Glass-Forming Ability and Crystallization Behavior of Mo-Added Fe<sub>82−x</sub>Si<sub>4</sub>B<sub>12</sub>Nb<sub>1</sub>Mo<sub>x</sub>Cu<sub>1</sub> (x = 0–2) Nanocrystalline Alloy
This study investigates the effects of molybdenum (Mo) additions on the crystallization behavior and soft magnetic properties and of Fe<sub>82-x</sub>Si<sub>4</sub>B<sub>12</sub>Nb<sub>1</sub>Mo<sub>x</sub>Cu<sub>1</sub> (x = 0–...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-07-01
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| Series: | Metals |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-4701/15/7/744 |
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| Summary: | This study investigates the effects of molybdenum (Mo) additions on the crystallization behavior and soft magnetic properties and of Fe<sub>82-x</sub>Si<sub>4</sub>B<sub>12</sub>Nb<sub>1</sub>Mo<sub>x</sub>Cu<sub>1</sub> (x = 0–2) nanocrystalline alloys. Molybdenum enhances glass-forming ability (GFA) and magnetic properties by increasing negative mixing enthalpy (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>∆</mo><msub><mrow><mi mathvariant="normal">H</mi></mrow><mrow><mi mathvariant="normal">m</mi><mi mathvariant="normal">i</mi><mi mathvariant="normal">x</mi></mrow></msub></mrow></semantics></math></inline-formula>), mixing entropy (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>∆</mo><msub><mrow><mi mathvariant="normal">S</mi></mrow><mrow><mi mathvariant="normal">m</mi><mi mathvariant="normal">i</mi><mi mathvariant="normal">x</mi></mrow></msub></mrow></semantics></math></inline-formula>), and atomic size mismatch (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mo>δ</mo></mrow></semantics></math></inline-formula>), which stabilize the amorphous phase. X-ray diffraction (XRD) analysis shows that Mo addition improves amorphous phase stability, further enhancing GFA. The simultaneous addition of Mo and Nb increases mixing entropy, promotes nucleation rates, and creates favorable conditions for optimizing nanocrystallization. Upon annealing, this optimized microstructure demonstrated low coercivity and high permeability. Notably, the Fe<sub>80</sub>Si<sub>4</sub>B<sub>12</sub>Nb<sub>1</sub>Mo<sub>2</sub>Cu<sub>1</sub> ribbon, annealed at 470 °C for 10 min, exhibited exceptional soft magnetic properties, with a coercivity of 4.54 A/m, a maximum relative permeability of 48,410, and a saturation magnetization of 175.24 emu/g. High-resolution transmission electron microscopy (TEM) revealed an average crystal size of 18.16 nm. These findings suggest that Fe<sub>82-x</sub>Si<sub>4</sub>B<sub>12</sub>Nb<sub>1</sub>Mo<sub>x</sub>Cu<sub>1</sub> (x = 0–2) nanocrystalline alloys are suitable for advanced electromagnetic applications pursuing miniaturization and high efficiency. |
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| ISSN: | 2075-4701 |