Effect of Al Content on Magnetic Properties and Thermal Expansion of As-Cast High-Entropy Alloys Al$_{x}$FeCoNiCuCr

Abstract

The high-entropy alloys (HEA) Al x FeCoNiCuCr (x  1.0, 1.5, 1.8) in cast state are investigated by means of X-ray diffraction, Mössbauer spectroscopy, magnetic and dilatometric methods. Two-phase state in the HEA and the increase of the crystal lattice parameter а of the f.c.c. and b.c.c. phases are detected. The decrease of the Curie temperature and the saturation magnetization upon deviation of Al content from equimolar composition are found out. Inhomogeneous magnetic order characterizes the studied HEA. For the studied HEA, the magnetic moment 0.2-0.4 B and the average thermal expansion coefficient <>  12.410 6 K 1 in the temperature range of 135-545 K are determined.

Creation and Mössbauer studies of high‐entropy physical vapor deposition by cathode arc evaporation (PVD CAE) coating AlFeCoNiCuCr

“…The presence of α‐phase as well as two γ 1 ‐ and γ 2 ‐phases in the as‐cast equimolar high‐entropy alloys indicates its heterogeneity upon chemical composition. Only growth in aluminum content (x > 1) in the Al x FeCoNiCuCr alloy ensures the formation of a single phase fcc structure, along with a bcc phase .…”

“…A solid solution–hardening mechanism was suggested, however other authors considered a NiAl intermetalic phase as a main high‐strength component in high‐entropy alloys . The as‐cast equimolar AlCoCrFeNiCu high‐entropy alloys displays typical ferromagnetic behavior with the low specific saturation magnetisation (at 300 K σ s ≈ 38–44 emu/g , 22–41 emu/g ).…”

Effect of Copper Addition on the AlCoCrFeNi High Entropy Alloys Properties via the Electroless Plating and Powder Metallurgy Technique

“…The Cu ). This fact means that the Cu x /(AlCoCrFeNi) 1 − x can be connected with steel items or deposited as coatings on their surfaces to increase hardening and wear resistance [70,71]. So, by increasing the nano Cu percentage, the quality of Cu coating of the different elements particles increases.…”

Properties of Invar alloy Fe‐30.9 % Ni‐1.23 % C after dispersion of structure by upsetting

“…It was shown in that carbon in Invar fcc Fe–Ni–C alloys plays an important role in both strengthening, stabilizing of austenitic phase and efficiently impacting on thermal expansion . These studies have shown that presence of carbon can substantially reduce the thermal expansion coefficient of austenitic Fe–Ni alloy at much lower concentration of nickel (29–31 wt%) and expand the temperature range of the Invar anomaly.…”