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Amorphous alloys have become a research hotpot in the field of materials physics due to their unique long-range disordered structure and excellent physical properties. However, the complex microstructural evolution and electronic transport mechanisms of amorphous alloys under thermal effects still require in-depth investigation. In this work, Ni40Fe35B15Si7P3 and Ni50Fe25B15Si7P3 amorphous alloy ribbons were prepared by the melt-spinning technique, and the as-cast samples were subjected to annealing treatments within the supercooled liquid region. The results show that annealing within the supercooled liquid region enhances the short-range order, reduces the free volume, and increases the atomic packing density of the alloys. The volume fraction of the local quasi-crystalline clusters in the annealed samples increased to 26%-34%. Furthermore, the increases in scattering centers and the release of internal stresses induced by the supercooled liquid region annealing lead to an increase in the electrical resistivity of the alloys. Specifically, the resistivity of the Ni40Fe35B15Si7P3 alloy increased from 131.8 μΩ·cm to 217.0 μΩ·cm, a 64.6% increase. Under an applied magnetic field, the deflection of electron trajectories due to the Lorentz force and the magnetostriction effect further increase the resistivity of the alloys. Additionally, thermal activation releases the bound electrons and enhances their scattering, resulting in an increase in the carrier concentration and a decrease in the carrier mobility of the annealed alloys. This study demonstrates that annealing can effectively control the short-range order and free volume distribution of amorphous alloys, thereby influencing their electronic transport properties. The findings provide an experimental basis for the design of high-performance amorphous alloy electronic devices.
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Keywords:
- Ni-Fe-based amorphous alloys /
- annealing /
- short-range order /
- electrical properties
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