Nanocrystalline CoCrFeNiMn high-entropy alloy with tunable ferromagnetic properties

doi:10.1016/j.jmst.2020.10.060

Abstract

Abstract:

A nanocrystalline CoCrFeNiMn high-entropy alloy (nc-HEA) with nano-multiphase structure was prepared by inert gas condensation (IGC) using a laser evaporation source. Encouragingly, the laser-IGC nc-HEA exhibits unexpected ferromagnetic behavior and the Curie temperature (T_c) increased nearly 10 times compared to any CoCrFeNiMn HEAs prepared by various other methods. In addition, the saturation magnetization (M_s) and T_c of the laser-IGC nc-HEA can be controlled via heat treatment, which is resulting from the formation and structural evolution of magnetic nanophases during annealing. This work widens the design toolbox for high-performance nc-HEAs based upon laser-IGC technique.

Key words: Magnetic, Nanocrystalline high-entropy alloy, Laser-Inert gas condensation, Microstructure

Junjie Wang, Shangshu Wu, Shu Fu, Sinan Liu, Zhiqiang Ren, Mengyang Yan, Shuangqin Chen, Si Lan, Horst Hahn, Tao Feng. Nanocrystalline CoCrFeNiMn high-entropy alloy with tunable ferromagnetic properties[J]. J. Mater. Sci. Technol., 2021, 77: 126-130.

Figures/Tables 6

Fig. 1. Schematic diagram of (a) IGC system and (b) laser preparation of nc-HEA powder in the preparation chamber.

Fig. 2. (a) Representative backscattered electron micrograph of as-cast HEA, (b) TEM image of the laser-IGC nc-HEAs.

Fig. 3. Magnetic properties of the as-cast and laser-IGC HEAs: (a) M-H curves measured at room temperature, (b) M-T curves at the temperature range of 4 K - 400 K.

Table 1. A summary of saturation magnetization (Ms) and Curie temperatures (Tc) of the as-cast and laser-IGC samples after annealing.

	As-cast	IGC 25 °C	IGC 100 °C	IGC 200 °C	IGC 300 °C	IGC 450 °C	IGC 500 °C	IGC 600 °C	IGC 1000 °C
M_s(emu/g)	2.7	15	15.9	21.2	29.4	13.7	9.3	5.9	4.6
T_c(K)	22	206	179	160	158	100	98	92	72

Fig. 4. (a, b) In situ synchrotron XRD patterns of the as-cast and laser-IGC sample at 25-950 ℃. (c) The Rietveld refinement results for the initial laser-IGC nc-HEA. (d) The normalized integration of hexagonal, BCC and Cr-rich peak at 25-800 ℃.

Fig. 5. (a) 3D atom probe analysis of the initial laser-IGC nc-HEA, precipitates highlighted by surface encompassing regions of NiCo (purple) and FeCo (blue). (b) Proximity histograms of Ni/Co and Fe/Co nanoprecipitates.

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