Discontinuous precipitation in Mg-Al alloy studied in 3-dimensions

Joseph Robson; Matthew Lawson; Jack Donoghue; Jiaxuan Guo; Alec Davis

doi:10.1016/j.scriptamat.2022.115265

Discontinuous precipitation in Mg-Al alloy studied in 3-dimensions

Joseph Robson, Matthew Lawson, Jack Donoghue, Jiaxuan Guo, Alec Davis

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Abstract

Discontinuous precipitation (DP) is a commonly observed mechanism by which solid solutions decompose. It results from layers of precipitate and solute depleted matrix forming across a moving boundary. The morphology of the discontinuous regions can be highly complex, and the way dislocations or twins navigate such a structure during deformation is poorly understood. Only through 3-dimensional (3D) analysis can the true morphology of discontinuous precipitation be revealed. This work presents the first 3D study of DP using a novel PFIB based serial sectioning method. The material studied is AZ80, an industrially important class of Mg-Al-Zn alloy where DP is commonly observed. The structure is revealed to consist of an interconnected network of DP regions within an interconnected matrix. The width of the DP regions show strong local variations. This structure is expected to be readily penetrated by twins and dislocations.

Original language	English
Article number	115265
Journal	Scripta Materialia
Volume	227
Early online date	4 Jan 2023
DOIs	https://doi.org/10.1016/j.scriptamat.2022.115265
Publication status	E-pub ahead of print - 4 Jan 2023

Keywords

Precipitation
Magnesium alloys
3D reconstruction

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10.1016/j.scriptamat.2022.115265Licence: CC BY

1-s2.0-S135964622200759X-mainFinal published version, 1.75 MBLicence: CC BY

https://linkinghub.elsevier.com/retrieve/pii/S135964622200759X

LightForm: Embedding Materials Engineering in Manufacturing with Light Alloys
Prangnell, P., Curioni, M., Haigh, S., Quinta Da Fonseca, J., Robson, J., Shanthraj, P. & Zhou, X.
1/10/17 → 18/10/23
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title = "Discontinuous precipitation in Mg-Al alloy studied in 3-dimensions",

abstract = "Discontinuous precipitation (DP) is a commonly observed mechanism by which solid solutions decompose. It results from layers of precipitate and solute depleted matrix forming across a moving boundary. The morphology of the discontinuous regions can be highly complex, and the way dislocations or twins navigate such a structure during deformation is poorly understood. Only through 3-dimensional (3D) analysis can the true morphology of discontinuous precipitation be revealed. This work presents the first 3D study of DP using a novel PFIB based serial sectioning method. The material studied is AZ80, an industrially important class of Mg-Al-Zn alloy where DP is commonly observed. The structure is revealed to consist of an interconnected network of DP regions within an interconnected matrix. The width of the DP regions show strong local variations. This structure is expected to be readily penetrated by twins and dislocations.",

keywords = "Precipitation, Magnesium alloys, 3D reconstruction",

author = "Joseph Robson and Matthew Lawson and Jack Donoghue and Jiaxuan Guo and Alec Davis",

year = "2023",

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doi = "10.1016/j.scriptamat.2022.115265",

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T1 - Discontinuous precipitation in Mg-Al alloy studied in 3-dimensions

AU - Robson, Joseph

AU - Lawson, Matthew

AU - Donoghue, Jack

AU - Guo, Jiaxuan

AU - Davis, Alec

PY - 2023/1/4

Y1 - 2023/1/4

N2 - Discontinuous precipitation (DP) is a commonly observed mechanism by which solid solutions decompose. It results from layers of precipitate and solute depleted matrix forming across a moving boundary. The morphology of the discontinuous regions can be highly complex, and the way dislocations or twins navigate such a structure during deformation is poorly understood. Only through 3-dimensional (3D) analysis can the true morphology of discontinuous precipitation be revealed. This work presents the first 3D study of DP using a novel PFIB based serial sectioning method. The material studied is AZ80, an industrially important class of Mg-Al-Zn alloy where DP is commonly observed. The structure is revealed to consist of an interconnected network of DP regions within an interconnected matrix. The width of the DP regions show strong local variations. This structure is expected to be readily penetrated by twins and dislocations.

AB - Discontinuous precipitation (DP) is a commonly observed mechanism by which solid solutions decompose. It results from layers of precipitate and solute depleted matrix forming across a moving boundary. The morphology of the discontinuous regions can be highly complex, and the way dislocations or twins navigate such a structure during deformation is poorly understood. Only through 3-dimensional (3D) analysis can the true morphology of discontinuous precipitation be revealed. This work presents the first 3D study of DP using a novel PFIB based serial sectioning method. The material studied is AZ80, an industrially important class of Mg-Al-Zn alloy where DP is commonly observed. The structure is revealed to consist of an interconnected network of DP regions within an interconnected matrix. The width of the DP regions show strong local variations. This structure is expected to be readily penetrated by twins and dislocations.

KW - Precipitation

KW - Magnesium alloys

KW - 3D reconstruction

U2 - 10.1016/j.scriptamat.2022.115265

DO - 10.1016/j.scriptamat.2022.115265

M3 - Article

VL - 227

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

M1 - 115265

ER -

Discontinuous precipitation in Mg-Al alloy studied in 3-dimensions

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Keywords

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