Mechanical and magnetic properties of (Fe72Mo4B24)100−xTbx (x = 4, 5, 6, 7 at.%) bulk glassy alloys

(Fe72Mo4B24)100−xTbx (x = 4, 5, 6, 7 at.%) bulk glassy alloys with diameter of 2 mm were prepared by copper mold casting. The influence of Tb content on glass forming ability was investigated. There is partial crystallization in the alloy when x = 4, while fully amorphous alloys with no detectable crystallization are obtained for x = 5, 6, 7, respectively. DSC curves of the amorphous alloys indicate that this system exhibits a high glass transition temperature (Tg = 848-927 K) and a wide supercooled liquid region up to 104 K. The best glass forming ability is obtained for x = 5. These bulk metallic glasses exhibit good mechanical properties, with the compressive strength up to 3163 MPa, and Hv up to 1149. In addition, the alloys exhibit relatively good soft magnetic properties, with Ms up to 69.205 emu/g and Hc as low as 4 Oe.