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Two-phase separated growth and peritectic reaction during directional solidification of Cu–Ge peritectic alloys

Published online by Cambridge University Press:  24 April 2013

Shujie Wang ,
Liangshun Luo ,
Yanqing Su ,
Fuyu Dong ,
Jingjie Guo  and
Hengzhi Fu
Shujie Wang
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China
Liangshun Luo*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China
Yanqing Su*
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China
Fuyu Dong
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China
Jingjie Guo
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China
Hengzhi Fu
Affiliation:
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 15000, China
*
a)Address all correspondence to this author. e-mail: suyq@hit.edu.cn
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Abstract

During directional solidification of Cu–Ge peritectic alloys, a two-phase separated structure has been observed. With proper growth conditions, the peritectic ζ-Cu5Ge and primary α-Cu phases completely separate and form cylindrical layered structures. It is found that the formation of the separated structure is closely related to double diffusive convection and growth conditions. In the two-phase separated structure, a large trijunction region of peritectic reaction forms around the cylindrical α-Cu phase. During peritectic reaction, the morphological instabilities of ζ-Cu5Ge occur under high pulling velocities and are explained by the constitutional undercooling criterion. A new coupling growth between the ζ-Cu5Ge-phase and the groove of α-Cu phase near the trijunction is observed. Different from peritectic coupling growth, the diffusion coupling is established below the peritectic temperature. This two-phase separated growth process creates new opportunities for the fabrication of functionally layered materials.

Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 10 , 28 May 2013 , pp. 1372 - 1377
Copyright
Copyright © Materials Research Society 2013 

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References

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