Eutectic intermetallic formation during solidification of a Mg-Sn-Al-Zn-Mn alloy
File(s)
Accepted version
Author(s)
Type
Journal Article
Abstract
Multiple primary and eutectic intermetallic compounds (IMCs) often form during the solidification of multicomponent magnesium alloys. Here, we comprehensively explore eutectic intermetallic formation in Mg-4Sn-3Al-1.5Zn-0.6Mn (wt%) as-cast alloy, in comparison with Mg-3Al-1Zn-0.3Mn, to better understand Mg2Sn formation during complex multiphase solidification and how it affects the formation of other IMCs. Various IMCs formed at different stages of solidification: τ-AlMn and Al8Mn5 early during solidification and Mg2Sn, β-Mg17Al12, and τ-MgAlZn as late forming eutectic phases. Most Mg2Sn phase shared a faceted interface with β-Mg17Al12 and τ-MgAlZn grains, forming a fully divorced eutectic particle containing multiple phases. EBSD-based trace analysis in combination with XCT and TEM results revealed that β-Mg17Al12 and τ-MgAlZn phase grew adjacent to the {100} growth facets of Mg2Sn. Within multi-phase particles, seven types of reproducible orientation relationships (ORs) were measured between each intermetallic. The ORs between Mg2Sn and τ-MgAlZn were found to have the best lattice match among the observed phase pairs. For the defined ORs, Mg2Sn can be correlated with the icosahedral coordination in τ-MgAlZn.
Date Issued
2022-04
Date Acceptance
2022-02-14
Citation
Materials Characterization, 2022, 186, pp.1-15
ISSN
1044-5803
Publisher
Elsevier BV
Start Page
1
End Page
15
Journal / Book Title
Materials Characterization
Volume
186
Copyright Statement
© 2022 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
https://www.sciencedirect.com/science/article/pii/S1044580322000894?via%3Dihub
Subjects
Materials
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status
Published
Article Number
111807
Date Publish Online
2022-02-18