Abstract The as-extruded Mg-10Al2Y master alloy was chosen as a novel grain refiner for as-cast Mg-3Y alloy. Contrast samples of addition of pure Al and Mg-Zr master alloy into cast Mg-3Y alloy have been prepared under the same conditions. In this study, the influence of addition amounts of Al2Y and holding time on grain refinement efficiency as well as tensile properties were investigated. And the grain refining ability of the Al2Y particles was systematically evaluated in terms of the addition amounts, number density of the Al2Y particles and holding time. The optimal addition amount of Al2Y is 2 wt%, which corresponds to number density of the polygonal Al2Y particles is 420–460/mm2. The Mg-10Al2Y master alloy has significant refinement performance and no refining recession occurred at the holding time within 60 min, or the settling time up to 180 min. Grain refinement and the second phase strengthening of uniformly distributed Al2Y particles contribute to the simultaneous enhancement Mg-3Y alloy strength and elongation.

中文翻译：

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Mg-10Al2Y中间合金对Mg-3Y合金的晶粒细化

摘要 选择挤压态Mg-10Al2Y中间合金作为铸态Mg-3Y合金的新型晶粒细化剂。在相同条件下制备了在铸造Mg-3Y合金中加入纯Al和Mg-Zr中间合金的对比样品。在本研究中，研究了 Al2Y 的添加量和保温时间对晶粒细化效率和拉伸性能的影响。并且根据Al2Y颗粒的添加量、数量密度和保持时间系统地评价Al2Y颗粒的晶粒细化能力。Al2Y 的最佳添加量为 2 wt%，对应的多边形 Al2Y 颗粒数密度为 420-460/mm2。Mg-10Al2Y中间合金具有显着的细化性能，保温时间在60 min内未出现细化衰退，或稳定时间长达 180 分钟。均匀分布的 Al2Y 颗粒的晶粒细化和第二相强化有助于同时提高 Mg-3Y 合金的强度和伸长率。