3d transition-metal high-entropy Invar alloy developed by adjusting the valence-electron concentration

Rao, Z. and Cąklr, A. and Özgün, Ö. and Ponge, D. and Raabe, D. and Li, Z. and Acet, M.

Volume: 5 Pages:
DOI: 10.1103/PhysRevMaterials.5.044406
Published: 2021

By considering the valence-electron concentration of 3d transition-metal alloys and compounds, we develop 3d high-entropy alloy Mn12.1Fe34.2Co33.5Ni12.3Cu7.9 with 8.7 electrons per atom, which is identical to that of Fe65Ni35 Invar. We carry out X-ray diffraction, scanning electron microscopy, magnetization, thermal expansion, and elastic modulus measurements, by which we show that the HEA alloy indeed carries Invar properties. This is evidenced particularly by the observed spontaneous volume magnetostriction and the lattice softening covering a broad temperature-range around the ferromagnetic Curie temperature. © 2021 American Physical Society.

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