Fabrication of ternary Mg-Cu-Gd bulk metallic glass with high glass-forming ability under air atmosphere

摘要

A new Mg_(65)Cu_(25)Gd_(10) alloy having significantly improved glass-forming ability (GFA) has been developed. In this article, we show that the ternary Mg_(65)Cu_(25)Gd_(10) bulk metallic glass with diameter of at least 8 mm can successfully be fabricated by a conventional Cu-mold casting method in air atmosphere. The critical cooling rate for glass formation was estimated on the order of magnitude of approximately 1 K/s. When compared with the GFA of Mg_(65)Cu_(25)Gd_(10) alloy, the significantly improved GFA of Mg_(65)Cu_(25)Gd_(10) alloy cannot be explained by ΔT_x and T_(rg) values.