TI-BASED AMORPHOUS-ALLOYS WITH A WIDE SUPERCOOLED LIQUID REGION

Ti-Cu-Ni-Co quaternary amorphous alloys produced by melt spinning were found to have a wide supercooled liquid region before crystallization , though no glass transition was observed in Ti-Cu binary amorphous al loys. The largest temperature interval of the supercooled liquid regio n (DELTAT(x)) is as large as 90 K for Ti50Cu25Ni20Co5. There is a tend ency for DELTAT(x) to increase with an increase in storage modulus and with a decrease in loss modulus. It is therefore presumed that the in crease in DELTAT(x) for the multicomponent amorphous alloy is due to t he suppression of crystallization for the supercooled liquid resulting from the increase in viscosity.