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A lateral remelting phenomenon of the primary phase below the temperature of peritectic reaction in directionally solidified Cu–Ge alloys

Published online by Cambridge University Press:  20 November 2013

Shujie Wang ,
Liangshun Luo ,
Yanqing Su ,
Jingjie Guo  and
Hengzhi Fu
Shujie Wang
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Liangshun Luo
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Yanqing Su*
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Jingjie Guo
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, People's Republic of China
Hengzhi Fu
Affiliation:
National Key Laboratory for Precision Hot Processing of Metals, 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: suyq@hit.edu.cn
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Abstract

During peritectic solidification, besides the longitudinal remelting of the primary phase at the temperature of peritectic reaction $\left( {T_{\rm{p}}^K} \right)$, a lateral remelting phenomenon of the primary phase below $T_{\rm{p}}^K$ is observed under high velocity in directionally solidified Cu–Ge alloys. The lateral remelting occurs continuously along a liquid channel as temperature decreases, and the lateral remelting velocity is larger than that of peritectic transformation. The lateral remelting leads to the morphological change of the primary dendrites, even the fragmentation of dendrite arms. The phenomenon also means that the classical theory calculating the volume fraction of the primary phase during peritectic transformation can need to be modified under some conditions. However, under low velocity, the phenomenon is not so significant. The phenomenon is explained by means of solidification and remelting theory.

Keywords

directional solidificationcrystal growthmicrostructure
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 23 , 14 December 2013 , pp. 3261 - 3269
Copyright
Copyright © Materials Research Society 2013 

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References

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