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Growth mechanism of an icosahedral quasicrystal and solute partitioning in a Mg-rich Mg–Zn–Y alloy

Published online by Cambridge University Press:  15 April 2014

Jiwei Geng ,
Xinying Teng ,
Guorong Zhou ,
Degang Zhao  and
Jinfeng Leng
Jiwei Geng
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, People's Republic of China
Xinying Teng*
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, People's Republic of China
Guorong Zhou
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, People's Republic of China
Degang Zhao
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, People's Republic of China
Jinfeng Leng
Affiliation:
School of Materials Science and Engineering, University of Jinan, Jinan 250022, People's Republic of China
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

The growth mechanism of an icosahedral quasicrystal and solute partitioning in a Mg-rich Mg–Zn–Y alloy were investigated. It is found that the preferred growth directions of the icosahedral quasicrystalline phase (I-phase) are along 5-fold axes and the planes perpendicular to the 5-fold axes grow in a facet manner. Due to the local compositional change at the solid/liquid interface, the planar growth is gradually replaced by cellular growth. During the nucleation of the primary I-phase, on a microscale, the distribution of the Y element is changed and concentrated along 5-fold directions in the remaining liquid. If the cooling rate is relatively slow, there will be more Y element in the remaining liquid after the formation of the primary I-phase. It causes that (I-phase + α-Mg) eutectic structures form around the primary I-phase. Almost all the Y element is exhausted after this stage. Especially, under a relatively slow cooling rate, the solute partitioning occurs during the growth process of the primary I-phase, which leads to the microshrinkage cavity and crack defects at the edge of the primary I-phase.

Keywords

Mg–Zn–Y alloymicrostructureicosahedral quasicrystalgrowth mechanismsolute partitioning
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 8 , 28 April 2014 , pp. 942 - 949
Copyright
Copyright © Materials Research Society 2014 

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