Effect of Titanium on Glass-forming Ability of Cu-Zr-Al Alloys

Abstract

The effect of partial substitution of Ti for Zr on the glass-forming ability was studied in Cu 50 Zr 45-x Ti x Al 5 (x = 0, 2.5, 5, 10) alloys by using thermal analysis and X-ray diffractometry. The glass transition temperature, Tg, of Cu 50 Zr 45-x Ti x Al 5 alloys decreased from 707 K at x = 0 to 700K at x = 2.5, and keeps almost constant with further increase of x. On the other hand, the crystallization temperature, T x , decreased gradually from 767 K at x = 0 to 741 K at x = 10. The partial substitution of Zr by Ti in Cu 50 Zr 45 Al 5 alloy promotes the glass formation. The maximum diameter for glass formation by injection casting increased from 3 mm for Cu 50 Zr 45 Al 5 alloy to 4 mm for Cu 50 Zr 42.5 Ti 2.5 Al 5 alloy.