Preparation of Bulk Glassy Mg₆₅Y₁₀Cu₁₅Ag₅Pd₅ Alloy of 12 mm in Diameter by Water Quenching

Abstract

Cylindrical glassy alloys with diameters up to 12 mm were prepared for a Mg₆₅Y₁₀Cu₁₅Ag₅Pd₅ with a high reduced glass transition temperature (T_g⁄T_m) of 0.62 by water quenching the molten alloy in the iron tube. Neither cavities nor voids are seen over the whole inner region and no contrast revealing a crystalline phase is seen over the transverse cross section. The glass transition temperature (T_g), crystallization temperature (T_x), the temperature interval of the supercooled liquid region (ΔT_x=T_x−T_g) and the melting temperature (T_m) are measured to be 436, 468, 32 and 706 K, respectively, for the Mg₆₅Y₁₀Cu₁₅Ag₅Pd₅ alloy with a diameter of 12 mm. The simultaneous addition of Ag and Pd to Mg–Y–Cu system causes an increase in the T_g⁄T_m, leading to an increase in the glass forming ability. It is thus concluded that the application of the water quenching process with the iron tube to the Mg-based glassy alloys is useful for the formation of the bulk glassy alloys.