原位自生碳化物增强CoCrFeNi高熵合金的显微组织与力学性能

doi:10.11896/cldb.22050073

Abstract
Figure/Table
References
Related Citation (15)

Download:

Full Text ( PDF ) (5670KB)
Export: BibTeX | EndNote (RIS)

Abstract In order to strengthen FCC-type high-entropy alloy (HEA), Ti and C were added to FCC single-phase CoCrFeNi HEA to realize the strengthening effect. (CoCrFeNi)_100-x(TiC)_x(x=0, 2, 4, 6, 8(atomic fraction,%)) was prepared by vacuum arc melting. Effects of different contents of Ti and C on the microstructure and mechanical properties of CoCrFeNi HEA were studied. The results show that after adding Ti and C, the microstructure of (CoCrFeNi)_100-x(TiC)_x changes from single FCC phase to FCC matrix phase and in-situ Ti-rich carbides. The formation of Ti-rich carbides does not change the type of matrix phase. Ti-rich carbides solidify along the interdendrite, which is lamellar and connected with each other to form a network structure. With the increase of Ti and C content, the content of FCC matrix phase gradually decreases, and the vo-lume fraction of Ti-rich carbides gradually increases to 12%. The tensile test results show that with the increase of Ti-rich carbides content, the yield strength and tensile strength of the alloy increase continuously, while the elongation decreases; with x=8, the tensile strength can be increased from 409 MPa (x=0) to 618 MPa, with the applicable plasticity maintained, and the elongation can still reach 15.7%. The hardness test results show that the hardness of the alloy increases with the increase of Ti rich carbides content; with x=8, the hardness value is 253HV_{0 2}. The second phase strengthening of in-situ Ti-rich carbides, solid solution strengthening and the synergistic effect of dendritic lamellar and network structure improve the strength of the alloy and ensures its good plasticity.

Key words： high-entropy alloy carbide microstructure mechanical property solid solution strengthening

Published: Online: 2022-07-26

CLC number:

TG139

Fund:National Natural Science Foundation of China (51825401).

	Service
	E-mail this article
	Add to my bookshelf
	Add to citation manager
	E-mail Alert
	RSS
	Articles by authors
	CHEN Ruirun
	CHEN Xiugang
	GAO Xuefeng
	QIN Gang
	SONG Qiang
	CUI Hongzhi

Cite this article:

CHEN Ruirun,CHEN Xiugang,GAO Xuefeng, et al. Microstructure and Mechanical Properties of In-situ Carbides Reinforced CoCrFeNi High-entropy Alloys[J]. Materials Reports, 2022, 36(14): 22050073-6.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.22050073 OR http://www.mater-rep.com/EN/Y2022/V36/I14/22050073

1 Yeh J W, Chen S K, Lin S J, et al. Advanced Engineering Materials, 2004, 6, 299.
2 Cantor B, Chang I T H, Knight P, et al. Materials Science & Engineering A, 2004, 375, 213.
3 Zhang W, Liaw P K, Zhang Y.Science China Materials,2018,61(1),2.
4 Zhang Y, Zuo T T, Tang Z, et al. Progress in Materials Science, 2014, 61, 1.
5 Gao X F, Chen R R, Liu T, et al. Journal of Materials Science,2022,57,6573.
6 Ye Y X, Liu C Z, Wang H, et al. Acta Materialia, 2018, 147, 78.
7 Du Y H, Ding D Y, Guo N, et al. Materials Reports, 2021, 35(17), 17051(in Chinese).
杜宇航,丁德渝,郭宁, 等. 材料导报, 2021, 35(17), 17051.
8 Qiu Y, Thomas S, Fabijanic D, et al. Materials & Design, 2019, 170, 107698.
9 Lu Y P, Huang H F, Gao X Z, et al. Journal of Materials Science & Technology, 2019, 35(3), 369.
10 Ye Y F, Wang Q, Lu J, et al. Materials Today, 2016, 19(6), 349.
11 Miracle D B, Senkov O N.Acta Materialia, 2017, 122, 448.
12 Zhao Y, Wang M L, Cui H Z, et al. Journal of Alloys and Compounds, 2019, 805, 585.
13 Yang X, Zhang Y.Materials Chemistry and Physics,2012,132(2-3),233.
14 Zhang Y, Zuo T T, Tang Z, et al. Progress in Materials Science, 2014, 61, 1.
15 Senkov O N, Miller J D, Miracle D B, et al. Nature Communications, 2015, 6(1), 1.
16 Liu W H, Lu Z P, He J Y, et al. Acta Materialia, 2016, 116, 332.
17 Qin G, Xue W T, Chen R R, et al. Materialia, 2019, 6, 100259.
18 Fu Z Q, Chen W P, Wen H M, et al. Acta Materialia, 2016, 107, 59.
19 Wang W T, Chen S Y, Zhang Y, et al. Materials Reports, 2021, 35(17), 17043(in Chinese).
王伟彤, 陈淑英, 张勇, 等. 材料导报, 2021, 35(17), 17043.
20 Zhang G J, Li R, Liu D H, et al. Materials Reports, 2021, 35(17), 17026(in Chinese).
张国家, 李忍, 刘德华, 等. 材料导报, 2021, 35(17), 17026.
21 Qin G, Chen R R, Zheng H T, et al. Journal of Materials Science & Technology, 2019, 35(4), 578.
22 Wang M L, Lu Y P, Zhang G J, et al. Vacuum, 2021, 184, 109905.
23 Li Z J, Fu P X, Hong C F, et al. Materials Today Communications, 2020, 26, 102095.
24 Zhang G P, Wang G F, Yang T H, et al. Materials Science and Technology, 2020, 36(4), 409.
25 Zhao C M, Zhu H G, Xie Z H.Intermetallics, 2022, 140, 107398.
26 Yang S H, Qu Y D, Zhang Y F, et al. Special-Cast and Non-Ferrous Alloys, 2019, 39(7), 701(in Chinese).
杨思华,曲迎东,张宇峰,等. 特种铸造及有色合金,2019,39(7),701.
27 Zhang J F, Jia T, Qiu H, et al. Journal of Materials Science & Technology, 2020, 42(7), 122.
28 Zhang Y, Zhou Y J, Lin J P, et al. Advanced Engineering Materials, 2008, 10(6), 534
29 Takeuchi A, Inoue A.Materials Transactions, 2005, 46(12), 2817.
30 Huang H, Tian Y, Yuan G Y, et al. Materials Characterization, 2015, 108, 132.