Abstract
The solidification microstructure of the master alloys (MAs) and slowly cooled alloys (SCAs) for Mg-Cu-Gd ternary system and the best glass former in Mg-Cu-Ag-Gd quaternary system were systematically investigated. the best ternary glass former alloy, Mg61Cu28Gd11, with a critical size (D-c) of 12 mm is correlated with a eutectic reaction L -> Mg2Cu + Mg3CuGd in Mg-Cu-Gd equilibrium phase diagram. And a phase diagram was established for the studied compositions in the Mg-Cu-Gd ternary system. The glass forming ability (GFA) was dramatically improved when Cu is substituted by Ag. In Mg-Cu-Ag-Gd quaternary system, the critical size reached 27 mm for Mg59.5Cu22.9Ag6.6Gd11 and this is the largest D-c for all reported Mg-based bulk metallic glasses (BMGs). The reasons why the Mg59.5Cu22.9Ag6.6Gd11 has an extraordinary glass forming ability was explained from two aspects: stabilization of the liquid and frustration of the competing phase.
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