Abstract
The composition dependence of glass forming ability in the ternary Al-Cu-Y system is predicted by thermodynamic calculations based on the Miedema’s model and Alonso’s method. By comparing the relative energetic status of the amorphous phase versus the solid solution phase, a hexagonal composition region that energetically favoring the metallic glass formation is predicted. The glass formation driving force and crystallization resistance are further calculated and the composition of Al72Cu10Y18 is pinpointed with the largest glass forming ability in the Al-Cu-Y system. The calculation results are well supported by the experimental observations reported in the literature.
Highlights
Metallic glasses, i.e., amorphous alloys, have attracted considerable interest since their first discovery in 1960s by Duwez et al [1] in the Au-Si system using liquid melt quenching technique
Later in the 1980s, since the first finding of the bulk glassy millimeter-diameter rods in the Pd-Cu-Si system using simple suction casting methods [6], bulk metallic glasses (BMGs), with excellent glass forming ability (GFA), have been developed in many multicomponent systems and remarkably broadened the applications of this class of metallic materials [7,8]
In the field of BMGs, one of the most important issues is to clarify the formation mechanism, because a clear understanding of metallic glass formation would serve as guidance for choosing the relevant components and designing an appropriate chemical stoichiometry for obtaining the desired metallic glasses [9,10,11]
Summary
I.e., amorphous alloys, have attracted considerable interest since their first discovery in 1960s by Duwez et al [1] in the Au-Si system using liquid melt quenching technique. In the field of BMGs, one of the most important issues is to clarify the formation mechanism, because a clear understanding of metallic glass formation would serve as guidance for choosing the relevant components and designing an appropriate chemical stoichiometry for obtaining the desired metallic glasses [9,10,11] Concerning this issue, researchers have been working hard in the past decades and have proposed some empirical criteria or rules to predict in which system and at what chemical stoichiometry, metallic glass is most likely to be obtained [12,13,14,15]. Some essential experimental parameters, such as glass transition temperature of an alloy, can only be obtained after the glass has been prepared and are not predictable quantities It requires heavy work of repeatedly melting-quenching and thermal analyses of numerous alloys to pinpoint the glass formation compositions. Al-TM-RE alloy systems, is selected here for investigation
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