering: A, 674 . pp. 82-90. ISSN 0921-5093

Abstract
In this study, the interaction of edge dislocations with nano-scale voids was investigated for the face centered cubic (FCC) structure of pure aluminum and Al-Mg alloy. The effect of Mg solute atoms on the Peierls stress (required for dislocation motion) at different temperatures, and the critical resolved shear stress (CRSS) for dislocation-void interaction was investigated in this study. In addition, the influences of void diameter(1, 2 and 3 nm), inter-void distance (7.5 and 15 nm) in a void array, and of temperature ( 300◦K) on resolved shear stress were determined. It was found that substitutional Mg atoms was highly effective on improving the mechanical behavior of the Al lattice and on the type of dislocation-void interaction (simultaneous or separate passing of partial dislocations). In addition, it was obtained that no void-induced climbing occurred during the interactions for these systems. Higher void diameter and in particular lower inter-void spacing led to a considerable increase in the CRSS, while the latter changed the type of dislocation-void interaction. Finally, it was shown that Peierls stress was decreased for pure aluminum from 0◦K to 10◦K, while different results were obtained for Al-Mg alloy that were discussed in detail
Metadata
Item Type:Article (Published)
Refereed:Yes
Uncontrolled Keywords:Aluminum-Magnesium alloy; Atomistic simulation; Dislocation
Subjects:Engineering > Mechanical engineering
DCU Faculties and Centres:Research Initiatives and Centres > Advanced Processing Technology Research Centre (APTRC)
DCU Faculties and Schools > Faculty of Engineering and Computing > School of Mechanical and Manufacturing Engineering
Publisher:Elsevier
Official URL:https://doi.org/10.1016/j.msea.2016.07.121
Copyright Information:© 2016 Elservier
Use License:This item is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 3.0 License. View License
ID Code:22298
Deposited On:28 Mar 2018 15:37 by Thomas Murtagh . Last Modified 24 Jun 2021 15:40
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