Mechanical, corrosion and magnetic behavior of a CoFeMn1.2NiGa0.8 high entropy alloy

doi:10.1016/j.jmst.2020.08.062

Abstract

Abstract:

In this study, a magnetic high entropy alloy (HEA) of CoFeMn_1.2NiGa_0.8 was designed and prepared by arc melting in order to investigate its mechanical, corrosion and magnetic behavior. The results show that the alloy mainly possesses body-centered cubic (BCC) phase and face-centered cubic (FCC) phase. A high compressive strength of 1450 MPa, a strain of 18.5 % and a relatively low yield strength of 303 MPa in as-cast condition at room temperature can be achieved in the present alloy. In-situ high-energy X-ray diffraction technique was employed to reveal the deformation mechanism of CoFeMn_1.2NiGa_0.8 under uniaxial compression and the results show that the competition between BCC phase and FCC phase plays a significant role during the compressive process. The corrosion behavior of CoFeMn_1.2NiGa_0.8 was investigated in 3.5 wt% NaCl solution and it turned out that the alloy possessed good corrosion resistance. At last, the magnetic behavior of the CoFeMn_1.2NiGa_0.8 alloy was studied and it can present a high saturation magnetization of 94.5 emu/g and a coercivity of 26.4 Oe at 4 K. This work indicates that the present CoFeMn_1.2NiGa_0.8 HEA has promising applications as future magnetic functional materials.

Key words: High entropy alloys, High-energy X-ray diffraction, Compressive property, Corrosion resistance, Magnetic behavior

Xiaoming Sun, Lingzhong Du, Hao Lan, Jingyi Cui, Liang Wang, Runguang Li, Zhiang Liu, Junpeng Liu, Weigang Zhang. Mechanical, corrosion and magnetic behavior of a CoFeMn_1.2NiGa_0.8 high entropy alloy[J]. J. Mater. Sci. Technol., 2021, 73: 139-144.

Figures/Tables 9

Fig. 1. (a) SEM micrograph and (b) TEM image with the corresponding SAED patterns of the CoFeMn1.2NiGa0.8 alloy.

Table 1 Chemical composition (at%) of the CoFeMn1.2NiGa0.8 alloy.

Elements	Co	Fe	Mn	Ni	Ga
Nominal	20	20	24	20	16
Present	19.34	18.99	24.32	20.16	17.19

Fig. 2. One-D HEXRD profile of the CoFeMn1.2NiGa0.8 alloy at room temperature.

Fig. 3. The nominal uniaxial compression stress-strain curve of CoFeMn1.2NiGa0.8 at different temperatures.

Fig. 4. (a) 1-D HE-XRD profiles evolution of F(111), B(110) and B(211) under stress by integrating the 2-D diffraction patterns of the 2θ range from 3? to 3.2? and 5.35? to 5.65?. (b) Response of lattice strains to compressive stress of the F{111}, B{110} and B{211} phases in CoFeMn1.2NiGa0.8. (c) The change in FWHMs for F(111), B(110) and B(211) peaks as a function of uniaxial compression in CoFeMn1.2NiGa0.8.

Fig. 5. (a) Corrosion tests of the CoFeMn1.2NiGa0.8 alloy and steel in 3.5 wt% NaCl solution at 308 K. (b) SEM micrograph of CoFeMn1.2NiGa0.8 after corrosion. (c) Enlarged views of filed in the frame in (b). (d) EDS analysis of (c).

Table 2 Electrochemical parameters derived from polarization curves of CoFeMn1.2NiGa0.8 and 304 stainless steel in 3.5 wt% NaCl solution.

Alloys	E_corr(V_SCE)	I_corr(A cm^-2)	E_p(V_SCE)
CoFeMn_1.2NiGa_0.8	-0.416	1.11 × 10^-3	0.79
304 stainless steel	-0.489	1.37 × 10^-3	0.22

Fig. 6. (a) Magnetic hysteresis loops of CoFeMn1.2NiGa0.8 at 297 K and 4 K. The inset of (a) is the coercivity of CoFeMn1.2NiGa0.8. (b) The DSC curve of CoFeMn1.2NiGa0.8 recorded between 300 K and 750 K.

Fig. 7. Scatter plot of the magnetic properties for CoFeMn1.2NiGa0.8 and some reported magnetic HEAs.

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