Investigation on the icosahedral quasicrystal phase in Mg_70.8Zn₂₈Nd_1.2 alloy

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• 作者：Jinshan ZHANG ; Jie YAN ; Fuyin HAN ; Wei LIANG ; Chunxiang XU ; Cuilan ZHOU
• 关键词：Mg-Zn-Nd ; icosahedral quasicrystal phase ; microstructure ; growth morphology ; adsorption ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2009
• 出版时间：April 2009
• 年：2009
• 卷：27
• 期：2
• 页码：264-269
• 全文大小：1326 K

文摘

Mg_70.8Zn₂₈Nd_1.2 (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 results showed that the spherical phase in Mg_70.8Zn₂₈Nd_1.2 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 Mg_70.8Zn₂₈Nd_1.2 alloy mainly consisted of Mg₄₀Zn₅₅Nd₅ icosahedral quasicrystal phase and Mg₇Zn₃ columnar crystal matrix. In the growing process of Mg₄₀Zn₅₅Nd₅ icosahedral quasicrystal phase, the growth morphology mainly depended on interface energy, adsorption effect of Nd and cooling rate.