Abstract
(Fe72Mo4B24)(100-x)Dy-x (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 Delta T-x (=T-x-T-g) increased from 75 K for x=4 to 91 K for x=6. The (Fe72Mo4B24)(94)Dy-6 alloy possessed the largest Delta T-x (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/mm(2). The appreciable magnetic properties of the alloy system were obtained as well. (C) 2010 Elsevier B.V. All rights reserved.