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Sheng Z.H.,Shandong University | Pang J.,Qingdao Yunlu Energy Technology Company Ltd | Wang X.,Shandong University | Wen K.,Shandong University | And 3 more authors.
Journal of Non-Crystalline Solids | Year: 2016

The magnetization, electric resistivity ρ and anisotropy of Fe78Si9B13 glassy samples annealed by direct current heating (DCH) have been studied using various techniques. With increasing the direct current density (iDC), the saturation magnetization Ms and coercivity Hc of samples change non-monotonically, which can be explained by structural unit transition (fcc → bcc) at low iDC and the precipitation of Fe2B at high iDC. The samples after DCH in longitudinal direction show a higher Ms, and a lower ρ than those in transverse direction, which is due to magnetic anisotropy and thermal expansion anisotropy of Fe78Si9B13 amorphous ribbon. The sample after DCH in longitudinal direction with iDC = 2.5 × 105 A/cm2 has excellent comprehensive soft magnetic properties of Ms = 179.0 emu/g and Hc = 1.8 A/m. The anisotropic information of Fe-based glasses is helpful to fully explore the potential in their magnetic properties. © 2016 Elsevier B.V. Source

Zhang H.-D.,Shandong University | Li X.-Y.,Qingdao Yunlu Energy Technology Company Ltd | Pang J.,Qingdao Yunlu Energy Technology Company Ltd | Yin L.-J.,Qingdao Yunlu Energy Technology Company Ltd | And 5 more authors.
International Journal of Minerals, Metallurgy and Materials | Year: 2014

The corrosion behavior and microstructure of Fe78Si9B13 glassy alloy in NaOH and NaCl solutions under a 0.02-T magnetic field were investigated through electrochemical testing and scanning electron microscopy (SEM). The current-density prepeak (PP) in the anodic polarization curves in low-concentration NaOH solutions (classified as type I) tends to disappear when the NaOH concentration is increased to 0.4 mol/L and the magnetic field is applied. Under the magnetic field, the height of the second current-density peak is increased in low-concentration NaOH solutions (type I) but decreased in high-concentration NaOH solutions (type II). The non-monotonic effect of the magnetic field was similarly observed in the case of polarization curves of samples measured in NaCl solutions. Ring-like corroded patterns and round pits are easily formed under the magnetic field in NaOH and NaCl solutions. These experimental results were discussed in terms of the magnetohydrodynamic (MHD) effect. © 2014, University of Science and Technology Beijing and Springer-Verlag Berlin Heidelberg. Source

Ye S.,Shandong University | Li X.,Qingdao Yunlu Energy Technology Company Ltd | Bian X.,Shandong University | Wang W.,Shandong University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2013

The microstructures of Fe78Si9B13 ingots including the primary master alloy (PMA) and secondary melted alloy (SMA), as well as the precipitates in the annealed amorphous ribbons spun from PMA and SMA ingots have been investigated. The presented data show that SMA ingot performances a better glass forming ability (GFA) than PMA ingot, indicating that remelting treatment can improve the GFA of Fe78Si 9B13 alloy. The metastable Fe23B6 phase forms in SMA ribbons after annealing at 600 °C and 700 °C. The lattice parameter a0 of α-Fe in the annealed SMA ribbons is higher than that in the annealed PMA ribbons, similar to the higher a 0 of α-Fe in SMA ingot than that in PMA ingot. The variation of lattice parameter a0 of α-Fe in the present ingots and annealed ribbons shows a heredity phenomenon, which is closely associated with the Fe23B6 structural units (distorted tri-capped trigonal prism clusters) in the melts. © 2013 Elsevier B.V. All rights reserved. Source

Meng L.L.,Shandong University | Li X.Y.,Qingdao Yunlu Energy Technology Company Ltd | Pang J.,Qingdao Yunlu Energy Technology Company Ltd | Wang L.,Shandong University | And 4 more authors.
Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science | Year: 2013

The precipitates, magnetism, and corrosion resistance of Fe 78Si9B13 glassy samples fabricated in vacuum and air atmospheres (labeled as VAC and AIR samples, respectively) were studied. The findings show that the fraction of the amorphous phase in VAC samples is lower than that in the AIR counterparts. The Fe phase in VAC samples grows preferentially along the 200 orientation. The distribution of magnetization M 4000 of VAC samples oriented parallel and orthogonal to the field (H // and H ⊥) at H = 4000 Oe is more scattered than AIR samples. The corrosion resistance of VAC samples is lower than AIR counterparts, which can be attributed to the minor alloying effect of oxygen and the passive effect of silicon atoms supplied from the amorphous phase. © 2013 The Minerals, Metals & Materials Society and ASM International. Source

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