Abstract
The Mg60Cu30Y10 and Mg65Cu20Y10Zn5 bulk metallic glasses in the form of a rod 2 mm in diameter were successfully prepared by the conventional Cu-mold casting method. The addition of Zn caused the decrease in the crystallization and melting temperatures in comparison with the Mg60Cu30Y10 alloy. The crystallization and melting temperatures are crucial factors that influence the casting process. An increase in annealing temperature leads to structural changes by the formation of the crystalline phases and lowers the compressive strength. These results obtained for the Mg-based bulk metallic glasses (Mg-BMGs) are important for some practical reasons, in particular, for developing the fabrication process. It has been shown that minor addition of an alloying element can change glass-forming ability and strength of the Mg-BMGs.
Highlights
Mg-based bulk metallic glasses (Mg-BMGs) are of special interest, since they allow obtaining light-weight and low-cost materials
The application area of Mg-BMGs can be expanded by enhancing glassforming ability (GFA) that is related to various parameters, such as
The examined alloys exhibit the sequence of the glasstransition (Tg), the onset (Tx), and peak (Tp) crystallization temperature
Summary
Mg-based bulk metallic glasses (Mg-BMGs) are of special interest, since they allow obtaining light-weight and low-cost materials. High GFA was achieved for the Mg65Cu15Ag10Y2Gd8 and Mg65Cu7.5Ni7.5 Zn5Ag5Y10 bulk glassy alloys in the form of a rod with diameter up to 9 mm (Ref 7). As it has been previously reported, the increase of the multi-component interaction in alloys is a way to develop new glassy materials. Men et al (Ref 3) have substituted the copper in the Mg65Cu25Y10 alloy with Zn to form a quaternary Mg65Cu20Zn5Y10 alloy. The application area of Mg-BMGs can be expanded by enhancing GFA that is related to various parameters, such as DTx (supercooled liquid region) or Trg (reduced glass-transition temperature)
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