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From Eutectic Clusters to Bulk Metallic Glasses of Zr–Al–Cu System

More empirical rules have been proposed to explain the composition rules of bulk metallic glasses (BMGs), such as Inoue’s three criteria, deep eutectic, confusion principle and more recently cluster line principle proposed by our research group. The cluster line principle refers to the fact that good glass formers are located along straight composition lines linking special clusters to the third elements in ternary alloy phase diagram. This approach has already been proved quite effective in determining the optimum glass forming composition in ternary systems so long as appropriate clusters are chosen. All these works show that both clusters and eutectic compositions have close relationship with BMGs. So the key issue in applying cluster line approach is the determination of the right clusters. It would be interesting to link the cluster property of an alloy phase to metallic glass formation. For this objective, in this paper firstly the clusters of Cu–Zr binary alloy phases are analyzed, and cluster formula [effective cluster](glue atom)x, is put out to describe the alloy phase. Then some special clusters, termed eutectic clusters, are highlighted to explain the eutectic compositions of Cu–Zr system, as a general expression: eutectic composition1⁄4 [euteceutectic cluster]1þ (glue atom)1. Finally, the correlation of these eutectic clusters with metallic glass formation is revealed, and BMGs compositions of Zr–Al–Cu system can be explained very well using these eutectic clusters and cluster line rule.