"Acta Physica Sinica": Effect of gadolinium content on the magnetic properties and oxidation mechanism of Fe-B-Nb-Gd amorphous alloy

Compared with traditional silicon steel, iron-based amorphous alloys have the advantages of high saturation magnetization, low iron loss and low coercive force, making them an ideal choice for soft magnetic materials. Iron-based amorphous alloys have attracted the attention of many researchers due to their excellent mechanical strength, high thermal stability and corrosion resistance. At present, iron-based amorphous alloys have been widely used in fields such as marine engineering and power electronics. However, with the deepening of engineering applications, further optimizing the amorphous formation ability and soft magnetic properties of iron-based alloys has become one of the main research directions. Heavy rare earth elements Gd and Dy can reduce the Curie temperature of iron-based metallic glass, increase magnetic entropy change and refrigeration capacity, and are suitable for the production of low-cost magnetic refrigeration materials. Of course, the addition of rare earth elements will also affect the amorphous oxidation performance. Rare earths have a strong affinity for oxygen and are therefore easily oxidized, which limits their applications. Studying the oxidation mechanism of rare earth-containing amorphous alloys plays an important guiding role in expanding their application scope.

Wei Bingbo and others from Northwestern Polytechnical University improved the amorphous formation ability of the ternary Fe73B22Nb5 alloy by adding Gd element. The effect of Gd element content on the thermal stability and room temperature magnetic properties of the alloy was clarified, and the mechanism of rare earth elements in the alloy oxidation process was systematically revealed, providing an optimization solution for the composition design of iron-based amorphous alloys. Relevant research results will be published online in Acta Physica Sinica in March 2024.

This work was funded by the National Key Research and Development Program, the National Natural Science Foundation and the Shaanxi Provincial Natural Science Foundation.

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