Superhigh strength and good soft-magnetic properties of (Fe,Co)–B–Si–Nb bulk glassy alloys with high glass-forming ability

Shen, Baolong; Inoue, Akihisa; Chang, Chuntao
November 2004
Applied Physics Letters;11/22/2004, Vol. 85 Issue 21, p4911
Academic Journal
Fe-based bulk ferromagnetic glassy alloys with diameters up to 5 mm were formed in [(Fe1-xCox)0.75B0.2Si0.05]96Nb4 system by the copper mold casting method. The substitution of Co for Fe caused an increase of glass-forming ability as well as an improvement of mechanical and magnetic properties. The bulk glassy alloys exhibited superhigh fracture strength of 3900–4250 MPa, Young’s modulus of 190–210 GPa, elastic strain of 0.02, and plastic strain of 0.0025. The bulk glassy alloys also exhibited good soft magnetic properties, i.e., saturation magnetization of 0.84–1.13 T, low coercive force of 1.5–2.7 A/m, high permeability exceeding 1.2×104, and Curie temperature of 600–690 K.


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