A High-Entropy B2 Heusler Alloy

Abstract

AbstractThe properties of high-entropy alloys containing five or more elements show systematic evolutions with varying valence-electron concentration. This can allow them to be tailored to carry a particular feature or a property. We have prepared a six-component alloy (MnFeCoNiCu)$$_{75}$$ 75 Al$$_{25}$$ 25 , where MnFeCoNiCu makes up the high-entropy part with $$e/a=9.0$$ e / a = 9.0 and the added 25 at.% Al causes the whole of the material to take up a B2-ordered structure with $$e/a=7.5$$ e / a = 7.5 . Because the structure becomes ordered, the material partially loses its high-entropy character but acquires a ferromagnetic Heusler-like property with a Curie temperature of 525 K and an average magnetic moment of 0.8 $$\upmu _{\text {B}}$$ μ B . The whole of the system mimics Co$$_3$$ 3 Al, which cannot be stabilized under normal conditions.