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Secondary dendrite arm migration caused by temperature gradient zone melting in the directionally solidified Sn–40 at.% Mn peritectic alloy

Published online by Cambridge University Press:  12 April 2013

Peng Peng ,
Xinzhong Li ,
Dongmei Liu ,
Yanqing Su ,
Jingjie Guo  and
Hengzhi Fu
Peng Peng
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Xinzhong Li*
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Dongmei Liu
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Yanqing Su
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Jingjie Guo
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
Hengzhi Fu
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: hitlxz@126.com
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Abstract

Sn–40 at.% Mn peritectic alloys were directionally solidified at different growth rates (1–100 μm/s) under a steep temperature gradient (40 K/mm). The migration of secondary dendrite arm was observed in this peritectic alloy in which both the primary phase and the peritectic phase are intermetallic compounds with nil solubility. This migration is caused by coupling remelting/solidification at the hot/cold sides of the liquid pool between two adjacent secondary dendrite arms by temperature gradient zone melting. Its novel feature is that the remelting temperature of primary phase is a little higher than the solidification temperature of peritectic phase. Analytical solutions based on the assumption that the solubility of both primary and peritectic phases are nil have been proposed to describe this migration. It has also been found that the migration of secondary dendrite arm is most obvious at intermediate growth rates under steep temperature gradient in the directionally solidified Sn–40 at.% Mn peritectic alloy.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 9 , 14 May 2013 , pp. 1196 - 1202
Copyright
Copyright © Materials Research Society 2013 

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References

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