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The Effect of Magnetic Field Heat Treatment on Soft Magnetic Properties of Fe82.9Si4.2B12.3C0.6 Amorphous Alloy

Ebadi, Mohammad Ali | 2024

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57219 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Madaah Hosseini, Hamid Reza
  7. Abstract:
  8. Soft magnetic materials are widely used in industries such as automotive, electrical, electronics, and telecommunications. These materials are essential for electromotors, inductors, transformers, and generators. The introduction of FineMet soft magnetic alloy has been a significant development in the design and production of nanocrystalline soft magnetic materials, leading to extensive research on these types of alloys. This particular study investigates the impact of applying an external magnetic field on the magnetic properties of Fe82.9Si4.2B12.3C0.6 amorphous alloy. The study begins by examining the kinetics of α-Fe phase crystallization using DSC. The results indicate that the nucleation activation energy of α-Fe is 376 kJ/mol, while the nucleation and growth activation energy of the phase is 367 kJ/mol. Given the significant influence of growth control on nanocrystallization and grain size distribution in these alloys, the study explores the effect of applying an external magnetic field during the nanocrystallization process. To investigate this, various samples are prepared by heat treating for different durations at temperatures of 480, 490, 520, and 540 degrees Celsius. These samples are created under two conditions: without applying an external magnetic field and in the presence of an external magnetic field. XRD measurements reveal that the grain size ranges from 60 to 90 nm in the first group of samples, which decreases to 50 nm when an external magnetic field is applied during the heat treatment. VSM results demonstrate that the coercive force in samples prepared at 480, 490, 520, and 540 degrees Celsius for 5 minutes without applying an external magnetic field is 23, 133, and 152 Ampere per meter, respectively. However, applying an external magnetic field during the nanocrystallization process reduces the coercive force to 11, 8, and 30 A/m for the samples prepared at the same temperature and time. These findings highlight the significant impact of applying an external magnetic field during the heat treatment process, controlling the growth and reducing the grain size, which in turn lowers the magnetocrystalline anisotropy and enhances the magnetic softness of the material. Furthermore, increasing the crystalline phase volume fraction in the amorphous matrix enhances the saturation magnetization from 166 emu/g to 205 emu/g, significantly improving the functionality of these materials
  9. Keywords:
  10. Nanocrystalline Metals ; Magnetic Properties ; Phase Transformation ; Fe-Based Soft Magnetic Alloys ; Magnetic Field Annealing ; Nanocrystalline Soft Magnetic Materials ; Amorphous Alloys

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