元素Y对Mg—Cu系合金的组织结构和显微硬度的影响

采用铜板空冷和铜辊甩带的方法，研究元素Y对Mg-Cu合金的组织结构和室温硬度的影响。研究表明：元素Y形成的化合物最终富集于枝晶网胞间。随着元素Y的添加，Mg-Cu二元合金试样的晶粒显著细化，显微硬度大幅提高。另外，在快速冷却条件下，Mg90 Cu5Y5试样的微观结构为微晶和非晶的夹杂，形成非晶的能力大大增强。

Efforts of Y and rapid solidification on organization structure and room temperature hardness of Mg-Cu alloy

Mg-Cu alloys were prepared by a method of melt casting on copper and a method of belt throwing in the air. Effects of Y element on organization structure and room temperature hardness of Mg-Cu alloys were studied. The compounds which contain Y element were gathered on the boundary of structure cells. By adding Y element, the crystalline grain of Mg-Cu alloys were small and the microhardness of Mg-Cu alloys were increased. The microstructure by melt casting were crystalline grain, the microstructure by melt throwing were crystalline grain and noncrystalline. In addition, the microstructure of Mg90 Cu5Y5 alloy were crystalline grain and noncrystalline and the ability of spanning noncrystalline was strong.