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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: [email protected]
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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
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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