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Solidification structure evolution of immiscible Al–Bi–Sn alloys at different cooling rates

Published online by Cambridge University Press:  12 July 2019

Jinchuan Jie ,
Zhilin Zheng ,
Shichao Liu ,
Shipeng Yue  and
Tingju Li
Jinchuan Jie*
Affiliation:
Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Zhilin Zheng
Affiliation:
Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Shichao Liu
Affiliation:
Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Shipeng Yue
Affiliation:
Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province), School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Tingju Li
Affiliation:
Laboratory of Special Processing of Raw Materials, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
*
a)Address all correspondence to this author. e-mail: jiejc@dlut.edu.cn
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Abstract

Under conventional solidification conditions, immiscible alloy melt would undergo large-scale composition segregation after liquid–liquid phase separation, resulting in the loss of properties and application value. In the present study, the ternary immiscible Al70Bi10Sn20 alloy was chosen to study the effect of cooling rate on its resultant microstructure by casting the melt under different cooling conditions. The results indicated that the Al–Bi–Sn alloy with a slow cooling rate exhibits a strong spatial phase separation trend during solidification. However, as the cooling rate increases, the decreasing volume fraction of the segregated Bi–Sn-rich regions indicates the efficient suppression of spatial phase separation. The relatively dispersed distribution of Bi–Sn phase in the Al-rich matrix can be obtained by quenching the melt into water. The influence mechanism of cooling rate on the microstructure of the alloy is also discussed. The present study is beneficial to further tailoring the microstructure of immiscible alloys.

Keywords

immiscible alloysAl–Bi–Snsolidification structurecooling ratephase separation
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 14 , 28 July 2019 , pp. 2563 - 2571
Copyright
Copyright © Materials Research Society 2019 

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