Composition dependence of the glass-forming ability and soft magnetic properties of Fe-rich Fe–Nb–B ternary alloys

The glass forming ability and magnetic properties were investigated for adding neodymium to the Fe71-xNb4B25Ndx (x=0, 3, 5, 7,10) alloys prepared by copper suction casting. It was found that proper neodymium (x=5~10 at.%) could improve glass forming ability of Fe-Nb-B alloys effectively. Bulk amorphous Fe66Nd5B25Nb4 and Fe64Nd7B25Nb4 samples were obtained and presented high thermal stability and good soft magnetic properties. The value of activation energy of the first crystallization peak for the bulk amorphous alloy Fe64Nd7B25Nb4 is 683 kJ/mol.

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Co- and Fe-based multicomponent bulk metallic glasses designed by cluster line and minor alloying

Journal of Materials Research ◽

10.1557/jmr.2008.0210 ◽

2008 ◽

Vol 23 (6) ◽

pp. 1543-1550 ◽

Cited By ~ 8

Author(s):

Q. Wang ◽

C.L. Zhu ◽

Y.H. Li ◽

X. Cheng ◽

W.R. Chen ◽

...

Keyword(s):

Magnetic Properties ◽

Metallic Glass ◽

Metallic Glasses ◽

Ternary Alloys ◽

Soft Magnetic Properties ◽

Soft Magnetic ◽

Glass Forming ◽

Compact Binary ◽

Binary Clusters ◽

Composition Formula

Bulk metallic glass (BMG) formations in Co- and Fe-based alloy systems are investigated by using our cluster line approach in combination with minor alloying principle. Basic ternary alloy compositions in Co–B–Si, Fe–B–Y, and Fe–B–Si systems are first determined by cluster lines defined by linking special binary clusters to third elements. Then the basic ternary alloys are further minor alloyed with 3 to 5 at.% Nb to improve glass-forming abilities (GFAs) and ϕ3 mm BMGs are formed in (Co8B3–Si)–Nb and (Fe8B3–Y)–Nb but not in (Fe8B3–Si)–Nb, TM8B3 (TM = Fe, Co) being the most compact binary cluster. The BMGs are expressed approximately with a unified simple composition formula: (TM8B3)1M1, M = (Si, Nb) or (Y, Nb). Finally, mutual Fe and Co substitutions further improve the GFAs as well as the soft magnetic properties, e.g., Is reaching 0.98 T and Hc < 6 A/m for the Co–Fe–B–Si–Nb BMGs. Using the (cluster)1(glue atom)1 model, a new ternary BMG Fe8B3Nb1 is obtained.

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Effect of B2O3 Fluxing on Glass-Forming Ability and Soft Magnetic Properties of Fe(-Co)-B-Si-Nb Bulk Metallic Glasses

Materials Science Forum ◽

10.4028/www.scientific.net/msf.783-786.1895 ◽

2014 ◽

Vol 783-786 ◽

pp. 1895-1900 ◽

Cited By ~ 1

Author(s):

Teruo Bitoh

Keyword(s):

Magnetic Properties ◽

Metallic Glasses ◽

Bulk Metallic Glasses ◽

Glass Forming Ability ◽

The Other ◽

Maximum Diameter ◽

Soft Magnetic Properties ◽

Copper Mold ◽

Soft Magnetic ◽

Glass Forming

The effect of B2O3 fluxing on the glass-forming ability (GFA), the structure and the soft magnetic properties of Fe (-Co)-B-Si-Nb bulk metallic glasses (BMGs) has been investigated. The large Fe-Co-B-Si-Nb BMG specimens with diameters up to 7.7 mm, which is approximately 1.5 times as large as that of the maximum diameter of the copper mold cast one (= 5 mm), were prepared by the fluxing and water quenching. Thus the GFA of the Fe-Co-B-Si-Nb BMG are improved by the fluxing. It was confirmed that the soft magnetic properties of the Fe-Co-B-Si-Nb BMG are also improved by the fluxing. On the other hand, it was found for the Co-free Fe-B-Si-Nb BMG that the B2O3 fluxing promotes the precipitation of the α-Fe (-Si) and Fe2B phases in the central region of the specimens; i.e., the GFA of the Fe-B-Si-Nb BMG is decreased by the fluxing. The Fe-B-Si-Nb BMG specimens show a flat hysteresis loop, indicating a good linear relationship between the magnetic induction and the applied magnetic field. These results of the Fe-B-Si-Nb BMG show that it is possible to develop a new soft magnetic material that exhibits constant permeability, which is necessary for producing inductors and choke coils.

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