Composition and phase structure dependence of mechanical and magnetic properties for AlCoCuFeNix high entropy alloys

doi:10.1016/j.jmst.2018.12.014

Abstract

Abstract:

In this study, the effects of composition and phase constitution on the mechanical properties and magnetic performance of AlCoCuFeNi_x (x = 0.5, 0.8, 1.0, 1.5, 2.0, 3.0 in molar ratio) high entropy alloys (HEAs) were investigated. The results show that Ni element could lead to the evolution from face centered cubic (FCC), body centered cubic (BCC) and ordered BCC coexisting phase structure to a single FCC phase. The change of phase constitution enhances the plasticity but reduces the hardness and strength. One of the interesting points is the excellent soft magnetic properties of AlCoCuFeNi_x HEAs. Soft magnetic performance is dependent on composition and phase transition. AlCoCuFeNi_1.5 alloy, achieving a better balance of mechanical and magnetic properties, could be applied as structure materials and soft magnetic materials (SMMs). High Curie temperature (>900 K) and strong phase stability below 1350 K of AlCoCuFeNi_0.5 alloy confirm its practicability in a high-temperature environment. Atomic size difference (δ) is utilized as the critical parameter to explain the lattice strain and phase transformation induced by Ni addition.

Key words: High entropy alloy, Phase transformation, Mechanical property, Soft magnetic performance, Atomic size difference

Cong Liu, Wenyi Peng, C.S. Jiang, Hongmin Guo, Jun Tao, Xiaohua Deng, Zhaoxia Chen. Composition and phase structure dependence of mechanical and magnetic properties for AlCoCuFeNi_x high entropy alloys[J]. J. Mater. Sci. Technol., 2019, 35(6): 1175-1183.

Figures/Tables 19

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Alloy	I_(110)B/I_(111)F	Lattice constants (nm)
		FCC	BCC
Ni0.5	3.16	0.3641	0.2885
Ni0.8	2.91	0.3630	0.2882
Ni1.0	0.94	0.3624	0.2878
Ni1.5	0.65	0.3612	0.2874
Ni2.0	-	0.3596	-
Ni3.0	-	0.3599	-

Alloy	I_(110)B/I_(111)F	Lattice constants (nm)
		FCC	BCC
Ni0.5	3.16	0.3641	0.2885
Ni0.8	2.91	0.3630	0.2882
Ni1.0	0.94	0.3624	0.2878
Ni1.5	0.65	0.3612	0.2874
Ni2.0	-	0.3596	-
Ni3.0	-	0.3599	-

Alloys	Regions in Fig. 2	Al	Co	Cu	Fe	Ni
Ni3.0	Nominal	14.29	14.29	14.29	14.29	42.84
	FCC	14.73	14.95	13.65	14.42	42.25
	BCC	-	-	-	-	-

Alloys	Regions in Fig. 2	Al	Co	Cu	Fe	Ni
Ni3.0	Nominal	14.29	14.29	14.29	14.29	42.84
	FCC	14.73	14.95	13.65	14.42	42.25
	BCC	-	-	-	-	-

Alloys	Phase Structure	σ_0.2 (MPa)	σ_max (MPa)	ε_f (%)	Hardness (HV)	M_s (emu/g)	H_C (Oe)	Remanence ratio (M_r/M_s) (%)
Ni0.5	BCC + FCC + B2	929	1231	13.7	430.9	89.21	7.30	0.55
Ni0.8	BCC + FCC + B2	1021	1465	12.3	420.0	83.92	3.77	0.29
Ni1.0	FCC + BCC + B2	994	1609	24.5	391.4	73.73	5.81	0.37
Ni1.5	FCC + BCC + B2	680	1725	35.9	323.8	63.58	13.70	1.40
Ni2.0	FCC + BCC + B2	544	-	-	299.2	57.43	11.12	0.94
Ni3.0	FCC	268	-	-	279.6	54.68	24.81	9.35