Mechanistic Investigation of β Relaxation and Its Influence on the Magnetic and Mechanical Properties of Novel Amorphous Alloys

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Abstract
This study presents a systematic comparative investigation of the soft magnetic properties, mechanical performance, and structural relaxation characteristics of two Fe-based amorphous ribbons, Fe₈₀Si₉B₁₁ and Fe₈₀Co₃Si₃B₁₀P₁C₃, subjected to heat treatment. Differential scanning calorimetry, X-ray diffraction, coercivity measurements, plate-bending evaluation, tensile tests, microhardness testing, and dynamic mechanical analysis are employed to elucidate the effect of elemental composition on thermal stability, brittle-to-ductile transition behavior, and relaxation kinetics of these amorphous systems. The results show that the β-relaxation peak in Fe₈₀Si₉B₁₁ is completely merged into the primary α-relaxation peak, whereas Fe₈₀Co₃Si₃B₁₀P₁C₃ exhibits a distinct β-relaxation peak at approximately 215 °C. The pronounced β-relaxation behavior of Fe₈₀Co₃Si₃B₁₀P₁C₃ contributes to superior bending toughness following heat treatment. In contrast, the weak β-relaxation response of Fe80Si9B11 results in a greater susceptibility to embrittlement. Furthermore, it is demonstrated that the evolution of microhardness can partially reflect the β-relaxation characteristics in amorphous ribbons.

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