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Controllable 3D morphology and growth mechanism of quasicrystalline phase in directionally solidified Al–Mn–Be alloy

Published online by Cambridge University Press:  15 October 2014

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

Three-dimensional (3D) morphological evolution and growth mechanisms of primary I-phase particles have been investigated in directionally solidified Al–6Mn–2.5Be (wt%) alloy at a wide range of growth rates (100–1500 μm/s). At relatively low growth rates (100–600 μm/s), the I-phase particles exhibit faceted growth with strong anisotropy, forming a hierarchical flower-like aggregate with icosahedral morphological symmetry composed of several attached irregular polyhedrons or pentagonal dodecahedrons. At higher growth rates (e.g., 1000 μm/s), the interface of the I-phases becomes unstable along the edges and corners of the pentagonal dodecahedron, thereby arousing growth perturbations. Correspondingly, a transition from faceted to nonfaceted growth occurs with increasing growth rate. Further increase of the growth rate leads to the formation of I-phase columnar dendrites' preferential growth along the 3-fold axis. The configurations of the flower-like aggregates can be adequately illustrated by a geometrical model in terms of the perfect and elongated pentagonal dodecahedrons. A growth mechanism for the flower-like aggregates has been proposed based on the clear understanding of the 3D morphological evolution of the I-phase particles.

Keywords

Al–Mn–Be alloysquasicrystaldirectional solidification3D morphologycrystal growth
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 21 , 14 November 2014 , pp. 2547 - 2555
Copyright
Copyright © Materials Research Society 2014 

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