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中文摘要：
采用常规凝固技术制备了Mg-45Zn-xY（x=1．0，4．0，5．5，8．0，质量分数，％）合金。利用SEM、EDS、OM、TEM、XRD、DSC和硬度测试技术研究了Y对Mg．45Zn-xY系合金组织及性能的影响，同时对准晶相（I-phase）的形成机制进行了分析。结果表明：合金组织主要由a-Mg颗粒或枝晶、花瓣状的Mg3ZnsY准晶相、层片状的（I-phase＋a-Mg）共晶组织以及Mg7Zn3相组成；准晶相形貌、含量及分布与Y含量密切相关，随着Y含量的增加，花瓣状准晶相含量逐渐增加，当Y含量为5．5％时，花瓣状准晶相含量最多，合金的硬度达到最大值，HB为1557MPa，当Y含量为8．0％时，合金中的花瓣状准晶相消失；准晶以层片状共晶组织和花瓣状形式存在，花瓣状的特殊形貌是正二十面体沿五次轴方向生长的结果。
英文摘要：
Mg-45Zn-xY （x=l.0, 4.0, 5.5, 8.0 wt%） alloys were prepared by a conventional solidification technique. The influences of Y on microstructures and properties of Mg-45Zn-xY alloys were investigated by means of SEM, EDS, OM, TEM, XRD, DSC and hardness tests The formation mechanism of quasicrystal was also analyzed. The results show that microstructures of Mg-45Zn-xY alloys consist of a-Mg particle or dendritic crystal, petal-like Mg3Zn6Y quasicrystalline phase （/-phase）, lamellar （I-phase＋a-Mg） eutectic structure and Mg7Zn3 phase. The morphology, the amount and distribution of quasicrystalline phase are closely related to the content of Y. With the increase of Y content, the amount of petal-like quasicrystalline phase increases and when Y content is 5.5 wt%, the alloy has the most petal-like quasicrystalline phase and its hardness reaches the maximum value of HB 1557 MPa. When Y content is 8.0 wt%, the petal-like quasicrystalline phase disappears. Quasicrystalline phase exists in two forms： eutectic structure and petal-like structure, and the special morphology of petal-like structure is the result of icosahedron＇s growth along five-axis direction.
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