Growth twinning and morphology of Al45Cr7 and Al13Fe4
File(s)
Accepted version
Author(s)
Cui, Yi
Gourlay, Christopher
Type
Journal Article
Abstract
Twinned crystal growth is studied in primary Al45Cr7 and Al13Fe4 intermetallic compounds (IMCs) to explore how different twin types and twin variants affect the growth morphology during solidification. In both IMCs, the number of twin variants increased as the cooling rate increased and, by ~ 5 K/s, both IMCs formed cyclic twins with combined icosahedral (Al45Cr7) or decagonal (Al13Fe4) pseudosymmetry. The growth morphology depended on which twin variants were present. When all twin domains shared a common direction that was a rod growth direction in single crystals, twinning did not prevent crystals from growing as rods. This was the case for both IMCs at slow cooling rate and Al13Fe4 at all cooling rates. Cyclic twinning of Al13Fe4 generated many re-entrant corners but resulted in only a modest reduction in rod aspect ratio. In contrast, when twin domains in Al45Cr7 had common directions along multiple pseudo-i(2) axes, crystal growth transitioned from rod-like to a near-equiaxed morphology.
Date Issued
2022-02-10
Date Acceptance
2021-10-09
Citation
Journal of Alloys and Compounds, 2022, 893, pp.1-14
ISSN
0925-8388
Publisher
Elsevier
Start Page
1
End Page
14
Journal / Book Title
Journal of Alloys and Compounds
Volume
893
Copyright Statement
© 2021 Elsevier B.V. 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/abs/pii/S0925838821037282?via%3Dihub
Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Physical
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Chemistry
Materials Science
Intermetallic compounds (IMCs)
EBSD
Aluminium alloys
Solidification
X-RAY RADIOGRAPHY
AL-FE
MECHANICAL-PROPERTIES
INTERMETALLIC PHASES
BETA-AL5FESI PHASE
MULTIPLE TWINS
QUASI-CRYSTALS
TENFOLD TWINS
CR
SI
Materials
0204 Condensed Matter Physics
0912 Materials Engineering
0914 Resources Engineering and Extractive Metallurgy
Publication Status
Published
Article Number
ARTN 162318
Date Publish Online
2021-10-14