In order to analyze the strengthen behaviors of the Y element, the microstructures and mechanical properties of Mg-10Gd-0.2Zn-xY-0.4Zr (x = 0, 1 wt%) two alloys were investigated. Based on the experimental results, Y addition could largely refine the size of β′ precipitate and increase its number density. This phenomenon has been analyzed by theoretical studies in this paper. Due to the fine and dense β′ precipitates, the mechanical properties of the Y-containing alloy was highly improved. In addition, β₁ precipitate also has important contribution to the mechanical property. Based on the TEM observation, after tensile test, the β′ precipitates were obviously sheared by the slip dislocations in Y-containing and Y-free alloy, then, it illustrates that the strengthen effect in both two alloys was mainly derived from the shearable mechanism.

为了分析Y元素的强化行为，研究了Mg-10Gd-0.2Zn- x Y-0.4Zr（x  = 0，1 wt％）两种合金的显微组织和力学性能。根据实验结果，添加Y可以大大改善β'沉淀的尺寸并增加其数量密度。本文已通过理论研究对该现象进行了分析。由于细小且致密的β'析出物，含Y合金的机械性能得到了极大的改善。另外，β _1个沉淀物还具有机械性能的重要贡献。根据TEM观察，拉伸试验后，β'沉淀明显被剪切。 含Y和无Y合金的滑移位错，说明这两种合金的强化作用主要来自可剪切机制。