BULK AMORPHOUS Zr57Cu20Al10Ni8Ti5 AND Zr55Cu19Al8Ni8Ti5Si5 ALLOYS PREPARED BY ARC MELTING

Abstract

We have produced bulk amorphous materials by quenching arc melted melts in water cooled copper die. Alloys of the composition Zr 57 Cu 20 Al 10 Ni 8 Ti 5 and Zr 55 Cu 19 Al 8 Ni 8 Ti 5 Si 5 were produced in the form of small cylinders with a diameter of 3 mm and a length of 25 mm. The alloys were investigated by X-ray diffraction and thermal analysis to determine the structure and thermal properties. Complete amorphous X-ray patterns were observed for both alloys. The glass transition temperature is 362°C for the Zr 57 Cu 20 Al 10 Ni 8 Ti 5 alloy and 363°C for the Zr 55 Cu 19 Al 8 Ni 8 Ti 5 Si 5 alloy. The crystallization temperature of the Zr 57 Cu 20 Al 10 Ni 8 Ti 5 alloy was measured to be 414.6°C. The Zr 55 Cu 19 Al 8 Ni 8 Ti 5 Si 5 alloy has a higher crystallization temperature of 425.5°C.