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Fe -based bulk ferromagnetic glassy alloys with diameters up to 5mm 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 3900–4250MPa, Young’s modulus of 190–210GPa, 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 0.84–1.13T, low coercive force of 1.5–2.7A∕m, high permeability exceeding 1.2×104, and Curie temperature of 600–690K.

Among many kinds of bulk metallic glasses (BMGs), Fe-based BMGs with good magnetic properties, high strength and low materials cost should have great potential for wide variety of applications. However, the glass-forming metal elements such as Al, Ga, Nb, Mo, Y and so forth in the Fe-based BMGs significantly decrease saturation magnetization (J s ) which is a essential property as soft magnetic materials and also increase the material cost.The coexistence of high Fe content and high glass-forming ability (GFA) has been earnestly desired from academia to industry. We report a novel Fe 76 Si 9 B 10 P 5 (at%) bulk metallic glass with unusual combination of high J s of 1.51 T due to high Fe content and high GFA leading to a glassy rod with a diameter of 2.5 mm despite not-containing any glass-forming metal elements. This alloy composed of familiar and low-priced elements, also exhibiting very excellent magnetic softness and rather high strength, has a great advantage for engineering and industry, and thus should make a contribution to conservation of earth resources and environment through energy saving.

Articles you may be interested inEnhancement of glass-forming ability of FeCoNiBSiNb bulk glassy alloys with superhigh strength and good softmagnetic properties

Articles you may be interested inTunable magnetic and magnetocaloric properties in heavy rare-earth based metallic glasses through the substitution of similar elements Magnetocaloric effect of Ho-, Dy-, and Er-based bulk metallic glasses in helium and hydrogen liquefaction temperature range Appl. Phys. Lett. 90, 211903 (2007); 10.1063/1.2741120Behavior of some heavy and light rare earth-cobalt magnets at high temperature Electronegativity of the constituent rare-earth metals as a factor stabilizing the supercooled liquid region in Albased metallic glasses (RE ¼ Gd, Dy, and Tm) high-entropy bulk metallic glasses (HE-BMGs) with good magnetocaloric properties are fabricated successfully. The HE-BMGs exhibit a second-order magnetic phase transition. The peak of magnetic entropy change (DS pk M ) and refrigerant capacity (RC) reaches 15.0 J kg À1 K À1 and 627 J kg À1 at 5 T, respectively, which is larger than most rare earth based BMGs. The heterogeneous nature of glasses also contributes to the large DS pk M and RC. In addition, the magnetic ordering temperature, DS pk M and RC can be widely tuned by alloying different rare earth elements. These results suggest that the HE-BMGs are promising magnetic refrigerant at low temperatures. V C 2015 AIP Publishing LLC.

Articles you may be interested inEnhancement of glass-forming ability of FeCoNiBSiNb bulk glassy alloys with superhigh strength and good softmagnetic properties

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