Triple and double twin interfaces in magnesium - the role of disconnections and facets
Triple and double twin interfaces in magnesium - the role of disconnections and facets
Twin boundaries have been shown to deviate from the twinning planes in hcp metals, and facets have often been observed in twin interfaces. This study presents a twinning disconnection-based model for faceting in single, double and triple twin boundaries in magnesium. Primary twinning disconnections predicted via symmetry arguments are shown to produce commensurate facets in single twin boundaries, which are then transformed into commensurate facets in double twin boundaries via the action of secondary twinning disconnections. In contrast, it is shown that for triple twin boundaries with tension-compression-tension twinning sequence, no commensurate facets can be produced by the action of tertiary twinning disconnections. The effect of facets on the macroscopic orientation of twin interfaces is discussed. Theoretical findings are validated by a transmission electron microscopy study of a hot rolled Mg-1.18wt%Al-1.77wt%Nd alloy. Single and double twins are observed, as well as rare triple twins, and the interface between the matrix and a triple twin is captured for the first time. Facets consistent with theoretical predictions are imaged via high-resolution TEM and macroscopic deviations of the boundaries from the primary twinning planes are measured.
Ruffino, Martina
0732cea2-1c05-4bf4-92ba-c2861cfaee75
Nutter, John
bfeb97ea-8696-4dcf-8a34-c980332d2d65
Zeng, Xun
ff832409-a044-4a72-af7a-2c89874387f3
Guan, Dikai
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Rainforth, W. Mark
7226983c-4ca1-4f0a-8191-02e3424dc98f
Paxton, Anthony T.
9864c0e2-f925-4d8d-8d61-f3199aa2fc98
8 March 2023
Ruffino, Martina
0732cea2-1c05-4bf4-92ba-c2861cfaee75
Nutter, John
bfeb97ea-8696-4dcf-8a34-c980332d2d65
Zeng, Xun
ff832409-a044-4a72-af7a-2c89874387f3
Guan, Dikai
d20c4acc-342a-43fa-a204-7283f0cc33bf
Rainforth, W. Mark
7226983c-4ca1-4f0a-8191-02e3424dc98f
Paxton, Anthony T.
9864c0e2-f925-4d8d-8d61-f3199aa2fc98
Ruffino, Martina, Nutter, John, Zeng, Xun, Guan, Dikai, Rainforth, W. Mark and Paxton, Anthony T.
(2023)
Triple and double twin interfaces in magnesium - the role of disconnections and facets.
Scientific Reports, 13 (1), [3861].
(doi:10.1038/s41598-023-30880-w).
Abstract
Twin boundaries have been shown to deviate from the twinning planes in hcp metals, and facets have often been observed in twin interfaces. This study presents a twinning disconnection-based model for faceting in single, double and triple twin boundaries in magnesium. Primary twinning disconnections predicted via symmetry arguments are shown to produce commensurate facets in single twin boundaries, which are then transformed into commensurate facets in double twin boundaries via the action of secondary twinning disconnections. In contrast, it is shown that for triple twin boundaries with tension-compression-tension twinning sequence, no commensurate facets can be produced by the action of tertiary twinning disconnections. The effect of facets on the macroscopic orientation of twin interfaces is discussed. Theoretical findings are validated by a transmission electron microscopy study of a hot rolled Mg-1.18wt%Al-1.77wt%Nd alloy. Single and double twins are observed, as well as rare triple twins, and the interface between the matrix and a triple twin is captured for the first time. Facets consistent with theoretical predictions are imaged via high-resolution TEM and macroscopic deviations of the boundaries from the primary twinning planes are measured.
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Twinning_submission
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Accepted/In Press date: 2 March 2023
Published date: 8 March 2023
Additional Information:
Funding Information:
We thank Bob Pond for many enlightening discussions and clarifications. MR is funded by a studentship in the EPSRC Centre for Doctoral Training, CANES, under grant number EP/L015854/1. We are grateful for funding by Luxfer (MEL) Technologies and we thank Dr Matthew Murphy for support. JN, ATP and WMR are funded under the MATLeS UKRI grant EP/V001787/1. DG and XZ are funded under the UKRI MRC Future Leaders Fellowship, grant MR/T019123/1.
Publisher Copyright:
© 2023, The Author(s).
Identifiers
Local EPrints ID: 477802
URI: http://eprints.soton.ac.uk/id/eprint/477802
ISSN: 2045-2322
PURE UUID: b13bd540-2514-4b4d-9b41-427779b440b5
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Date deposited: 14 Jun 2023 16:52
Last modified: 17 Mar 2024 04:17
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Contributors
Author:
Martina Ruffino
Author:
John Nutter
Author:
Xun Zeng
Author:
Dikai Guan
Author:
W. Mark Rainforth
Author:
Anthony T. Paxton
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