Microstructure, Mechanical and Wear Resistance Properties of AlCoCrFeNi2.1-xNi3Al Eutectic High-Entropy Alloy Matrix Composites

doi:10.1007/s40195-024-01772-3

Abstract

Abstract:

AlCoCrFeNi_2.1-xNi₃Al (x = 0, 5.0, 7.5, and 10 wt%, denoted as Ni₃Al0, Ni₃Al5.0, Ni₃Al7.5, and Ni₃Al10) eutectic high-entropy alloy (EHEA) matrix composites were fabricated by mechanical alloying and spark plasma sintering methods. The effects of Ni₃Al content on the microstructures, mechanical and wear properties of AlCoCrFeNi_2.1 EHEA were investigated. The results indicate that the AlCoCrFeNi_2.1-xNi₃Al composites present cellular grid morphologies composing of FCC/Ll₂ and B2 phases, and a small amount of Al₂O₃ and Cr₇C₃ phases. The addition of Ni₃Al significantly enhanced the compressive yield strength, compressive fracture strength, compressive strain and wear properties of the AlCoCrFeNi_2.1 composites. In particular, the Ni₃Al10 composite exhibits excellent comprehensive mechanical properties. The compressive yield strength, compressive fracture strength and compressive strain of the Ni₃Al10 composite, are 1845 MPa, 2301 MPa and 10.1%, respectively. The friction coefficient, wear width and depth, and mass loss of the Ni₃Al10 composite were 0.40, 0.9 mm, 20.5 mm, 0.016 g, respectively. Moreover, the wear mechanism of the Ni₃Al10 composite is major abrasive wear with a small amount of adhesive wear.

Key words: Eutectic high-entropy alloy composites, Microstructures, Mechanical properties, Wear properties

Li Li, Xiao Kong, Hui Jiang, Wenna Jiao, Di Jiang, Jichao Ren. Microstructure, Mechanical and Wear Resistance Properties of AlCoCrFeNi_2.1-xNi₃Al Eutectic High-Entropy Alloy Matrix Composites[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(12): 2019-2028.

Figures/Tables 11

Fig. 1 XRD diffraction patterns of the AlCoCrFeNi2.1-xNi3Al EHEA matrix composites

Fig. 2 SEM images of the AlCoCrFeNi2.1-xNi3Al EHEA matrix composites: a and b x = 0; c and d x = 5.0; e and f x = 7.5; g and h x = 10

Table 1 Chemical compositions of different regions in the AlCoCrFeNi2.1-xNi3Al EHEA matrix composites (at.%)

Alloys	Regions	Al	Co	Cr	Fe	Ni	C	O
x = 0	A	7.78	18.82	16.69	20.68	36.03	-	-
	B	28.37	11.81	10.24	12.96	36.72	-	-
	C	15.85	17.27	16.31	18.25	32.31	-	-
	D	29.67	5.47	5.67	6.33	9.85	6.46	36.55
	E	3.07	6.98	47.28	7.37	6.94	28.36
x = 5.0	A	14.57	17.46	11.69	18.39	37.89	-	-
	B	23.49	15.42	11.02	15.26	34.81	-	-
	C	10.64	19.06	17.01	21.43	31.32	-	-
	D	18.46	8.04	7.58	8.21	16.82	11.00	29.89
	E	2.21	4.60	50.02	7.81	10.81	24.55	-
x = 7.5	A	8.89	19.07	16.57	23.75	31.72	-	-
	B	23.69	13.08	15.14	13.49	30.89	-	-
	C	13.89	17.57	15.89	18.53	34.12	-	-
	D	19.55	7.47	9.63	6.77	12.24	12.02	32.32
	E	1.05	1.77	51.17	2.73	3.26	39.05	0.99
x = 10	A	6.94	18.09	18.96	23.60	32.41	-	-
	B	34.22	12.30	7.62	13.57	32.29	-	-
	C	16.7	18.65	17.87	19.51	27.30	-	-
	D	29.19	4.68	2.18	5.42	20.92	14.68	22.93
	E	0.22	2.38	54.08	4.41	2.27	36.09	0.55

Fig. 3 EDS elemental mapping of the AlCoCrFeN2.1 EHEA

Fig. 4 a Vickers hardness, b compressive stress-strain curve at room temperature of the AlCoCrFeNi2.1-xNi3Al EHEA matrix composites

Table 2 Mechanical properties of the AlCoCrFeNi2.1-xNi3Al EHEA matrix composites

Alloys	Compressive yield strength, σ_y (MPa)	Compressive fracture strength, σ_bc (MPa)	Plasic strain, ε_{P (%)}	Vickers hardness (HV)
Ni₃Al0	-	1700	7.0	628
Ni₃Al5.0	1614	2148	8.8	611
Ni₃Al7.5	1722	1989	9.5	619
Ni₃Al10	1845	2301	10.1	626

Fig. 5 Friction coefficient curves of the AlCoCrFeNi2.1-xNi3Al EHEA matrix composites

Fig. 6. 3D morphology and cross-section profiles of wear scar at middle part of the AlCoCrFeNi2.1-xNi3Al EHEA matrix composites: a x = 0, b x = 5.0, c x = 7.5, d x = 10

Fig. 7 Relation between mass loss and microhardness for the composites

Fig. 8 SEM images of AlCoCrFeNi2.1-xNi3Al EHEA matrix composites after wear: a and b x = 0, c and d x = 5.0, e and f x = 7.5, g and h x = 10

Fig. 9 a-c Schematic of microstructural evolution mechanism of “crack” phenomenon

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Microstructure, Mechanical and Wear Resistance Properties of AlCoCrFeNi_2.1-xNi₃Al Eutectic High-Entropy Alloy Matrix Composites

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