Investigation on the icosahedral quasicrystal phase in Mg70.8Zn28Nd1.2 alloy
来源期刊：JOURNAL OF RARE EARTHS2009年第2期
论文作者：ZHOU Cuilan LIANG Wei HAN Fuyin XU Chunxiang YAN Jie ZHANG Jinshan
Key words：Mg-Zn-Nd; icosahedral quasicrystal phase; microstructure; growth morphology; adsorption; rare earths;
Abstract: Mg70.8Zn28Nd1.2 (mole fraction) alloy containing icosahedral quasicrystal phase (I-phase) was prepared under conventional metal casting conditions. The microstructure, phase constitution and phase structure of the alloy were investigated by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS) and transmission electron microscopy (TEM). The re-sults showed that the spherical phase in MgT70.8Zn28Nd1.2 alloy was a simple icosahedral quasicrystal with stoichiometric composition of Mg40Zn55Nd5 and quasi-lattice of 0.525 nm. In this research, the as-cast microstructure of Mg70.8Zn28Nd1.2 alloy mainly consisted of Mg40Zn55Nd5 icosahedral quasicrystal phase and Mg7Zn3 columnar crystal matrix. In the growing process of Mg40Zn55Nd5 icosahedral qua-sicrystal phase, the growth morphology mainly depended on interface energy, adsorption effect of Nd and cooling rate.
ZHOU Cuilan1，LIANG Wei1，HAN Fuyin1，XU Chunxiang1，YAN Jie1，ZHANG Jinshan1
(1.College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
Abstract:Mg70.8Zn28Nd1.2 (mole fraction) alloy containing icosahedral quasicrystal phase (I-phase) was prepared under conventional metal casting conditions. The microstructure, phase constitution and phase structure of the alloy were investigated by means of scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometer (EDS) and transmission electron microscopy (TEM). The re-sults showed that the spherical phase in MgT70.8Zn28Nd1.2 alloy was a simple icosahedral quasicrystal with stoichiometric composition of Mg40Zn55Nd5 and quasi-lattice of 0.525 nm. In this research, the as-cast microstructure of Mg70.8Zn28Nd1.2 alloy mainly consisted of Mg40Zn55Nd5 icosahedral quasicrystal phase and Mg7Zn3 columnar crystal matrix. In the growing process of Mg40Zn55Nd5 icosahedral qua-sicrystal phase, the growth morphology mainly depended on interface energy, adsorption effect of Nd and cooling rate.
Key words:Mg-Zn-Nd; icosahedral quasicrystal phase; microstructure; growth morphology; adsorption; rare earths;
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