Effect of Ti Addition on Microstructure Evolution and Mechanical Properties of Al18Co13Cr10Fe14Ni45 Eutectic High-Entropy Alloys

doi:10.1007/s40195-023-01564-1

Abstract

Abstract:

A series of new (Al₁₈Co₁₃Cr₁₀Fe₁₄Ni₄₅)₍₁₀₀₋_x₎Ti_x (x = 0, 0.5, 1) eutectic high-entropy alloys (EHEAs) were designed and prepared with the aid of empirical parameter calculations and JMatPro software predictions. The effects of Ti addition on the microstructures, phase structures, and mechanical properties of Al₁₈Co₁₃Cr₁₀Fe₁₄Ni₄₅ EHEA were investigated. The results show that (Al₁₈Co₁₃Cr₁₀Fe₁₄Ni₄₅)₍₁₀₀₋_x₎Ti_x (x = 0, 0.5, 1) EHEAs are composed of the FCC and B2 phases. With the increase in Ti content, the strength of the EHEAs increases. The volume fraction of the FCC phase decreases, and the volume fraction of B2 phase increases; the size of nanoprecipitates within the B2 phase decreases and the number of them increases, which could be responsible for the high strength due to the addition of Ti. Among them, (Al₁₈Co₁₃Cr₁₀Fe₁₄Ni₄₅)_99.5Ti_0.5 alloy exhibited excellent properties with yield strength, ultimate tensile strength, and ductility of 690 MPa, 1065 MPa, and 9.18%, respectively.

Key words: High-entropy alloys, Eutectic, Microstructure, Mechanical properties

Jia-Qi Zheng, Ming-Liang Wang, Wen-Na Jiao, Long-Jiang Zou, Yan Di. Effect of Ti Addition on Microstructure Evolution and Mechanical Properties of Al₁₈Co₁₃Cr₁₀Fe₁₄Ni₄₅ Eutectic High-Entropy Alloys[J]. Acta Metallurgica Sinica (English Letters), 2023, 36(9): 1493-1501.

Figures/Tables 14

Table 1 Calculated parameters of \(\delta\), \(\Delta {H}_{\mathrm{mix}},\) and VEC for the (Al18Co13Cr10Fe14Ni45)(100−x)Tix alloys

Alloys	\(\delta\) (%)	\(\Delta {H}_{\mathrm{mix}}\) (KJ/mol)	\(\mathrm{VEC}\)
Ti0	5.48	− 12.84	7.93

Fig. 1 Solidification paths of Al18Co13Cr10Fe14Ni45 alloy by JMatPro

Fig. 2 a XRD patterns of the (Al18Co13Cr10Fe14Ni45)(100−x)Tix alloys; b detailed scans for the (110) peak of the B2 phase

Fig. 3 Microstructures of (Al18Co13Cr10Fe14Ni45)(100−x)Tix alloys: a x = 0; c x = 0.5; e x = 1; b, d, f high magnification images of the (Al18Co13Cr10Fe14Ni45)(100−x)Tix (x = 0, x = 0.5, x = 1) alloys

Table 2 Chemical compositions of different regions in (Al18Co13Cr10Fe14Ni45)(100−x)Tix (x = 0, x = 0.5, x = 1) HEAs (at.%)

Alloys		Al	Co	Cr	Fe	Ni	Ti
Ti0	FCC	15.75	14.92	11.26	15.39	42.68	-
	B2	26.55	10.47	5.20	10.25	47.53	-
Ti0.5	FCC	11.82	15.46	12.35	17.39	42.68	0.30
	B2	27.36	10.51	5.29	10.01	46.46	0.37
Ti1	FCC	12.36	15.01	12.36	16.83	42.79	0.65
	B2	26.94	10.36	5.72	9.87	45.87	1.24

Fig. 4 EPMA images of (Al18Co13Cr10Fe14Ni45)(100−x)Tix alloys: a x = 0, b x = 0.5, c x = 1

Table 3 Mixing enthalpy of element pairs (kJ/mol)

	Al	Co	Cr	Fe	Ni	Ti
Al	0	− 19	− 10	− 11	− 22	− 30
Co		0	− 4	− 1	0	− 28
fCr			0	− 1	− 7	− 7
Fe				0	− 2	− 17
Ni					0	− 35
Ti						0

Fig. 5 a-c TEM bright field image and selected area electron diffraction (SAED) patterns for the (Al18Co13Cr10Fe14Ni45)(100−x)Tix alloys; d-f corresponding bright field images of the B2 phase with quantities of dispersive nanoparticles inside

Fig. 6 DSC curves of (Al18Co13Cr10Fe14Ni45)(100−x)Tix(x = 0, 0.5, 1) alloys: a Ti0, b Ti0.5, c Ti1

Fig. 7 Engineering stress-strain curves of the (Al18Co13Cr10Fe14Ni45)(100−x)Tix (x = 0, 0.5, 1) alloys

Table 4 Mechanical properties of (Al18Co13Cr10Fe14Ni45)(100−x)Tix alloys

Alloys	Plastic strain (%)	Yield strength (MPa)	Ultimate tensile strength (MPa)	Vickers hardness (HV)
Ti0	10.83	623	1047	303.08
Ti0.5	9.18	690	1065	322.52
Ti1	7.51	779	1244	348.06

Fig. 8 Effect of Ti on engineering strain, yield strength, and hardness of (Al18Co13Cr10Fe14Ni45)(100−x)Tix alloys

Fig. 9 SEM images of the tensile fracture surfaces of (Al18Co13Cr10Fe14Ni45)(100−x)Tix alloys at room temperature: a x = 0, b x = 0.5, c x = 1

Fig. 10 Tensile plasticity and yield strength under the engineering stress-strain condition of the designed novel EHEAs as well as the classical eutectic alloys from Refs. [7,31,32,33,34,35,36,37,38]

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Effect of Ti Addition on Microstructure Evolution and Mechanical Properties of Al₁₈Co₁₃Cr₁₀Fe₁₄Ni₄₅ Eutectic High-Entropy Alloys

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