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Primary dendrite distribution in directionally solidified Sn–36 at.% Ni peritectic alloy

Published online by Cambridge University Press:  28 November 2012

Peng Peng ,
Xinzhong Li ,
Yanqing Su ,
Dongmei Liu ,
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
Yanqing Su
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
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

The primary dendrite arm spacing and its distribution at the solid–liquid interface has been examined in directionally solidified Sn–36 at.% Ni peritectic alloys under constant temperature gradient in a range of growth rates (2–200 μm/s). Statistical analysis of the primary dendrite arm spacing on transverse sections has been carried out using the minimum spanning tree and Voronoi polygon. The frequency distribution of the number of nearest neighbors determined by the Voronoi polygon suggested that the arrangement of dendrites at the solid–liquid interface could be visualized as hexagonal tessellation. The primary dendrite arm spacing determined by the conventional area counting method and minimum spanning tree all decreased with increasing growth rate, and a range of primary dendrite spacing was present during solidification. The range first increased with increasing growth rate, but when the growth rate exceeded 20 μm/s, it turned to decrease, which can be attributed to disorder induced by growth rate and interdendritic convection.

Keywords

Sn-Ni alloydirectional solidificationprimary dendrite arm spacingminimal spanning tree

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Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 5 , 14 March 2013 , pp. 740 - 746
Copyright
Copyright © Materials Research Society 2012

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