Effect of Different C Contents on Microstructure and Properties of VCoNi Medium-entropy Alloys

doi:10.11901/1005.3093.2022.341

Chinese Journal of Materials Research

2023, Vol. 37

Issue (9): 685-696 DOI: 10.11901/1005.3093.2022.341

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Effect of Different C Contents on Microstructure and Properties of VCoNi Medium-entropy Alloys

XING Dingqin¹, TU Jian¹^,²^,³(

), LUO Sen¹, ZHOU Zhiming¹^,²

^1.College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China
^2.Chongqing Municipal Key Laboratory of Institutions of Higher Education for Mould Technology, Chongqing University of Technology, Chongqing 400054, China
^3.Chongqing Materials Research Institute Co. Ltd., Chongqing 400707, China

Cite this article:

XING Dingqin, TU Jian, LUO Sen, ZHOU Zhiming. Effect of Different C Contents on Microstructure and Properties of VCoNi Medium-entropy Alloys. Chinese Journal of Materials Research, 2023, 37(9): 685-696.

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Abstract

VCoNi medium entropy alloy (MEA) with severe lattice distortion has good strength and toughness. In this work, the MEAs (VCoNi)_100-_x C _x (x=0, 0.1, 0.4, 1 and 2.8) were repaired by the following processes: the mixture of alloy powders was melted per vacuum non-consumable arc melting furnace; Then the as-cast alloy was subjected to thermal compression deformation (45% deformation) after being heated at 1000℃ for 2 h; further rolling deformation at room temperature (70% deformation); which was finally heated at 1000℃ for 1 min followed by water quenching to acquire the recrystallized alloys. Then the effect of different C additions on the microstructure, mechanical and wear properties of the MEAs was systematically studied via SEM with EDS and EBSD, universal tensile testing machine and pin/disc wear tester. The results show that when the C content is between 0 and 1, with the increase of C content, the grain size of both the homogenized and recrystallized EMAs decrease, while the amount of second phase particles increases. For the homogenized EMAs, textures converge gradually toward the ɑ-orientation; while for recrystallized EMAs, textures converge on the-orientation, where is the strongest point of the textures also situated. When the C content is between 1 and 2.8, coarse cellular grains emerge in the homogenized EMAs, while the second phases precipitate as coexisting rods and particulates, however the annealing twinning is sharply reduced, and no typical texture type exists. The tensile test results show that (VCoNi)_99.9C_0.1 exhibits an optimal strength-ductility balance, which may be attributed to the appropriate size and distribution of the particles, resulting in fine grain strengthening, interstitial strengthening and particles strengthening. The friction and wear test results show that the wear property of the EMAs is improved due to the C addition, which is mainly attributed to the weakened abrasive wear mechanism and the enhanced adhesive and oxidative wear mechanisms. Therefore, the addition of appropriate amount of C is conducive to optimize the microstructure of (VCoNi)MEA and further improve the mechanical and wear properties.

Key words: metallic materials medium entropy alloy microstructure texture mechanical property wear property

Received: 21 June 2022

ZTFLH:

TG139

Fund: Scientific Research Project of Chongqing University of Technology(KLA22007)

Corresponding Authors: TU Jian, Tel: (023)62563178, E-mail: tujian@cqut.edu.cn

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	XING Dingqin
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https://www.cjmr.org/EN/10.11901/1005.3093.2022.341 OR https://www.cjmr.org/EN/Y2023/V37/I9/685

Fig.1 Phases fraction as function of temperature for (VCoNi)_100-_x C _x (x=0, 0.1, 0.4, 1 and 2.8) samples (a) C0; (b) C0.1; (c) C0.4; (d) C1; (e) C2.8

Fig.2 SEM images of as-homogenized samples: (a) C0; (b) C0.1; (c) C0.4; (d) C1; (e) C2.8

Fig.3 EDS element distribution of as-homogenized samples (a) C0; (b) C0.1; (c) C0.4; (d) C1; (e) C2.8

Fig.4 EBSD of as-homogenized samples (VCoNi)_100-_x C _x (x=0, 0.1, 0.4, 1 and 2.8) (a~e). inverse pole figure (a₁~e₁); phase maps (a₂~e₂) and grains boundary maps(a₃~e₃)

Fig.5 φ₂=45°, 65° and 90° sections of ODF for the as-homogenized samples (a) C0; (b) C0.1; (c) C0.4; (d) C1; (e) C2.8

Fig.6 Volume fractions of main texture components in as-homogenized samples with different C contents

Fig.7 SEM images of microstructure for the as-recrystallized samples (a) C0; (b) C0.1;(c) C0.4

Fig.8 EBSD maps of as-recrystallized (VCoNi)_100-_x C _x (x=0, 0.1 and 0.4) samples in (a~c), respectively (a₁~c₁) IPF maps; (a₂~c₂) phase maps; (a₃~c₃) GB maps

Fig.9 φ₂=45°, 65° and 90° sections of the ODFs (determined by EBSD) of as-recrystallized C0 sample in (a), C0.1 sample in (b), C0.4 sample in (c)

Fig.10 Volume fractions of main texture components in as-recrystallized samples with different C contents

Fig.11 representative tensile engineering stress-strain curves(a); corresponding strain-hardening rate curves (b); fracture surfaces of as-recrystallized C0, C0.1 and C0.4 samples are shown in (c), (d) and (e)

Table 1 Yield strength, ultimate tensile strength and elongation of (VCoNi)_100-_x C _x medium entropy alloy

Fig.12 Real time friction coefficient (a); average friction coefficient and wear rate (b); wear scar profile (c); wear scar morphology of as-recrystallized C0 sample (d), C0.1 sample (e) and C0.4 sample (f)

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