多元块体金属玻璃合金成分的本征设计——多元Miedema模型理论和等效键参数理论的应用

Intrinsic Design of Multicomponent Bulk Amorphous Alloys——Applications of Multicomponent Miedema Model Theory and Equivalent Bond Parameter Theory

摘要:

用多元Miedema模型理论和等效键参数理论对Gd(Tb)-Co-Al多元合金成分的块体非晶形成能力进行了预设计，针对预设计的合金成分用水冷铜模吸铸法制备出了一系列不同直径（1，3，5 mm）的Gd基合金样品。利用X射线衍射仪确定合金的结构，用热分析法研究了合金的玻璃转变、晶化和熔化行为。实验证明，采用多元Miedema模型理论和等效键参数理论能有效地进行块体非晶合金的成分设计，理论与实验结果能较好地符合。

Abstract:

Glass-forming ability of multicomponent Gd (Tb)-Co-Al alloys was predicted by multicomponent Miedema model theory and equivalent bond parameter theory. The pre-designed alloy samples were prepared by casting the melt ingots into a water-cooled copper mould with various diameters such as 1, 3, 5 mm. The structure of the alloy samples were analyzed by X-ray diffraction. The glass transition, crystallization and melting behavior of the alloys were investigated by differential scanning calorimetry (DSC). The result shows that the multicomponent Miedema model theory and the equivalent bond parameter theory are effective on composition design of bulk amorphous alloys, and the experimental outcome approximately accords with the theoretical prediction.