Effects of transition metal substitution on the glass-formation ability and magnetic properties of Fe62Co9.5Nd3Dy0.5B25 glassy alloy

Abstract

Articles you may be interested inEffects of alloying elements and temperature on the elastic properties of dilute Ni-base superalloys from firstprinciples calculations J. Appl. Phys. 112, 053515 (2012); 10.1063/1.4749406Soft-ferromagnetic bulk glassy alloys with large magnetostriction and high glass-forming ability AIP Advances 1, 042110 (2011); 10.1063/1.3654397 Two-stage-like glass transition and the glass-forming ability of a soft magnetic Fe-based glassy alloy Fe-Co-Nd-Dy-B glassy alloys are a current type of ferromagnetic material. To increase their glass-forming ability against the growth of a crystallization phase, the effects of the addition of transition metals TM ͑TMϭV, Nb, Ta, Cr, Mo, and W͒ on the glass-formation ability and magnetic properties of Fe 62 Co 9.5 Nd 3 Dy 0.5 B 25 glassy alloy have been investigated. The substitution of 2 at. % elements TM ͑ϭNb, Ta, Mo, and W͒ for Fe and Co increases crystallization temperature T x and decreases the onset temperature of solidification T m , leading to a significant increase in the thermal stability against crystallization for Fe 60.3 Co 9.2 TM 2 Nd 3 Dy 0.5 B 25 . The difference (⌬T x ϭT x ϪT g ) between T x and the glass transition temperature T g increases from 55 K at 0 at. % TM to 87 K at 2 at. % TM. The bulk glassy alloy with a diameter up to 1.2 mm was produced by copper mold casting. Also no distinct changes in T g , T x and ⌬T x are seen for the addition of Cr and V. The results can be explained by the difference of atomic size in the additional elements. The saturation magnetization decreases slightly by the addition of 2 at. % TM elements. The saturation magnetization and coercive force of glassy Fe 60.3 Co 9.2 TM 2 Nd 3 Dy 0.5 B 25 alloys are 1.13 to 1.19 T and 3.85-4.98 A/m, respectively.

Enhanced soft-magnetic and corrosion properties of Fe-based bulk glassy alloys with improved plasticity through the addition of Cr

“…The homogeneous contrast in the HRTEM image and a broad halo in the SAED pattern confirm the formation of a glassy single structure. It is thus inferred that in comparison with those for the Fe-Si-B alloys, the lower H c and higher μ e values are due to the lower λ s values resulting from high GFA as well as a small amounts of Cr addition, in agreement with the previous results of the (Fe 1−x Cr x ) z (Si 0.3 B 0.7 ) 100−z amorphous alloys, Co-Cr-Fe-Al-Ga-P-B-C and Fe-Co-Cr-Nd-Dy-B glassy alloys [13,14,26]. In addition, with an increase of Cr content from 0 to 4 at.%, I s decreases from 1.04 to 0.81 T, due to alloying Fe with element Cr, which decreases the moment per Fe atom in the alloy [12].…”

Effect of Nb Concentration on Thermal Stability and Glass-Forming Ability of Soft Magnetic (Fe,Co)-Gd-Nb-B Glassy Alloys

“…The largest DT x was 87 K for the alloy with TM = Nb addition. [20] However, the GFA was not so high, and the critical diameter (d c ) for formation of a single glassy phase was below 1.5 mm. [21] In this study, with the aim of developing a new ferromagnetic BGA with high GFA and large DT x , we have investigated the effect of Nb concentration on the stabilization of supercooled liquid, GFA, and magnetic properties of a (Fe,Co)-Gd-B glassy alloy.…”

Fabrication and soft-magnetic properties of Fe–B–Nb–Y glassy powder compacts by spark plasma sintering technique

“…Recently, more attention has been paid to improve the soft-magnetic properties of the Fe-based amorphous alloys owing to their high efficiency on energy transform as a core material, since their soft magnetic properties have a direct effect on the efficiency of transformers during stepping up or stepping down [4][5][6][7][8][9][10][11][12][13][14][15].…”