3D Morphology and Formation Process of the Icosahedral Quasicrystalline Phase in Rapidly Solidified Al-Mn Alloy

doi:10.1007/s40195-015-0357-y

Abstract

Abstract:

Three-dimensional morphology and formation process of icosahedral quasicrystal phase have been investigated in a melt-spun Al-18Mn alloy (in wt%). Three distinct layers corresponding to varying temperature gradient have been observed on the cross section of the ribbons. 3D morphologies of cellular and dendritic icosahedral phase have been obtained through electro-etching. A model has been proposed to describe the formation process of the icosahedral phase and α-Al during the rapid solidification. The icosahedral phases are primarily precipitated from the melt into fine cellular and dendritic particles, and subsequently engulfed by the α-Al which propagates in a planar morphology.

Key words: Rapid solidification, Microstructure, Icosahedral quasicrystal, Aluminum-manganese alloy

Hui-Jun Kang, Zhong-Lue Hu, Xiao-Xia Gao, Zong-Ning Chen, Yi-Ping Lu, Jin-Chuan Jie, Jing-Jie Guo. 3D Morphology and Formation Process of the Icosahedral Quasicrystalline Phase in Rapidly Solidified Al-Mn Alloy[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(1): 28-31.

Figures/Tables 5

Fig.1 a SEM micrograph of melt-spun ribbon cross section; b magnified image of the square area in a

Fig.2 XRD pattern of a rapidly solidified Al-Mn ribbon

Fig.3 a TEM micrograph of as-spun ribbon showing dendritic I-phase (DI) and cellular I-phase (CI); b magnified image of the square area in a

Fig.4 3D morphologies of cellular a and dendritic b I-phases

Fig.5 Schematic diagram illustrates the solidification of the melt-spun Al-Mn alloy: a before solidification; b during solidification; c after solidification

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