The element Cu in the bulk glass-forming alloy Mg65Cu25Y10 was substituted with the element Zn to form a Mg65Cu20Zn5Y10 alloy, which caused a significant improvement of the glass-forming ability of Mg65Cu25Y10 alloy. For the Mg65Cu20Zn5Y10 alloy, fully glassy rod with a 6 mm diameter can be obtained by the copper mold casting. Compared with Zn-free glass, the quaternary Mg65Cu20Zn5Y10 glass exhibits a more complex crystallization process performed through four steps, accompanied by a reduction of the supercooled liquid region DeltaT(x) but a slight increase of the reduced glass transition temperature T-rg.
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