AlCoCrFeNi<i><sub>x</sub></i>高熵合金高温热处理微观组织演变及力学性能

doi:10.11896/cldb.23120247

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (24596KB)
Export: BibTeX | EndNote (RIS)

Abstract Due to dendrite growth and element segregation during solidification, dual-phase high-entropy alloys cannot possess good comprehensive mechanical properties. Different from the design of eutectic alloy and the modification of casting process, phase transition of the metastable phase provides an optional route to regulate the microstructure and mechanical properties of the high-entropy alloy. However, phase constitution and distribution are closely related to the type and content of the alloying element, resulting in the varying effect of the solid-state phase transformation on the microstructure and mechanical properties of the multi-component high-entropy alloys. AlCoCrFeNi_x (1.4≤x≤1.7) high-entropy alloys were prepared by arc-melting method and the effect of high-temperature heat treatment on the microstructure and mechanical properties was investigated. As the Ni content is increased, the proportion of dendrite region (BCC/B2 spinodal structure) decreases gradually, while the proportion of interdendrite region increases with the structure evolving from FCC dendrite to FCC/B2 eutectic. Correspondingly, the yield strength and tensile strength of the alloys decrease from 1 067 MPa (x=1.4) and 1 416 MPa (x=1.5) to 464 MPa and 1 191 MPa (x=1.7), respectively, and the elongation increases from 1.7% (x=1.4) to 11.5% (x=1.7). After heat treatment at 1 100 ℃, the BCC/B2 spinodal structure transforms into FCC and B2 dual-phase structure, giving rise to the increase of plasticity and the decrease of strength. The heat-treated AlCoCrFeNi_1.6 and AlCoCrFeNi_1.7 high-entropy alloys present the typical network structure of the FCC phase, which contains the B2 precipitates and can prevent the reduction of the yield strength. The heat-treated AlCoCrFeNi_1.7 high-entropy alloys possess the good comprehensive mechanical properties with 52.2% increment in elongation, while the decrement in yield strength and tensile strength are only 4.1% and 7.5%, respectively.

Key words： high-entropy alloy heat treatment phase transition microstructure mechanical property

Published: 25 January 2025 Online: 2025-01-21

CLC number:

TG113

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	CAO Leigang
	HOU Pengyu
	YANG Yue
	MENG Yi
	LIU Yuan
	CUI Yan

Cite this article:

CAO Leigang,HOU Pengyu,YANG Yue, et al. Microstructure Evolution and Mechanical Properties of AlCoCrFeNi_x High-entropy Alloys Heat-treated at High Temperature[J]. Materials Reports, 2025, 39(2): 23120247-7.

URL:

https://www.mater-rep.com/EN/10.11896/cldb.23120247 OR https://www.mater-rep.com/EN/Y2025/V39/I2/23120247

1 Cantor B, Chang I T H, Knight P. Materials Science & Engineering A, 2004, 375-377, 213.
2 Yeh J W, Chen S K, Lin S J, et al. Advanced Engineering Materials, 2004, 6(5), 299.
3 Gangireddy S, Gwalani B, Soni V, et al. Materials Science and Enginee-ring A, 2019, 739, 158.
4 Yu Q Y, Xie X C, Lan B, et al. Journal of Materials Engineering, 2024, 52(1), 45 (in Chinese).
于秋颖, 谢孝昌, 兰博, 等. 材料工程, 2024, 52(1), 45.
5 Miao J, Li T, Li Q, et al. Materials, 2023, 16(3), 1085.
6 Zhao J H, Jin R H, Jin X L, et al. Materials Reports, 2023, 37(17), 22030061 (in Chinese).
赵建华, 金荣华, 纪秀林, 等. 材料导报, 2023, 37(17), 22030061.
7 Tian Z, Li C C, Wu Y, et al. Journal of Materials Engineering, 2024, 52(1), 1 (in Chinese).
田震, 李聪聪, 吴渊, 等. 材料工程, 2024, 52(1), 1.
8 Wan Y, Mo J, Wang X, et al. Acta Metallurgical Sinica, 2021, 34(11), 1585.
9 Lu Y, Gao X, Jiang L, et al. Acta Materialia, 2017, 124, 143.
10 Wang W R, Wang W L, Yeh J W. Journal of Alloys and Compounds, 2014, 589, 143.
11 Cao L, Wang X, Wang Y, et al. Applied Physics A, 2019, 125(10), 699.
12 Feuerbacher M, Heidelmann M, Thomas C. Materials Research Letters, 2015, 3(1), 1.
13 He J, Liu W, Wang H, et al. Acta Materialia, 2014, 62, 105.
14 Lu Y, Dong Y, Guo S, et al. Scientific Reports, 2014, 4, 6200.
15 Shi P, Li R, Li Y, et al. Science, 2021, 373(6557), 912.
16 Wani I S, Bhattacharjee T, Sheikh S, et al. Materials Research Letters, 2016, 4(3), 174.
17 Bhattacharjee T, Wani I S, Sheikh S, et al. Scientific Reports, 2018, 8, 3276.
18 Shi P, Ren W, Zheng T, et al. Nature Communications, 2019, 10, 489.
19 Divinski S V, Pokoev A V, Neelamegan E, et al. Diffusion Foundations, 2018, 17, 69.
20 Wang X, Zang Z, Wang Z, et al. Materials, 2022, 15(3), 1215.
21 Munitz A, Salhov S, Hayun S, et al. Journal of Alloys and Compounds, 2016, 683, 221.
22 Hou P, Yang Y, Zhang L, et al. Materials, 2023, 16(22), 7161.
23 Tian M Y, Wu C J, Liu Y, et al. Materials Reports, 2020, 34(17), 17067 (in Chinese).
田梦云, 吴长军, 刘亚, 等. 材料导报, 2020, 34(17), 17067.
24 Cao L G, Wang F, Hou P Y, et al. Journal of Materials Engineering, 2024, 52(1), 249 (in Chinese).
曹雷刚, 王帆, 侯鹏宇,等. 材料工程, 2024, 52(1), 249.
25 Wang W R, Wang W L, Wang S C, et al. Intermetallics, 2012, 26, 44.
26 Qu S, Li Y, Wang C, et al. Materials Science & Engineering A, 2020, 787, 139455.
27 Nassar A, Mullis A, Cochrane R, et al. Journal of Alloys and Compounds, 2022, 900, 163350.
28 Linden Y, Pinkas M, Munitz A, et al. Scripta Materialia, 2017, 139, 49.
29 Lei Z, Liu X, Wu Y, et al. Nature, 2018, 563(7732), 546.