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Faceted–nonfaceted growth transition and 3-D morphological evolution of primary Al6Mn microcrystals in directionally solidified Al–3 at.% Mn alloy

Published online by Cambridge University Press:  09 June 2014

Huijun Kang ,
Tongmin Wang ,
Xinzhong Li ,
Yanqing Su ,
Jingjie Guo  and
Hengzhi Fu
Huijun Kang
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Tongmin Wang*
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China
Xinzhong Li
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Yanqing Su
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Jingjie Guo
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Hengzhi Fu
Affiliation:
Department of Materials Engineering, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
*
a) Address all correspondence to this author. e-mail: tmwang@dlut.edu.cn
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Abstract

A comprehensive understanding of the growth pattern of intermetallic compounds (IMCs) during solidification is critical to both the crystal-growth theory and its property optimization. In this article, growth pattern and three-dimensional (3D) morphology of primary Al6Mn IMC were investigated in directionally solidified Al–3 at.% Mn alloy at a wide range of growth rates. A transition from faceted (<60 μm/s) to nonfaceted growth (>100 μm/s) was observed with increasing growth rates. Correspondingly, 3D morphologies of primary Al6Mn change from a solid polyhedron to a hollow structure, and then to a dendrite. This kind of change is associated with the competitive growths of different crystal planes determined by the crystallographic anisotropy and growth kinetics of Al6Mn. A growth model based on atomic cluster attachment is proposed to reveal the growth transition, and a growth-rate ratio between different crystal planes is used to appropriately reveal the formation mechanism of different morphologies at low rates.

Keywords

aluminum alloyintermetallics compoundsdirectional solidificationgrowth pattern3D morphology

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Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 11 , 14 June 2014 , pp. 1256 - 1263
Copyright
Copyright © Materials Research Society 2014 

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