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AlSi2Sc2 intermetallic formation in Al-7Si-0.3Mg-xSc alloys and their effects on as-cast properties
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Document Title
AlSi2Sc2 intermetallic formation in Al-7Si-0.3Mg-xSc alloys and their effects on as-cast properties
Author
Pandee P, Gourlay CM, Belyakov SA, Patakham U, Zeng G, Limmaneevichitr C
Name from Authors Collection
Affiliations
King Mongkuts University of Technology Thonburi; Imperial College London; National Science & Technology Development Agency - Thailand; National Metal & Materials Technology Center (MTEC)
Type
Article
Source Title
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN
0925-8388
Year
2018
Volume
731
Page
1159-1170
Open Access
Green Submitted
Publisher
ELSEVIER SCIENCE SA
DOI
10.1016/j.jallcom.2017.10.125
Format
Abstract
The influences of 0-0.65 wt% Sc additions on microstructure evolution during solidification, and on as-cast tensile properties and fracture behavior have been investigated in Al-7Si-0.3Mg foundry alloys. The results show that the addition of Sc significantly refines both the primary alpha-Al grain size and the eutectic silicon particle size, and Sc also results in the formation of AlSi2Sc2 in up to two eutectic reactions. The as-cast yield strength was improved by the addition of Sc, however, at high Sc level (0.65 wt%) the ultimate tensile strength decreased, owing to the formation of relatively large AlSi2Sc2 crystals in the Al-AlSi2Sc2 eutectic. The fracture path in the tensile samples is shown to pass through the eutectic AlSi2Sc2 intermetallic and eutectic silicon. The Sc level should not be higher than 0.40 wt% Sc to avoid the deleterious effect of AlSi2Sc2. (C) 2017 Elsevier B.V. All rights reserved.
Funding Sponsor
National Research University Project of Thailand's Office of the Higher Education Commission; King Mongkut's University of Technology Thonburi; UK EPSRC [EP/N007638/1]; EPSRC [EP/M002241/1, EP/N007638/1] Funding Source: UKRI; Engineering and Physical Sciences Research Council [EP/N007638/1, EP/M002241/1] Funding Source: researchfish
License
Copyright
Rights
Elsevier B.V.
Publication Source
WOS