中文摘要：

为了改进镁的力量，坚韧和热抵抗，合金，微观结构和 icosahedral quasicrystal 增强的 ZA54 合金的机械性质分阶段执行(我阶段) 粒子被学习。除了 -Mg, ，阶段和 -phase, MgZnYMn 我阶段粒子能被 icosahedral 的增加在基于 ZA54 的 composites 获得包含 quasicrystal 的 Mg-Zn-Y-Mn 主人合金。进 ZA54 合金的 MgZnYMn 我阶段的介绍有大贡献到矩阵微观结构和机械性质的改进的精炼。当基于 Mg 的球形的 quasicrystal 主人合金的增加直到 3.5% 时(集体部分) ，基于 ZA54 的 composites 的宏坚硬被增加到 HB 68。composites 的影响坚韧到达 18.3 J/cm2 的山峰价值，它比 ZA54 母亲合金的高是大约 29% 。在有 2.5% 的主人合金增加(473 K ) 的周围、提高的温度的最高张力的性质也与 3.5% 在基于 ZA54 的 composites 被获得(集体部分) Mg-Zn-Y-Mn 主人合金增加。在周围、提高的温度的 composites 的最终的张力的力量是 192.5 MPa 和 174 MPa，它分别地比 ZA54 母亲合金的高是 23.4% 和 33.8% 。改进机械性质主要在谷物边界上被归因于我阶段的卡住的效果。

英文摘要：

To improve the strength, toughness and heat-resistance of magnesium alloy, the microstrucmre and mechanical properties of ZA54 alloy reinforced by icosahedral quasicrystal phase （/-phase） particles were studied. Except α-Mg, φ-phase and τ-phase, MgZnYMn I-phase particles can be obtained in ZA54-based composites by the addition of icosahedral quasicrystal-contained Mg-Zn-Y-Mn master alloy. The introduction of MgZnYMn I-phase into ZA54 alloy has great contribution to the refinement of matrix microstructures and the improvement of mechanical properties. When the addition of Mg-based spherical quasicrystal master alloy is up to 3.5% （mass fraction）, the macro-hardness of ZA54-based composites is increased to HB 68. The impact toughness of composites reaches the peak value of 18.3 J/cm^2, which is about 29% higher than that of ZA54 mother alloy. The highest tensile properties at ambient and elevated temperatures with master alloy addition of 2.5% （473 K） are also obtained in ZA54-based composites with 3.5% （mass fraction） Mg-Zn-Y-Mn master alloy addition. The ultimate tensile strength of composites at ambient and elevated temperatures are 192.5 MPa and 174 MPa, which are 23.4% and 33.8% higher than that of ZA54 mother alloy, respectively. The improved mechanical properties are mainly attributed to the pinning effect of I-phase on grain boundaries.