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In the present work we have studied the formation of bulk metallic glass in the Zr–Co–Al system. Using the atomic-cluster-plus-glue-atom model, a cluster formula composition, [Co2Al2Zr7](Co2Zr) = Zr57.1Co28.6Al14.3), was derived to explore bulk metallic glass formation. Glass rod of 10 mm diameter can be made at this composition by copper mold casting. The glass alloy exhibited an undercooled liquid...