C对CoFe2NiV0.5Mo0.2高熵合金结构和力学性能的影响

doi:10.11896/cldb.21010131

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Abstract Effects of the addition of C with different molar fraction (0%—10%) on microstructure, phase structure and mechanical properties at room temperature of the CoFe₂NiV_0.5Mo_0.2 high entropy alloy were investigated. The results show that with the increase of C content, the microstructure of alloy changed from a single face centered cubic structure (FCC) to eutectic structure (FCC matrix+V₈C₇ carbide fiber) and then to (FCC matrix+coarse V₈C₇+acicular MoC). The compressive yield strength of the alloy was improved significantly and remained good ductility simultaneously. When C content is 6%, the yield strength and hardness of the alloy can reach 900 MPa and 270HV respectively. The research results show that elements with small atomic radius represented by C can solubilize as interstitial element or combined with metal element to form carbide second phase, which can improve the FCC-structured high entropy alloy strength, thus optimizing its comprehensive mechanical properties.

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

Published: 26 September 2021

CLC number:

TG132.3

Fund:National Key Research and Development Program of China (2019YFA0209901, 2018YFA0702901), National Na-tural Science Foundation of China (51822402, U20A20278), Liaoning Revitalization Talents Program (XLYC1807047), and Fund of the State Key Laboratory of Solidification Processing in NWPU ( SKLSP201902).

About author:: Guojia Zhangreceived his master degree in Shenyang University of Technology in 2019. He has been pursuing his Ph.D. degree at Dalian University of Technology under the supervision of prof. Yiping Lu since 2019. His research interests are composition design, deformation mechanism and toughening of high-entropy alloys.
Yiping Luis currently the deputy dean of School of Materials Science and Engineering at Dalian University of Technology, the National High Level Talents Plan (2020), the Young and Middle-aged Innovation Lea-ders of the “Ministry of Science and Technology of China” (2020), the “Outstanding Youth Fund of the National Natural Science Foundation of China” (2018), the Top Youth Talents of Liaoning Province of the first “Xingliao Talents Plan” (2018), the Outstanding Young Scientific Foundation of Dalian City (2019), the Outstanding Young Scientific and Technological Star of Dalian City (2016), Council/Deputy Secretary general of Solidification Science and Technology Branch, Chinese
Materials Research Society, Council of Space Materials Science and Techno-logy Branch, Council of Youth Working Committee of Chinese Materials Research Society, The editor of Acta Metallurgica Sinica (English Letters), Materials Reports, Materials China, Special Casting and Nonferrous Alloys, etc. In the past five years, Google Scholar has been cited nearly 3 000 times, with H index of 28, 3 highly cited articles and 8 authorized invention patents. His research interests are composition design theory and industrial preparation technology of high-entropy alloys.

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	ZHANG Guojia
	LI Ren
	LIU Dehua
	LU Yiping
	WANG Tongmin
	LI Tingju

Cite this article:

ZHANG Guojia,LI Ren,LIU Dehua, et al. Effect of C on Microstructure and Mechanical Properties of CoFe₂NiV_0.5Mo_0.2 High Entropy Alloy[J]. Materials Reports, 2021, 35(17): 17026-17030.

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http://www.mater-rep.com/EN/10.11896/cldb.21010131 OR http://www.mater-rep.com/EN/Y2021/V35/I17/17026

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