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We report a ductile Fe-Mo-P-C-B bulk metallic glass (BMG) with good soft-magnetic properties. The Fe-Mo-P-C-B BMG with high Poisson's ratio of 0.325 and low glass transition temperature of 708 K exhibits plastic strain up to 5.5% before final failure and high fracture strength of 3280 MPa in compression. The Fe-based BMG possesses high saturation magnetization of 1.1 T, low coercive force of 1.8 Am  1 and high permeability of 55300. The Fe-Mo-P-C-B BMG with this combination of noticeable ductility, high strength and good soft-magnetic properties previously not observed simultaneously in Fe-based glassy alloys has promising potential in functional and structural applications. (doi:10.2320/matertrans.48.1157) duction melting mixtures of pure Fe (99.9 mass%), Mo (99.9 mass%), C (99.9 mass%) and B (99.9 mass%), and pre- alloyed Fe-P with known analyzed composition under a high- purity argon atmosphere. From the master alloy, ribbons were prepared by melt-spinning, and cylindrical rod and ring- shaped samples were prepared by copper mold casting under an argon atmosphere. The structure of the specimens was examined by X-ray diffracometry (XRD) with Cu-K radiation and transmission electron microscopy (TEM). Glass transition, crystallization and melting behaviors of the glassy samples were evaluated by differential scanning calorimetry (DSC) at a heating rate of 0.33 K/s. Compressive deformation tests were performed on a material test system (MTS) at a strain rate of 2:1  10  4 s  1 at room temperature using glassy rods with a dimension of 1 mm in diameter and 2 mm in length. Samples subjected to compressive tests were observed by scanning electron microscopy (SEM). Ultra- sound measurements were carried out to determine the elastic constants and the Poisson's ratio of the BMG. Saturation magnetization (Bs) was measured by a vibrating sample magnetometer (VSM) with a glassy rod of 1 mm in diameter. Coercive force (Hc) and DC permeability ( DC) were evaluated by a DC B-H loop tracer using the glassy ring- shaped samples. Structure and magnetic properties of the bulk glassy specimens annealed at a temperature of (Tg  50) K( Tg is glass transition temperature) for 10 minutes were also examined. 3. Results and Discussion

Ductile Fe-Based Bulk Metallic Glass with Good Soft-Magnetic Properties