Y-Added FeCoNiSiB Amorphous Multi-Principal Alloys Demonstrate Enhanced Performance

High entropy alloys have emerged as a powerful materials platform, built from multiple principal elements in a single system. Among them, multi-principal element amorphous alloys (MPEAAs) offer an especially attractive combination: strong mechanical response, reliable wear and corrosion behavior, and soft magnetic performance that can remain stable at elevated temperatures. Yet one question has persisted for researchers working on these glassy metals—how do rare-earth (RE) additions reshape their internal structure and, in turn, their functional properties?

A new experimental study by Zhang and colleagues focuses on Yttrium (Y), a rare-earth element, added to a representative Fe–Co–Ni–Si–B metallic glass. The work investigates the transformation of a melt-spun (Fe1/3Co1/3Ni1/3)80Si6B14 amorphous alloy when Y is introduced, aiming to clarify how Y affects atomic arrangements that govern magnetism and thermal behavior.

To achieve this, the authors design a family of six-component, or senary, Fe–Co–Ni–Si–B–Y MPEAAs. Instead of tuning only composition, the study links Y incorporation to measurable outcomes such as saturation magnetization, thermal stability, and microhardness—three properties that often compete in advanced soft magnetic materials. The goal is to find compositions that resist structural relaxation while maintaining strong magnetic response.

Microstructural analysis reveals that adding Y can modify how the amorphous matrix stabilizes, reducing tendencies that would otherwise promote unwanted transformations during heating. This stabilization is crucial because amorphous soft magnetic alloys are intended to operate under real-world thermal cycling, where crystallization or phase evolution can degrade performance.

As a result, the Y-containing alloys exhibit exceptional thermal stability alongside enhanced microhardness. In practical terms, this suggests improved resistance to deformation and service wear, supporting longer component lifetimes and reduced maintenance requirements in demanding environments.

Magnetically, the reported compositions show high saturation magnetization and acceptable soft-magnetic characteristics. Soft magnetic behavior is essential for minimizing energy losses, which directly influences the efficiency of electromagnetic devices that rely on transformer cores.

Corrosion resistance is also improved to an acceptable level, addressing another barrier for deployment outside laboratory conditions. Materials for offshore and industrial systems must tolerate moisture, salinity, and aggressive atmospheres that accelerate degradation.

These findings point toward an important application pathway: the potential use of the (Fe1/3Co1/3Ni1/3)80Si6B14 family of amorphous alloys—now with Y optimization—as magnetic core materials in offshore wind power transformers. In offshore wind infrastructure, where efficiency and durability are critical, refined soft magnetic alloys could help improve energy conversion while extending service life.

Keywords

Chemistry