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In situ observations of the rapid solidification for undercooled Al30Si70 alloy melt

Published online by Cambridge University Press:  13 January 2016

Junfeng Xu ,
Long Diao ,
Junhui Yan ,
Bo Dang ,
Man Zhu ,
Fange Chang  and
Zengyun Jian
Junfeng Xu*
Affiliation:
The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi 710021, People's Republic of China
Long Diao
Affiliation:
The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi 710021, People's Republic of China
Junhui Yan
Affiliation:
The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi 710021, People's Republic of China
Bo Dang
Affiliation:
The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi 710021, People's Republic of China
Man Zhu
Affiliation:
The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi 710021, People's Republic of China
Fange Chang
Affiliation:
The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi 710021, People's Republic of China
Zengyun Jian*
Affiliation:
The Shaanxi Key Laboratory of Photoelectric Functional Materials and Devices, Xi'an Technological University, Xi'an, Shaanxi 710021, People's Republic of China
*
a) Address all correspondence to this author. e-mail: jianzengyun@yahoo.com
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Abstract

Rapid solidification of Al30Si70 alloy was studied via electromagnetic levitation technique. The solidification kinetics and the morphology of the solidification front of the Si phase were analyzed in situ by using a high-speed video camera and subsequent microstructural analysis of as-solidified samples. It shows that solidification of the sample always starts from one point. After that, nucleation continues to proceed at the interface front during growth. The morphology of primary Si transforms from faceted wafer to nonfaceted equiaxed grain and the grain size decreases with increase of undercooling. At small undercooling, the growth velocity of primary Si decreases with time and the floated Si wafers have a trend to agglomerate, while at large undercooling, the nucleation rate decreases with time, which are explained by the fact that silicon content, undercooling and density at the solid–liquid interface change with time in solidification. Finally, the nucleation rate and growth velocity were discussed in combination of classical theory.

Keywords

rapid solidificationSiscanning electron microscopy (SEM)
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 2 , 28 January 2016 , pp. 222 - 231
Copyright
Copyright © Materials Research Society 2016 

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References

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