A Novel CoFe2NiMn0.3AlCux High-Entropy Alloy with Excellent Magnetic Properties and Good Mechanical Properties

doi:10.1007/s40195-021-01256-8

Abstract

Abstract:

In the present study, we investigate the crystal structure of high-entropy alloys (HEAs) in the form of CoFe₂NiMn_0.3AlCu_x (x = 0.25, 0.50, 0.75, and 1.00) and their mechanical and magnetic properties. The CoFe₂NiMn_0.3AlCu_x alloys are composed of a mixture of a body-centered cubic (BCC) and a face-centered cubic (FCC) solid solution. The increased amounts of copper (Cu) boost both alloy strength and plastic ductility. The CoFe₂NiMn_0.3AlCu_1.0 HEAs demonstrate excellent mechanical properties, such as a high strength of 1832 MPa and a large plastic ductility of 22.38%. Magnetic property measurements on this alloy system indicated high saturated magnetization and high coercivity. The coercivity of the tested alloys lies in the range between 40 and 182 Oe, suggesting that the alloys have semi-hard magnetic properties. This study suggests that the present CoFe₂NiMn_0.3AlCu_x HEAs could serve as potential candidates for soft magnets in electromagnetic applications.

Key words: High-entropy alloy, Microstructure, Magnetic properties, Mechanical properties

Man Zhu, Chi Zhang, Kun Li, Yongqin Liu, Mao Zhang, Lijuan Yao, Zengyun Jian. A Novel CoFe₂NiMn_0.3AlCu_x High-Entropy Alloy with Excellent Magnetic Properties and Good Mechanical Properties[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(11): 1557-1564.

Figures/Tables 9

References 41

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Alloys	Region	Co	Fe	Ni	Mn	Al	Cu
Cu0.25	Nominal	18.02	36.04	18.02	5.41	18.02	4.49
	BCC phase	18.52	34.23	18.18	5.96	18.45	4.66
	FCC phase	17.06	31.14	17.62	6.25	20.66	7.27
Cu0.50	Nominal	17.24	34.48	17.24	5.17	17.25	8.62
	BCC phase	16.83	30.86	17.28	5.84	20.54	8.65
	FCC phase	17.36	32.14	17.49	5.88	18.66	8.47
Cu0.75	Nominal	16.53	33.06	16.53	4.96	16.53	12.39
	BCC phase	17.33	32.75	16.10	5.36	17.98	10.48
	FCC phase	14.67	27.80	17.36	6.37	16.49	17.31
Cu1.00	Nominal	15.87	31.76	15.87	4.76	15.87	15.87
	BCC phase	15.91	30.58	14.84	5.04	19.87	13.76
	FCC phase	13.09	24.40	15.56	6.00	15.99	24.96

Alloys	Region	Co	Fe	Ni	Mn	Al	Cu
Cu0.25	Nominal	18.02	36.04	18.02	5.41	18.02	4.49
	BCC phase	18.52	34.23	18.18	5.96	18.45	4.66
	FCC phase	17.06	31.14	17.62	6.25	20.66	7.27
Cu0.50	Nominal	17.24	34.48	17.24	5.17	17.25	8.62
	BCC phase	16.83	30.86	17.28	5.84	20.54	8.65
	FCC phase	17.36	32.14	17.49	5.88	18.66	8.47
Cu0.75	Nominal	16.53	33.06	16.53	4.96	16.53	12.39
	BCC phase	17.33	32.75	16.10	5.36	17.98	10.48
	FCC phase	14.67	27.80	17.36	6.37	16.49	17.31
Cu1.00	Nominal	15.87	31.76	15.87	4.76	15.87	15.87
	BCC phase	15.91	30.58	14.84	5.04	19.87	13.76
	FCC phase	13.09	24.40	15.56	6.00	15.99	24.96

Elements (Atomic radii)	Fe	Co	Ni	Mn	Al	Cu
Fe (0.1241 nm)	-	- 1	- 2	0	- 11	+ 13
Co (0.1251 mm)	- 1	-	0	- 5	- 19	+ 6
Ni (0.1246 nm)	- 2	0	-	- 8	- 22	+ 4
Mn (0.1350 nm)	0	- 5	- 8	-	- 19	+ 4
Al (0.1432 nm)	- 11	- 19	- 22	- 19	-	- 1
Cu (0.1278 nm)	+ 13	+ 6	+ 4	+ 4	- 1	-

Elements (Atomic radii)	Fe	Co	Ni	Mn	Al	Cu
Fe (0.1241 nm)	-	- 1	- 2	0	- 11	+ 13
Co (0.1251 mm)	- 1	-	0	- 5	- 19	+ 6
Ni (0.1246 nm)	- 2	0	-	- 8	- 22	+ 4
Mn (0.1350 nm)	0	- 5	- 8	-	- 19	+ 4
Al (0.1432 nm)	- 11	- 19	- 22	- 19	-	- 1
Cu (0.1278 nm)	+ 13	+ 6	+ 4	+ 4	- 1	-

Alloys	ΔH_mix (kJ·mol^-1)	ΔS_mix (J·K^-1·mol^-1)	Ω	δ (%)	VEC
Cu0.25	- 9.03	13.23	2.34	5.08	7.72
Cu0.50	- 7.19	13.64	3.00	4.97	7.86
Cu0.75	- 5.62	13.85	3.88	4.88	7.99
Cu1.00	- 4.27	13.95	5.11	4.78	8.11

A Novel CoFe₂NiMn_0.3AlCu_x High-Entropy Alloy with Excellent Magnetic Properties and Good Mechanical Properties

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References 41

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Alloys	σ_0.2 (MPa)	σ_f (MPa)	ε_y (%)	HV
Cu0.25	-	675	4.58	647
Cu0.50	-	1058	6.04	637
Cu0.75	-	1811	9.15	595
Cu1.00	1048	1832	22.38	408

Alloys	Structure	Ms (emu/g)	Hc (Oe)	Ref.
CoFe₂NiMn_0.3AlCu_0.25	BCC + FCC	130	182	Present study
CoFe₂NiMn_0.3AlCu_0.50	BCC + FCC	122	158	Present study
CoFe₂NiMn_0.3AlCu_0.75	BCC + FCC	112	103	Present study
CoFe₂NiMn_0.3AlCu_1.00	BCC + FCC	74	40	Present study
FeCoNi	FCC	151	1.52	[37]
FeCoNiCr_0.2Si_0.2	FCC	98.11	2.36	[16]
CoCuFeMnNi	FCC	84	6	[23]
CoCr_2.0CuFeMnNi	BCC + FCC	25	75	[23]
AlCoCuFeNi_0.5	BCC + FCC + B2	89.21	7.3	[38]
AlCoCrFeNi	BCC	64.71	52	[22]
AlCoCrFeNb_0.25Ni	BCC + Laves	34.69	94	[22]
AlNiCoCuFe	BCC + FCC	84	162	[39]

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