4.7 Article

Effect of Zr/B ratio on β relaxation, structural heterogeneity, and magnetic properties of Fe-Zr-B amorphous alloys

Journal

JOURNAL OF NON-CRYSTALLINE SOLIDS
Volume 594, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.jnoncrysol.2022.121822

Keywords

Amorphous alloys; Magnetic properties; beta relaxation; Structural heterogeneity

Funding

  1. National Natural Science Foundation of China [51571115]
  2. Priority Academic Program Development of Jiangsu Higher Education Institutions

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Studies have shown that beta relaxation and structural heterogeneity in Fe-Zr-B amorphous alloys have a significant impact on soft magnetic properties, with an increase in Zr/B ratio leading to a decrease in the ratio of beta to alpha relaxation temperature and correlation length. Alloys with easily activated beta relaxation or more heterogeneous structure exhibit poorer soft magnetic properties, including a reduction in saturation magnetic flux density and an increase in coercivity.
Dynamic relaxation is an universal feature in amorphous alloys. However, few studies have been conducted on beta relaxation of Fe-based amorphous alloys as most of them have insignificant beta relaxation characteristics. In this work, the variation in relaxation, structural heterogeneity, and soft magnetic properties are investigated in Fe-Zr-B amorphous alloys with pronounced beta relaxation. beta relaxation and structural heterogeneity are characterized by the ratio of beta and alpha relaxation temperature (i.e., T-beta/T-alpha) and correlation length, respectively. With the increase of Zr/B ratio, the value of T-beta/T-alpha and the correlation length tend to decrease. Alloys with easily activated beta relaxation or more heterogeneous structure possess poor soft magnetic properties, i.e., a significant reduction in saturation magnetic flux density and an increase in coercivity.

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