On grain coarsening and refining of the Mg-3Al alloy by Sm

Hu, Xiaoyu, Fu, Penghuai, St John, David, Peng, Liming, Sun, Ming and Zhang, Mingxing (2016) On grain coarsening and refining of the Mg-3Al alloy by Sm. Journal of Alloys and Compounds, 663 387-394. doi:10.1016/j.jallcom.2015.11.193

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Author Hu, Xiaoyu
Fu, Penghuai
St John, David
Peng, Liming
Sun, Ming
Zhang, Mingxing
Title On grain coarsening and refining of the Mg-3Al alloy by Sm
Journal name Journal of Alloys and Compounds   Check publisher's open access policy
ISSN 0925-8388
1873-4669
Publication date 2016-04-05
Year available 2015
Sub-type Article (original research)
DOI 10.1016/j.jallcom.2015.11.193
Open Access Status File (Author Post-print)
Volume 663
Start page 387
End page 394
Total pages 8
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Subject 2211 Mechanics of Materials
2210 Mechanical Engineering
2506 Metals and Alloys
2505 Materials Chemistry
Abstract The effect of Sm on the microstructure of a Mg-3Al alloy has been investigated where it was found that the size of the primary alpha-Mg grains was significantly coarsened by the addition of 0.7 wt. % Sm, but dramatically refined by 2.1 wt. % Sm. It is proposed that the coarsening effect of Sm is due to a decrease in the nucleation potency of the native Al-Fe-C-O particles when they transform to the lower potency Al-Fe-Sm-C-O particles. The grain refinement observed when 2.1 wt. % Sm is added, is caused by the formation of potent Al2Sm nucleant particles prior to the solidification of alpha-Mg. The "Interdependence Theory" was then applied to describe the nucleant selection process in the Mg-3Al-2.1Sm alloy. (C) 2015 Elsevier B.V. All rights reserved.
Formatted abstract
The effect of Sm on the microstructure of a Mg–3Al alloy has been investigated where it was found that the size of the primary α-Mg grains was significantly coarsened by the addition of 0.7 wt. % Sm, but dramatically refined by 2.1 wt. % Sm. It is proposed that the coarsening effect of Sm is due to a decrease in the nucleation potency of the native Al–Fe–C–O particles when they transform to the lower potency Al–Fe–Sm–C–O particles. The grain refinement observed when 2.1 wt. % Sm is added, is caused by the formation of potent Al2Sm nucleant particles prior to the solidification of α-Mg. The “Interdependence Theory” was then applied to describe the nucleant selection process in the Mg–3Al–2.1Sm alloy.
Keyword Metals and alloys
Nucleation
Rare earth compounds
Solidification
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 51201103
DP120101672
13X100030018
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2016 Collection
 
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