Effects of Homogenized Treatment on Microstructure and Mechanical Properties of AlCoCrFeNi2.2 Near-Eutectic High-Entropy Alloy

doi:10.1007/s40195-021-01196-3

Abstract

Abstract:

A 4 kg AlCoCrFeNi_2.2 near-eutectic high-entropy alloy ingot was prepared by vacuum medium frequency induction melting. The effects of homogenized treatment on microstructure and mechanical properties of AlCoCrFeNi_2.2 were studied. The results showed that all the alloys consisted of the primary FCC phases and eutectic FCC/B2 phases. After homogenized treatment, lots of precipitated phases appeared in the primary phase. The hardness of the as-cast alloy was HV296. The hardness values of samples were decreased and were around HV250 after homogenized treatment. The tensile fracture strength of the as-cast alloy reached 900 MPa, while the elongation was 18%. After homogenized treatment at 900 °C, the alloy showed the most excellent mechanical properties with the fracture strength 880 MPa and the elongation was 29%, respectively. All the alloys displayed a mixture fracture mechanism, including ductile fracture in primary FCC phases and eutectic FCC phases, and brittle quasi-cleavage fracture in eutectic B2 phases. Through a simple heat treatment method, the strength of the alloy was not reduced but the plasticity was greatly enhanced, which was more conducive to the industrial application prospects.

Key words: High-entropy alloys, Eutectic alloys, Microstructure, Tensile strength, Microhardness

Xuan Huang, Yong Dong, Shaomu Lu, Chuanqiang Li, Zhengrong Zhang. Effects of Homogenized Treatment on Microstructure and Mechanical Properties of AlCoCrFeNi_2.2 Near-Eutectic High-Entropy Alloy[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(8): 1079-1086.

Figures/Tables 11

Table 1 Chemical mixing enthalpies of the atomic pairs among the alloying elements in Ni2.2 alloy (kJ/mol) [46]

Elements	Al	Co	Cr	Fe	Ni
Al	-	-	-	-	-
Co	- 19	-	-	-	-
Cr	- 10	- 4	-	-	-
Fe	- 11	- 1	- 1	-	-
Ni	- 22	0	- 7	- 2	-

Fig. 1 XRD pattern of as-cast Ni2.2 alloy [47]

Fig. 2 SEM microstructures of as-cast Ni2.2 alloy: a low magnification; b high magnification

Fig. 3 EDS mapping spectrums of as-cast Ni2.2 alloy

Table 2 EDS results of the as-cast Ni2.2 alloy (at%)

Microstructure	Structure	Al	Co	Cr	Fe	Ni
Primary phase (marked as PF in Fig. 2)	FCC	13.2	16.4	17.8	17.7	34.9
Eutectic structure (marked as EF and EB in Fig. 2)	FCC	10.7	16.8	19.0	20.0	33.6
	B2	32.8	11.3	5.7	8.5	41.7

Fig. 4 XRD patterns of Ni2.2 alloys homogenized at different temperatures

Fig. 5 SEM microstructures of as-homogenized Ni2.2 alloy at different temperatures: a, b H-900; c, d H-1000; e, f H-1100 °C

Table 3 EDS results of the Ni2.2 alloy after homogenizing at 1000 °C (at%)

Microstructure	Structure	Al	Co	Cr	Fe	Ni
Primary phase (marked as PF and PB in Fig. 5)	FCC	8.0	20.0	19.6	21.2	31.2
Primary phase (marked as PF and PB in Fig. 5)	B2	15.7	16.3	14.9	16.7	36.3
Eutectic structure (marked as EF and EB in Fig. 5)	FCC	7.7	19.2	21.2	21.1	30.8
Eutectic structure (marked as EF and EB in Fig. 5)	B2	34.3	9.5	4.8	8.0	43.4

Fig. 6 Vickers hardness of Ni2.2 alloy in as-cast and as-homogenized condition

Fig. 7 a Tensile stress-strain curve of the Ni2.2 alloy after homogenized at different temperatures; b elongation; c tensile yield strength; d tensile fracture strength

Fig. 8 Fracture surface morphologies of the Ni2.2 alloys in different conditions: a as-cast; b H-900; c H-1000; d H-1100

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