激光熔化沉积Al<i><sub>x</sub></i>CoCrFeNi系高熵合金的组织与性能

doi:10.11896/cldb.22090238

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Abstract In this work, laser melting deposition technology (LMD) has been exploited to manufactured Al_xCoCrFeNi (x=0, 0.3, and 0.5, denoted as Al_x hereafter), and the impacts of Al addition on phase structure, microstructure, and performance of LMD-CoCrFeNi alloys were investigated. The results indicate that the microstructure of Al₀ and Al_0.3 consists of a single-phase FCC solid solution, whereas the one in Al_0.5 is composed of a B2 phase enriched Al and Ni atoms precipitated at the grain boundary/dendritic grain boundary for the FCC phase matrix. The tensile mechanical properties of the alloy samples showed that the yield strength of the Al_0.5CoCrFeNi high entropy alloy reached 2.66 times of the original alloy (140—372 MPa), the tensile strength reached ～716 MPa, and the elongation was ～40%. The electrochemical polarization curve analysis shows that a prominently stable passivation region represents in the Al_xCoCrFeNi HEA in 1 mol/L H₂SO₄ solution. Fascinatingly, the obtuse current and dimensional obtuse current exhibit decrease first and then increase for the tendency accompanied with the increase of Al content.

Key words： laser melting deposition high-entropy alloys microstructure mechanical property electrochemical property

Published: 25 March 2024 Online: 2024-04-07

CLC number:

TG135＋.1

Fund:Opening Project of State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment (CSO-102-001), Shenzhen International Cooperation Research Project of China (GJHZ20200731095203011), National Natural Science Foundation of China (52001288) and CAEP Foundation (YZJJLX2019010).

Corresponding Authors: ^*lijinfeng305@126.com

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	HUANG Liufei
	WANG Xiaoying
	SUN Yaoning
	CHEN Liang
	WANG Long
	REN Congcong
	YANG Xiaoshan
	WANG Dou
	LI Jinfeng

Cite this article:

HUANG Liufei,WANG Xiaoying,SUN Yaoning, et al. Microstructure and Properties of Al_xCoCrFeNi High-entropy Alloys via Laser Melting Deposition[J]. Materials Reports, 2024, 38(6): 22090238-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22090238 OR http://www.mater-rep.com/EN/Y2024/V38/I6/22090238

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