Effect of Nb Addition on the Glass-Forming Ability, Soft-Magnetic Properties and Mechanical Properties of CoFeNiBSiNb Bulk Glassy Alloys

Abstract:

The effect of Nb addition on the glass-forming ability (GFA), soft-magnetic properties and mechanical properties of [(Co_0.65Fe_0.35)_0.9Ni_0.1]_73-xB_21.9Si_5.1Nb_x (x=36) alloy system were investigated. The results showed that by adjusting the content of Nb, the thermal stability of the supercooled liquid and the GFA increased effectively. With increasing the amount of Nb, the supercooled liquid region (ΔT_x) increased from 45 to 65 K and the reduced glass transition temperature (T_rg=T_g/T_l) was located in the range of 0.5840.644. As a result, the [(Co_0.65Fe_0.35)_0.9Ni_0.1]_73-xB_21.9Si_5.1Nb_x bulk glassy alloys (BGAs) with diameters up to 5.0 mm were produced by copper mold casting. In addition to the high GFA, the Co-based glassy alloys exhibited excellent soft-magnetic properties, i.e., saturation magnetization of 0.530.81 T, low coercive force of 0.511.75 A/m, and high effective permeability of (1.522.53)×10⁴ at 1 kHz under a field of 1 A/m. Besides, the Co-based BGAs also exhibited super high fracture strength of 42704490 MPa and vickers hardness of 11271182.

• Periodical: Materials Science Forum (Volumes 745-746)
• Pages: 815-822
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.745-746.815
• Online since: February 2013
• Authors: Ya Qiang Dong, Qi Kui Man, Bao Long Shen
• Keywords: Glass-Forming Ability, Mechanical Property, Soft-Magnetic Properties, Supercooled Liquid Region

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