Effect of Carbon Addition on Crystallization Behavior and Soft Magnetic Performance of Fe-Si-B-P-Cu-C Alloys

초록

Fe85-xSi2B8P4Cu1Cx (x = 0, 1, 2, 3, and 4 at.%) NANOMET-type alloys were synthesized to investigate the role of carbon in tailoring the structural and magnetic properties of Fe-based soft magnetic materials. Amorphous ribbons were fabricated via melt spinning and thermally annealed to induce nanocrystallization. X-ray diffraction confirmed the formation of alpha-Fe nanocrystals with 22-26 nm grain sizes. Post-annealing magnetic measurements showed high saturation magnetization up to 1.89 T. Nanoindentation results indicated improved mechanical hardness with increasing carbon content. These findings demonstrate that carbon is an effective stabilizer and performance enhancer by refining microstructure and suppressing undesirable phase formation. The proposed alloy system offers a promising route toward high-performance, cost-effective soft magnetic materials for power electronics and high-frequency applications.

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