Microstructure and Properties of AlCoCrFeNi2.1 Eutectic High-Entropy Alloy Coatings Fabricated by Extreme High-Speed and Conventional Laser Cladding

IF 3.2 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Journal of Thermal Spray Technology Pub Date : 2024-02-23 DOI:10.1007/s11666-024-01734-2

Jia Wang, Yang Li, Bingwen Lu, Jin Liu, Na Tan, Yujie Zhou, Yujun Cai, Zichuan Lu

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Abstract

AlCoCrFeNi_2.1 eutectic high-entropy alloys (HEAs) are a new kind of alloy with high entropy and eutectic properties. Their advantages in terms of strength and shape matching can be fully exploited using extreme high-speed laser cladding (EHLA). In this paper, AlCoCrFeNi_2.1 eutectic HEA coatings were prepared by conventional laser cladding (CLA) and EHLA. The microstructures and phase compositions of the two coatings were analyzed by scanning electron microscopy, x-ray diffraction, and electron backscatter diffraction. The microhardness and wear resistance values of the coatings were tested using a microhardness tester and a friction and wear tester, respectively. The results showed that the surface qualities of both the CLA and EHLA coatings were good and had no cracks or defects. Compared with those of the CLA coating, the EHLA coating had finer grains and a more uniform distribution. Both coatings contained face-centered cubic (FCC) and body-centered cubic (BCC) phases, but the BCC phase of the EHLA coating was less precipitated than the CLA coating. The higher microhardness and better wear resistance of the EHLA coatings occurred in the presence of Hall–Petch strengthening.

Graphical Abstract

Abstract Image

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采用极高速和传统激光熔覆技术制造的 AlCoCrFeNi2.1 共晶高熵合金涂层的显微结构和性能

AlCoCrFeNi2.1 共晶高熵合金（HEAs）是一种具有高熵和共晶特性的新型合金。利用极高速激光熔覆技术（EHLA）可以充分发挥其在强度和形状匹配方面的优势。本文采用传统激光熔覆（CLA）和 EHLA 制备了 AlCoCrFeNi2.1 共晶 HEA 涂层。通过扫描电子显微镜、X 射线衍射和电子反向散射衍射分析了两种涂层的微观结构和相组成。使用显微硬度计和摩擦磨损测试仪分别测试了涂层的显微硬度和耐磨值。结果表明，CLA 和 EHLA 涂层的表面质量都很好，没有裂缝或缺陷。与 CLA 涂层相比，EHLA 涂层的颗粒更细，分布更均匀。两种涂层都含有面心立方（FCC）相和体心立方（BCC）相，但 EHLA 涂层中 BCC 相的析出量比 CLA 涂层少。在霍尔-佩奇强化作用下，EHLA涂层具有更高的显微硬度和更好的耐磨性。

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来源期刊

Journal of Thermal Spray Technology 工程技术-材料科学：膜

CiteScore

5.20

自引率

25.80%

发文量

198

审稿时长

2.6 months

期刊介绍： From the scientific to the practical, stay on top of advances in this fast-growing coating technology with ASM International''s Journal of Thermal Spray Technology. Critically reviewed scientific papers and engineering articles combine the best of new research with the latest applications and problem solving. A service of the ASM Thermal Spray Society (TSS), the Journal of Thermal Spray Technology covers all fundamental and practical aspects of thermal spray science, including processes, feedstock manufacture, and testing and characterization. The journal contains worldwide coverage of the latest research, products, equipment and process developments, and includes technical note case studies from real-time applications and in-depth topical reviews.