Effect of Yttrium Addition on Thermal Stability and Glass Forming Ability in Fe-TM (Mn, Mo, Ni)-B Ternary Alloys

The effect of Y addition on the glass forming ability (GFA) of in Fe70TM(TM=Mn,Mo, Ni)13B17 alloys have been examined in the present study. Substitution of 3-10 at % Fe with Y improves the GFA. Fe70xMn13B17Yx (x 5) and Fe70xMo13B17Yx (x 3) alloys exhibit high Trg ( Tg=Tl) (>0:55) and ( Tx=Tl þ Tg) (>0:37) values enabling fabrication of 1mm diameter bulk metallic glass. The GFA improves when addition of Y decreases the melting temperature, and, at the same time, increases the crystallization onset temperature. Extended Kissinger analysis of the DSC data indicates that a kinetic boundary condition for the formation of the amorphous phase widens by addition of Y