Investigation on the icosahedral quasicrystal phase in Mg_(70.8)Zn_(28)Nd_(1.2) alloy  

作　　者：张金山 严杰 韩富银 梁伟 许春香 周翠兰 

机构地区：[1]College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024,China

出　　处：《Journal of Rare Earths》2009年第2期264-269,共6页稀土学报（英文版）

基　　金：supported by National Natural Science Foundation of China (50571073);Natural Science Foundation of Shanxi Province (2009011028-3,2007011067,20051052);High-School Student Project of Taiyuan City (07010713)

摘　　要：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 resuits showed that the spherical phase in Mg70.8Zn28Nd1.2 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 quasicrystal phase, the growth morphology mainly depended on interface energy, adsorption effect of Nd and cooling rate.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 resuits showed that the spherical phase in Mg70.8Zn28Nd1.2 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 quasicrystal phase, the growth morphology mainly depended on interface energy, adsorption effect of Nd and cooling rate.

关 键 词：Mg-Zn-Nd icosahedral quasicrystal phase microstructure growth morphology ADSORPTION rare earths 

分 类 号：TG146.22[一般工业技术—材料科学与工程]