Microstructure and Mechanical Properties of In-situ Carbides Reinforced CoCrFeNi High-entropy Alloys

被引：0

作者：

Chen R. ^{[1
,2
]}

Chen X. ^{[1
]}

Gao X. ^{[2
]}

Qin G. ^{[1
,2
]}

Song Q. ^{[1
]}

Cui H. ^{[1
]}

机构：

[1] School of Materials Science and Engineering, Shandong University of Science and Technology, Shandong, Qingdao

[2] School of Materials Science and Engineering, Harbin Institute of Technology, Harbin

来源：

Cailiao Daobao/Materials Reports | 2022年 / 36卷 / 14期

基金：

中国国家自然科学基金;

关键词：

carbide; high-entropy alloy; mechanical property; microstructure; solid solution strengthening;

D O I：

10.11896/cldb.22050073

中图分类号：

学科分类号：

摘要：

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 volume 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 253HV0 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. © 2022 Cailiao Daobaoshe/ Materials Review. All rights reserved.

引用

共 30 条

[1]

Yeh J W, Chen S K, Lin S J, Et al., Advanced Engineering Materials, 6, (2004)

[2]

Cantor B, Chang I T H, Knight P, Et al., Materials Science & Engineering A, 375, (2004)

[3]

Zhang W, Liaw P K, Zhang Y., Science China Materials, 61, 1, (2018)

[4]

Zhang Y, Zuo T T, Tang Z, Et al., Progress in Materials Science, 61, (2014)

[5]

Gao X F, Chen R R, Liu T, Et al., Journal of Materials Science, 57, (2022)

[6]

Ye Y X, Liu C Z, Wang H, Et al., Acta Materialia, 147, (2018)

[7]

Du Y H, Ding D Y, Guo N, Et al., Materials Reports, 35, 17, (2021)

[8]

Qiu Y, Thomas S, Fabijanic D, Et al., Materials & Design, 170, (2019)

[9]

Lu Y P, Huang H F, Gao X Z, Et al., Journal of Materials Science & Technology, 35, 3, (2019)

[10]

Ye Y F, Wang Q, Lu J, Et al., Materials Today, 19, 6, (2016)

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