Near-constant resistivity in 4.2-360 K in a B2 Al2.08CoCrFeNi

Abstract

Near-constant electrical resistivity over 4.2 to 360 K in a pseudo-B2 Al2.08CoCrFeNi is reported. Absolute values of coefficients in electrical resistivity equation as a function of temperature, ρ(T) = ρ0 + Aln(T) + BT2 + CT3 + DT, decrease as temperature rises, manifesting that they gradually become less while temperature increases. Overall average temperature coefficient of resistivity (TCR) in 4.2 to 360 K is 72 ppm/K, with a half-parabolic shape in its resistivity-temperature curve that is similar to Manganin. It shows that the phonon effect on this alloy keeps nearly the same through this temperature range

Physical Properties of High Entropy Alloys

“…As-cast high entropy alloy typically have electrical resistivities between 100 and 220 μΩ-cm [27,28]. These values are 1-2 orders of magnitude higher than that of many conventional metals, and are similar to that of bulk metallic glasses (BMG).…”

“…Some alloys, such as Al 2.08 CoCrFeNi, have extremely small TCR. The average TCR of Al 2.08 CoCrFeNi from 4.2 to 360 K is only 72 ppm/K [27], compared with several thousand ppm/K for most pure metals. The low TCR value spanning such wide temperature range enables it to be used as precision resistors in special applications.…”

High-Entropy Alloys: A Critical Review

“…For example, HEAs can be used as hydrogen storage materials, [143,144] radiation resistant materials, [145] diffusion barriers for electronics, [22,23] precision resistors, [4,146] electromagnetic shielding materials, soft magnetic materials, [147] thermoelectric materials, functional coatings, and anti-bacterial materials. Because of the distinct design strategy and unique properties, HEAs and other high-entropy materials (e.g.…”

Structure of the High-Entropy CrMnFeCoNi and CrMnFeCoNi$_{2}$Cu Alloys and Thermal Stability of Its Electrical Transport Properties

“…ВЕСи характеризуються порівняно низь-кою теплопровідністю [4,6]. Ці стопи виявляють низку особливос-тей і в електротранспортних властивостях [5][6][7]. Зокрема, відміча-ється, що вони мають значні величини питомого електроопору  при порівняно малій величині термічного коефіцієнту опору  (ТКО), що ставить їх поряд з аморфними стопами і робить перспек-тивними для використання як резистивних елементів [7].…”