中文摘要：

讨论了Mn对镁基准晶中间合金中三维二十面体球形准晶相形成过程的影响。研究表明：当在Mg-Zn-Y基准晶中间合金熔体中加入一定量的Mn元素后，在常规铸造条件下的结晶凝固过程中，完全可以改变Mg-Zn-Y基准晶中间合金中准晶的形成过程，获得稳定的均一二十面体初生Mg45Zn47Y5Mn3准晶相，避免了十面体准晶相的出现，改变了准晶相最终的形貌，由于Mn的加入，使初生准晶相的颗粒尺寸明显变小，使之由尺寸为60gm～80gm的花瓣状变成尺寸为≤20gm的球形状。Mn的加入，降低了镁基准晶中间合金的生产成本，为工业化生产提供了便利条件。

英文摘要：

The effect of Mn on formation of three-dimension spherical icosahedral quasicrystal phase in Mg-based master alloy has been discussed. Experimental results show that in the solidification process under normal casting condition, the adding certain amount of Mn into the melt would surely change the formation process of Mg-Zn-Y quasicrystal containing master alloy, which avoided the appearance of decahedral quasicrystal phase, generated thermodynamically stable and homogeneously distributed Mg-Zn-Y-Mn Icosahedral quasicrystal, resulted in transformation of morphology of Icosahedral quasicrystal from petal-like one to spherical one. Moreover, because of the addition of Mn, icosahedral quasicrystal grain size changed from large petal-like （60 um-80 um） to small spherical （≤ 20 um）.The addition of Mn could lower the production cost of Mg-based quasicrystals containing master alloy, providing beneficial conditions for industrialization.