Microstructure and Mechanical Behavior of CrFeNi2V0.5Wx (x = 0, 0.25) High-Entropy Alloys

doi:10.1007/s40195-020-01029-9

Abstract

Abstract:

CrFeNi₂V_0.5W_x (x = 0, 0.25) alloys based on these parameters of mixing enthalpy (ΔH_mix), mixing entropy (ΔS_mix), atomic radius difference (δ), valance electron concentration, and electronegativity difference(Δχ) were designed and prepared. The microstructure and room-temperature mechanical behavior of both alloys were investigated. Compressive test results showed that the CrFeNi₂V_0.5W_0.25 alloy had higher yield strength than that of the W-free CrFeNi₂V_0.5 alloy, although they all exhibited quite larger compressive plasticity (ε > 70%). Compression fracture surface of CrFeNi₂V_0.5W_0.25 alloy revealed a ductile fracture in the face-centered cubic (FCC) phase and a brittle-like fracture in the σ phase. Moreover, tensile test results indicated that the CrFeNi₂V_0.5W_0.25 alloy exhibited excellent mechanical property with an ultimate tensile strength of 640 MPa and a high tensile elongation of 15.7%. The tensile deformation mode of the FCC phase in the CrFeNi₂V_0.5W_0.25 alloy is dominated by planar glide, relating to dislocation configurations, high-density dislocations, and dislocation wall. Therefore, dislocation slip plays a significant role in tensile deformation of CrFeNi₂V_0.5W_0.25 high-entropy alloy. The higher strength of CrFeNi₂V_0.5W_0.25 alloy is predominantly due to the solid solution strengthening of W element and σ phase precipitation strengthening. Combination of the higher tensile strength and plasticity suggests that the CrFeNi₂V_0.5W_0.25 alloy can be a promising aerospace material.

Key words: High-entropy alloy, Microstructure, Mechanical property, Deformation behavior

Hui Jiang, Tian-Dang Huang, Chao Su, Hong-Bin Zhang, Kai-Ming Han, Sheng-Xue Qin. Microstructure and Mechanical Behavior of CrFeNi₂V_0.5W_x (x = 0, 0.25) High-Entropy Alloys[J]. Acta Metallurgica Sinica (English Letters), 2020, 33(8): 1117-1123.

Figures/Tables 10

Table 1 Atomic radius (r), valence electron concentration (VEC), melting temperature (Tm) of the constituent elements for studied alloys

Elements	Atomic radius (pm)	VEC	T_m (K)
W	137	6	3683
Ni	124	10	1728
Fe	126	8	1808
Cr	125	6	2180
V	134	5	2183

Table 2 Calculated parameters δ, ΔHmix, ΔSmix, Ω, VEC, and Δχ for CrFeNi2V0.5 and CrFeNi2V0.5W0.25 alloys

Alloys	Parameters
Alloys	δ	∆H_mix (kJ/mol)	ΔS_mix (J/(k mol))	Ω	VEC	Δχ
CrFeNi₂V_0.5	2.448	- 8.2	10.58	2.448	8.11	0.115
CrFeNi₂V_0.5W_0.25	3.397	- 7.6	11.74	3.076	8	0.173

Fig. 1 XRD patterns of CrFeNi2V0.5 and CrFeNi2V0.5W0.25 alloys

Fig. 2 a Microstructure of the CrFeNi2V0.5 alloy; b SEM backscattered electron image of the CrFeNi2V0.5W0.25 alloy; c TEM-SAED corresponding to the FCC phases

Table 3 Chemical compositions of the CrFeNi2V0.5 and CrFeNi2V0.5W0.25 alloys

Alloy	Regions	Element
Alloy		Ni	Fe	Cr	V	W
CrFeNi₂V_0.5		Nominal	44.44	22.22	22.22	11.12
CrFeNi₂V_0.5	44.29	Nominal	22.56	21.90	11.25
CrFeNi₂V_0.5W_0.25	Nominal	42.11	21.05	21.05	10.53	5.26
	DR	43.46	21.34	20.20	9.54	5.36
	ID	27.00	18.30	28.81	14.48	11.40

Fig. 3 Engineering stress-strain curves of CrFeNi2V0.5 and CrFeNi2V0.5W0.25 alloys. The inset is profile of the compressed specimen

Fig. 4 a Metallographic structure, b, c SEM backscattered images of the CrFeNi2V0.5W0.25 alloy sample after 70% compression deformation

Fig. 5 a Tensile stress-strain curve for CrFeNi2V0.5W0.25 alloy. The inset shows the tensile test specimen. b Tensile properties of CrFeNi2V0.5W0.25 alloy, FCC solid solution HEAs and FCC-based HEAs [19, 38,39,40]

Fig. 6 Fracture surface morphologies of the CrFeNi2V0.5W0.25 alloy: a low magnification; b high magnification

Fig. 7 Bright-field TEM images of the CrFeNi2V0.5W0.25 alloy after tensile fracture: a low magnification and b high magnification

References 40

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Microstructure and Mechanical Behavior of CrFeNi₂V_0.5W_x (x = 0, 0.25) High-Entropy Alloys

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