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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    No. 3    June 2007

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Solidification of Mg-28%Zn-2%Y alloy involving icosahedral quasicrystal phase
WAN Di-qing(万迪庆), YANG Gen-cang(杨根仓),
ZHU Man(朱 满), XU Quan(许 泉), ZHOU Yao-he(周尧和)

State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

Abstract:Applying XRD, DTA, SEM and TEM techniques, an investigation on the solidification microstructure and solidification sequence of Mg-rich Mg-28%Zn-2%Y (mole fraction) alloy was carried out. It is found that, α-Mg dendrites, Mg7Zn3 phase and icosahedral quasicrystal phase coexist in the as-solidified alloy, where the icosahedral quasicrystal, whose structure is indentified to be a face-centered type, originates from a peritectic reaction occurring at 416 ℃. The primary phase of this peritectic reaction has the composition of Mg20Zn66Y14, which is coincident with the H phase reported by TSAI as (Zn, Mg)5Y. Furthermore, the single I-phase grain morphology was observed and its growth evolution was also discussed.

 

Key words: Mg-Zn-Y alloy; icosahedral quasicrystal; microstructure; solidification

ISSN 1672-7029
CN 43-1423/U

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