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Indexed by:期刊论文

Date of Publication:2010-07-01

Journal:International Conference on Bulk Metallic Glasses held at the 2009 TMS Annual Meeting

Included Journals:SCIE、EI、CPCI-S

Volume:41A

Issue:7

Page Number:1685-1690

ISSN No.:1073-5623

Abstract:Addition of a small amount of Nb to the (Fe,Co)-Gd-B glassy alloy in (Fe(0.9)Co(0.1))(71.5-x) Nb (x) Gd(3.5)B(25) increased the stabilization of supercooled liquid. The largest supercooled liquid region of 104 K was obtained for the x = 2 alloy. A distinct two-stage-like glass transition was observed with further incresing Nb content. The nanoscale (Fe,Co)(23)B(6) phase precipitated in the glassy matrix after annealing, while the two-stage-like glass transition disappeared, indicating that the anomalous glass transition behavior originates from the exothermic reaction for the formation of the (Fe,Co)(23)B(6) phase in the supercooled liquid region. The glass-forming ability (GFA) also increased by addition of Nb, leading to formation of the bulk glass form for the Nb-doped alloys. The best GFA with a diameter of over 3 mm was achieved for the x = 4 alloy. The (Fe,Co)-Gd-Nb-B glassy alloys exhibited good magnetic properties, i.e., rather high saturation magnetization of 0.81 to 1.22 T, low coercive force of 2.5 to 5.8 A/m, and low saturated magnetostriction of 9 to 19 x 10(-6). In addition, the glassy alloys also possessed very high compressive fracture strength of 3842 to 3916 MPa and high Vickers hardness of 1025 to 1076.