Glass forming ability, magnetic and mechanical properties of (Fe72Mo4B24)100−xDyx (x = 4–7) bulk metallic glasses

(Fe72Mo4B24)100−xDyx (x = 4–7) bulk metallic glasses (BMGs) cylindrical rods with diameters up to 3 mm and a length of 30 mm were prepared by copper mold casting. The influence of Dy content on the glass forming ability (GFA) of Fe–Mo–B–Dy alloy system was investigated. With the increase of Dy content, the supercooled liquid region ΔTx (=Tx − Tg) increased from 75 K for x = 4 to 91 K for x = 6. The (Fe72Mo4B24)94Dy6 alloy possessed the largest ΔTx (91 K), indicating the best GFA among the investigated alloys. The BMGs exhibited high compressive fracture strength up to 3071 MPa and micro-Vickers hardness up to 1130 kg/mm2. The appreciable magnetic properties of the alloy system were obtained as well.

Research highlights▶ Synthesis of large size BMGs with (Fe72Mo4B24)100−xDyx (x = 4–7) alloy system. ▶ Improved thermodynamic parameters like Tg of 880 K, Tx of 957 K and ΔTx of 91 K. ▶ Maximum compressive fracture strength up to 3071 MPa and Hv of 1130. ▶ Optimal soft magnetic properties as Ms of 78.87 emu/g and Hc of 5.03 Oe.