Microstructure Selection in Ton Class Ingot of Al17Cr10Fe33Ni36Mo2Ti2 Eutectic High Entropy Alloy

doi:10.1007/s40195-024-01752-7

Abstract

Abstract:

The eutectic high entropy alloys have attracted extensive attention and are considered one of the most promising new metal materials. The microstructures of large eutectic high entropy alloy ingot with excellent casting performance have been rarely reported. In this study, we have prepared a ton class eutectic high entropy alloy ingot via vacuum induction melting for the first time. The evolution of microstructure and macro-segregation from the edge region to the core of the ingot were also revealed. It was found that there was no significant macro-segregation in ton class eutectic high entropy alloy ingot, and chemical elements were distributed uniformly. The coupled growth of the primary phases and eutectic colonies were homogeneously distributed in the ingot, and there is no traditional columnar grain region from the edge region of the ingot to the core. The tensile strength of the sample in the R/2 region of the ton class ingot with elongation greater than 10% is 892.3 MPa, showing an excellent comprehensive mechanical property. This study exhibits an important guidance for the industrial application of large eutectic high entropy alloy casting ingot.

Key words: Eutectic high entropy alloy, Ton class ingot, Segregation, Microstructure, Mechanical properties

Xinbo Shi, Yunji Qiu, Xiaoyu Bai, Yiming Chen, Yongqiang Wang, Tao Xu, Jincheng Wang, Junjie Li, Zhijun Wang. Microstructure Selection in Ton Class Ingot of Al₁₇Cr₁₀Fe₃₃Ni₃₆Mo₂Ti₂ Eutectic High Entropy Alloy[J]. Acta Metallurgica Sinica (English Letters), 2024, 37(12): 2008-2018.

Figures/Tables 12

Fig. 1 Schematic sampling positions of large Al17Cr10Fe33Ni36Mo2Ti2 ingot: a1 schematic the whole ingot; a2 schematic ingot longitudinal section sampling location; a3 schematic ingot cross section sampling position; b1 real ingot longitudinal section; b2 real ingot bottom

Table 1 Elements concentration (wt%) in different parts of the large alloy ingot

Position	Al	Cr	Fe	Ni	Mo	Ti
Nominal	8.76	9.93	36.26	40.36	3.11	1.58
Average	7.82	9.67	35.50	41.73	3.20	1.70
I	7.71	9.68	35.56	41.65	3.16	1.76
II	7.45	9.87	35.87	41.24	3.37	1.76
III	8.15	9.50	35.16	42.06	3.16	1.66
IV	7.62	9.68	35.66	41.86	3.16	1.66
V	8.15	9.59	35.26	41.86	3.16	1.66
1	7.88	9.73	35.66	41.50	3.15	1.70
2	8.07	9.55	35.33	41.86	3.15	1.65
3	7.94	9.65	35.41	41.74	3.20	1.67
4	7.73	9.75	35.61	41.58	3.25	1.71
5	7.90	9.61	35.35	41.86	3.18	1.71
6	7.87	9.56	35.34	41.97	3.19	1.69
7	7.81	9.66	35.44	41.82	3.20	1.70
8	7.78	9.67	35.46	41.78	3.22	1.71
9	7.71	9.76	35.65	41.56	3.25	1.70
10	7.82	9.63	35.48	41.83	3.17	1.68
11	7.79	9.65	35.42	41.78	3.22	1.76
12	7.69	9.72	35.63	41.66	3.21	1.71
13	7.67	9.79	35.73	41.47	3.25	1.72
14	7.70	9.64	35.53	41.89	3.17	1.70
15	7.87	9.63	35.52	41.72	3.19	1.69

Fig. 2 Changes of the elements concentration in different parts of large Al17Cr10Fe33Ni36Mo2Ti2 alloy ingot: a1 from the edge region to the central region Al, Cr, Fe, Mo; a2 from the edge region to the central region Ni, Fe; b1 from the top region to the bottom region Al, Cr, Fe, Mo; b2 from the top region to the bottom region Ni, Fe

Fig. 3 Microstructures from the edge to the central region at the positions in Fig. 1a3: a1-a2 images of the front side (longitudinal section of the ingot) of the sample; b1-b2 images of the top side of the sample; c1, c2 images of the right side of the sample

Fig. 4 EDS images of as-cast Al17Cr10Fe33Ni36Mo2Ti2 alloy at microscale

Fig. 5 Engineering tensile strain-stress curves under two different states at position III in Fig. 1 a3

Table 2 Elements segregation index ($\Delta C$) of large Al17Cr10Fe33Ni36Mo2Ti2 alloy ingot (%)

Position	Al	Cr	Fe	Ni	Mo	Ti
I	− 1.41	0.10	0.17	− 0.19	− 1.25	3.53
II	− 4.73	2.07	1.04	− 1.17	5.31	3.53
III	4.22	− 1.76	− 0.96	0.79	− 1.25	− 2.35
IV	− 2.56	0.10	0.45	0.31	− 1.25	− 2.35
V	4.22	− 0.83	− 0.68	0.31	− 1.25	− 2.35
1	0.77	0.62	0.45	− 0.55	− 1.56	0
2	3.20	− 1.24	− 0.48	0.31	− 1.56	− 2.94
3	1.53	− 0.21	− 0.25	0.02	0	− 1.76
4	− 1.15	0.83	0.31	− 0.36	1.56	0.59
5	1.02	− 0.62	− 0.42	0.31	− 0.63	0.59
6	0.64	− 1.14	− 0.45	0.58	− 0.31	− 0.59
7	− 0.13	− 0.10	− 0.17	0.22	0	0
8	− 0.51	0	− 0.11	0.12	0.63	0.59
9	− 1.41	0.93	0.42	− 0.41	1.56	0
10	0	− 0.41	− 0.06	0.24	− 0.94	− 1.18
11	− 0.38	− 0.21	− 0.23	0.12	0.63	3.53
12	− 1.66	0.52	0.37	− 0.17	0.31	0.59
13	− 1.92	1.24	0.65	− 0.62	1.56	1.18
14	− 1.53	-0.31	0.08	0.38	− 0.94	0
15	0.64	-0.41	0.06	− 0.02	− 0.31	− 0.59

Fig. 6 Changes of the elements segregation index ($\Delta C$) in different parts of large Al17Cr10Fe33Ni36Mo2Ti2 alloy ingot: a from the edge region to the central region; b from the top region to the bottom region

Fig. 7 Statistic of the microstructure from the edge region to the central region: a the sizes of the different phases and colonies; b volume fraction of each phase

Fig. 8 EBSD images of typical microstructure: a1 Phase map at large scale; a2 IPF image of FCC; a3 IPF image of B2; b1 phase map at magnified scale; b2 IPF image of FCC in b1; b3 IPF image of B2 in b1

Fig. 9 SEM images of a as-cast alloy, b solution heat treated alloy

Fig. 10 EBSD images of a as-cast alloy, b solution heat treated alloy and corresponding grain size frequency distribution of FCC and B2 phases

References 40

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Microstructure Selection in Ton Class Ingot of Al₁₇Cr₁₀Fe₃₃Ni₃₆Mo₂Ti₂ Eutectic High Entropy Alloy

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