Preparation of bulk glassy Pd40Ni10Cu30P20 alloy of 40 mm in diameter by water quenching

Cylindrical glassy alloys with diameters up to 40 mm were prepared for a Pd40Ni10Cu30P20 alloy with a high reduced glass transition temperature (T-g/T-m) of 0.71 by water quenching the molten alloy in the quartz tube. The bulk glassy alloy with a diameter of 40 mm exhibits good metallic luster on the outer surface. 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 (Delta T-x=T-x-T-g) and the melting temperature (T-m) are measured to be 575, 95 and 804 K, respectively, for the Pd40Ni10Cu30P20 alloy with a diameter of 40 mm. The deviation of Cu content from 30 at%Cu in the Pd40Ni40-xCuxP20 system causes a steep increase in T-m and a decrease in T-g/T-m, leading to the decrease in the glass-forming ability. The successes of finding the new Pd-Cu base alloy composition with the large Delta T-x and T-g/T-m values and preparing the bulk glassy alloy with a diameter of 40 mm are encouraging for the future development of glassy alloys.