CRYOGENIC RESISTIVITIES OF NbTiAlVTaLa_x, CoCrFeNiCu AND CoCrFeNiAl HIGH ENTROPY ALLOYS

In the paper, NbTiAlVTaLa_x (molar ratio, x=0, 0.1, 0.2) high entropy alloys were prepared by arc melting mixtures of the pure metal elements. The NbTiAlVTaLa_x alloys are composed mainly of BCC solid solution, and have a typical cast dendritic microstructure. The cryogenic resistivities of NbTiAlVTaLa_x, CoCrFeNiCu and CoCrFeNiAl high entropy alloys had been investigated. With the increase of La addition, the resistivities of NbTiAlVTaLa_x alloys increase. With the temperature increasing, the resistivity of CoCrFeNiCu alloy decreases, while that of CoCrFeNiAl alloy increases.