Abstract
The glass forming abilities (GFA) of Mg 65Cu 25− x Y 10Ni x alloys were investigated by copper mold casting. The evolution of microstructure of master alloys and the structures of as-cast alloys were checked by optical microscopy, X-ray diffraction and differential scanning calorimeter. It was found that the highest GFA was not exactly at the eutectic point of the Mg 65Cu 25Y 10 alloy according to the melting temperature analyzed. Mg 65Cu 25Y 10 revealed a dendrite microstructure while Mg 65Cu 22Ni 3Y 10 exhibited a eutectic microstructure that had a relatively high GFA. The deviation of eutectic microstructure and the deviation of the best GFA composition from the eutectic point can be explained in terms of a skewed coupled eutectic zone, and the higher glass-transition temperature on the hypereutectic side.
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