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Effect of stress-states on non-classical twinning in three-point bending of magnesium alloys

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Title: Effect of stress-states on non-classical twinning in three-point bending of magnesium alloys
Authors: Paramatmuni, C
Dunne, FPE
Item Type: Journal Article
Abstract: The influence of stress state on the drivers of non-classical twin nucleation in three-point bending of Magnesium alloy AZ31 is presented in this study. Deformed microstructures and textures at the tensile and, for the first time, shear regions are investigated in detail. The experimental observations coupled with the strain-gradient crystal plasticity analyses show that the shear nucleates more twins compared to the tensile and compressive stress-states at near yield-point. Stored energy density provides mechanistic insight into the local drivers of non-classical twin nucleation observed in the shear stress-state region. Further, the twin variant selection follows the locally stored shear energy density criterion, as opposed to the twin resolved shear stress, indicating that their nucleation is driven by local energy and defect sources.
Issue Date: 15-Nov-2023
Date of Acceptance: 24-Jun-2023
URI: http://hdl.handle.net/10044/1/111928
DOI: 10.1016/j.ijmecsci.2023.108574
ISSN: 0020-7403
Publisher: Elsevier
Journal / Book Title: International Journal of Mechanical Sciences
Volume: 258
Copyright Statement: Copyright © Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/
Publication Status: Published
Article Number: 108574
Online Publication Date: 2023-06-26
Appears in Collections:Materials



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