Mictomagnetism and suppressed thermal conduction of the prototype high-entropy alloy CrMnFeCoNi

doi:10.1016/j.jmst.2021.04.077

Abstract

Abstract:

High-entropy alloys are characteristic of extensive atomic occupational disorder on high-symmetric lattices, differing from traditional alloys. Here, we investigate the magnetic and thermal transport properties of the prototype face-centered-cubic high-entropy alloy CrMnFeCoNi by combining physical properties measurements and neutron scattering. Direct-current and alternating-current magnetizations measurements indicate a mictomagnetic behavior with coexisting antiferromagnetic and ferromagnetic interactions below room temperature and three anomalies are found at about 80, 40, and 20 K, which are related to the paramagnetic to antiferromagnetic transition, the antiferromagnetic to ferromagnetic transition, and the spin freezing, respectively. The electrical and thermal conductivities are significantly reduced compared to Ni, and the temperature dependence of lattice thermal conductivity exhibits a glass-like plateau. Inelastic neutron scattering measurements suggest weak anharmonicity so that the thermal transport is expected to be dominated by the defect scattering.

Key words: High-entropy alloys, Magnetism, Inelastic neutron scattering, Lattice dynamics, Thermal conductivity

Yang Jianyan, Ren Weijun, Zhao Xinguo, Kikuchi Tatsuya, Miao Ping, Nakajima Kenji, Li Bing, Zhang Zhidong. Mictomagnetism and suppressed thermal conduction of the prototype high-entropy alloy CrMnFeCoNi[J]. J. Mater. Sci. Technol., 2022, 99: 55-60.

Figures/Tables 5

Fig. 1. Room temperature XRD and NPD patterns of CrMnFeCoNi. The inset shows the actual composition. The peak marked by an asterisk might be attributed to impurity.

Fig. 2. The DC magnetization (M) of CrMnFeCoNi under different magnetic fields, (a) 0.01, (b) 0.05, (c) 0.1, (d) 0.5, (e) 1, and (f) 3 T. Insets show dM/dT around 40 K. TN, Tt, and Tf are labeled, which are defined as the position of the peak around 80 K, the position of the extreme value of dM/dT around 40 K, and the peak position of the ZFC curves near 20 K, respectively.

Fig. 3. (a) The temperature dependencies of ac magnetic susceptibility under varying frequency. (b) Magnetic-field dependencies of DC magnetizations at different temperatures. The inset highlights the low-field regions.

Fig. 4. (a) The temperature dependencies of thermal conductivity of CrMnFeCoNi and Ni. The inset shows the high-temperature thermal conductivity of CrMnFeCoNi. (b) The temperature dependencies of the low-temperature total, electronic, and lattice thermal conductivity of CrMnFeCoNi as well as electrical resistivity (ρ).

Fig. 5. Inelastic neutron scattering. (a, b) The S(Q, E) contour plots of CrMnFeCoNi at 6 and 300 K; (c) the S(Q, E) contour plot of Ni at 300 K. (d) the sliced spectra at 6 ≤ |Q| ≤ 10 Å-1.

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