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Solidification Behavior and Microstructure of Al-7Si Alloys with Individual and Combined Additions of Sr and Yb
Joint Authors
Dong, Zhou
Hu, Zhi
Xie, Hecong
Li, Xiao
Yan, Hong
Source
Advances in Materials Science and Engineering
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-02-03
Country of Publication
Egypt
No. of Pages
10
Abstract EN
The effects of individual and combined additions of Sr and Yb on the solidification behavior and microstructure of Al-7Si alloys were investigated using thermal analysis, optical microscopy, and scanning electron microscopy.
The results showed that the nucleation temperature, minimum temperature, and growth temperature of eutectic solidification were lower than those of the unmodified alloys, and eutectic recalescence at 2°C in the Yb- and (Sr + Yb)-modified alloys was observed.
The decrease in the nucleation temperature and an increase in recalescence obviously refined the eutectic Si morphology of the Sr-, Yb-, and (Sr + Yb)-modified alloys from a coarse plate-like structure to a fine fibrous structure.
Moreover, the three-dimensional microstructure of eutectic Si in the (Sr + Yb)-modified alloy showed the finer fibrous structure, which was mainly attributed to formation of the Al2Si2Yb phase.
The formation enthalpy of Al2Si2Yb was lower than that of Al-(Si)-Sr in the (Sr + Yb)-modified alloy, thus suppressing the formation of the Al2Si2Sr intermetallic compound.
The more effective Sr together with Yb further improved the modification effect of eutectic silicon.
American Psychological Association (APA)
Dong, Zhou& Hu, Zhi& Yan, Hong& Xie, Hecong& Li, Xiao. 2019. Solidification Behavior and Microstructure of Al-7Si Alloys with Individual and Combined Additions of Sr and Yb. Advances in Materials Science and Engineering،Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1121438
Modern Language Association (MLA)
Dong, Zhou…[et al.]. Solidification Behavior and Microstructure of Al-7Si Alloys with Individual and Combined Additions of Sr and Yb. Advances in Materials Science and Engineering No. 2019 (2019), pp.1-10.
https://search.emarefa.net/detail/BIM-1121438
American Medical Association (AMA)
Dong, Zhou& Hu, Zhi& Yan, Hong& Xie, Hecong& Li, Xiao. Solidification Behavior and Microstructure of Al-7Si Alloys with Individual and Combined Additions of Sr and Yb. Advances in Materials Science and Engineering. 2019. Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1121438
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1121438