激光熔化沉积AlxCoCrFeNi系高熵合金的组织与性能

doi:10.11896/cldb.22090238

材料导报

2024, Vol. 38

Issue (6): 22090238-6 https://doi.org/10.11896/cldb.22090238

金属与金属基复合材料

激光熔化沉积Al_xCoCrFeNi系高熵合金的组织与性能

黄留飞^1,2,3, 王小英², 孙耀宁³, 陈亮¹, 王龙¹, 任聪聪², 杨晓珊², 王斗², 李晋锋^2,*

1 核电安全监控技术与装备国家重点实验室,广东深圳 518172
2 中国工程物理研究院材料研究所,四川绵阳 621908
3 新疆大学机械工程学院,乌鲁木齐 830017

Microstructure and Properties of Al_xCoCrFeNi High-entropy Alloys via Laser Melting Deposition

HUANG Liufei^1,2,3, WANG Xiaoying², SUN Yaoning³, CHEN Liang¹, WANG Long¹, REN Congcong², YANG Xiaoshan², WANG Dou², LI Jinfeng^2,*

1 State Key Laboratory of Nuclear Power Safety Monitoring Technology and Equipment, Shenzhen 518172, Guangdong, China
2 Institute of Materials, China Academy of Engineering Physics, Mianyang 621908, Sichuan, China
3 School of Mechanical Engineering, Xinjiang University, Urumqi 830017, China

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摘要本工作通过激光熔化沉积技术制备了Al_xCoCrFeNi (x=0,0.3,0.5)系高熵合金,并研究了Al的添加对激光熔化沉积CoCrFeNi合金的物相结构、组织形貌及性能的影响规律。研究结果表明:Al₀与Al_0.3高熵合金的微观结构为单相FCC结构固溶体,而Al_0.5高熵合金的微观结构为在FCC相基底的晶界/枝晶界处析出富集Al、 Ni原子的B2相。合金样品的拉伸力学性能表明:Al_0.5CoCrFeNi高熵合金的屈服强度达到了原合金的2.66倍 (140～372 MPa),抗拉强度达到约 716 MPa,延伸率约为 40%;电化学极化曲线分析表明,Al_xCoCrFeNi系高熵合金在1 mol/L的H₂SO₄溶液中均具有显著的稳定钝化区,Al添加引起的致钝电流和维钝电流随着Al含量的增加呈现先减小后增大的趋势。

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	黄留飞
	王小英
	孙耀宁
	陈亮
	王龙
	任聪聪
	杨晓珊
	王斗
	李晋锋

关键词: 激光熔化沉积高熵合金组织结构力学性能电化学性能

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

出版日期: 2024-03-25 发布日期: 2024-04-07

ZTFLH:

TG135＋.1

基金资助: 核电安全监控技术与装备国家重点实验室开放课题(CSO-102-001);深圳市国际合作研究项目(GJHZ20200731095203011);国家自然科学基金(52001288);中国工程物理研究院院长基金(YZJJLX2019010)

通讯作者: ^*李晋锋,中国工程物理研究院材料研究所副研究员、硕士研究生导师。2015年清华大学材料学院材料科学与工程专业博士毕业后到中国工程物理研究院材料所工作至今。目前主要从事新型高熵合金设计、合金材料增材制造工艺等方面的研究工作。发表论文50余篇,包括Scripta Materialia、Journal of Alloys and Compounds、Journal of Materials Science & Technology、 Materials Science and Engineering: A等。

作者简介: 黄留飞,2021年7月获得工学硕士学位,现为新疆大学机械工程学院2021级博士研究生。目前在中国工程物理研究院材料研究所联合培养,主要从事高强韧高熵合金的激光增材制造及力学性能研究。

引用本文:

黄留飞, 王小英, 孙耀宁, 陈亮, 王龙, 任聪聪, 杨晓珊, 王斗, 李晋锋. 激光熔化沉积Al_xCoCrFeNi系高熵合金的组织与性能[J]. 材料导报, 2024, 38(6): 22090238-6.
HUANG Liufei, WANG Xiaoying, SUN Yaoning, CHEN Liang, WANG Long, REN Congcong, YANG Xiaoshan, WANG Dou, LI Jinfeng. Microstructure and Properties of Al_xCoCrFeNi High-entropy Alloys via Laser Melting Deposition. Materials Reports, 2024, 38(6): 22090238-6.

链接本文:

https://www.mater-rep.com/CN/10.11896/cldb.22090238 或 https://www.mater-rep.com/CN/Y2024/V38/I6/22090238

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