Effects of aging on microstructure and wear resistance of laser cladding Mo0.5NbTiVCr0.25 high-entropy alloy coating

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2024-07-01 DOI:10.1016/S1003-6326(24)66536-2

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Abstract

Refractory Mo_0.5NbTiVCr_0.25 high-entropy alloy coatings were fabricated on TC4 substrates using laser cladding technology. The coatings were aged at 600, 800 and 1000 °C for 24 h and then water-cooled. The phase composition, microstructure, and mechanical properties of the high-entropy alloy coatings were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), electron backscattered diffraction (EBSD), transmission electron microscopy (TEM), Vickers hardness testing and universal friction wear testing. The results showed that high-entropy alloy coatings retained a body-centered cubic structure after different aging heat treatments. After the aging heat treatment at 800 °C, the coatings exhibited Ti-rich precipitation phases, which were verified as Ti(O,N) face-centered cubic structures by TEM technique. The optimum aging temperature was 600 °C and the hardness of the coating was HV_0.2 410. The wear mechanisms of the coatings were adhesive and abrasive wear.

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时效对激光熔覆 Mo0.5NbTiVCr0.25 高熵合金涂层微观结构和耐磨性的影响

采用激光熔覆技术在 TC4 基材上制作了难熔 Mo0.5NbTiVCr0.25 高熵合金涂层。涂层分别在 600、800 和 1000 °C 下老化 24 小时，然后水冷。使用 X 射线衍射 (XRD)、扫描电子显微镜 (SEM)、电子背散射衍射 (EBSD)、透射电子显微镜 (TEM)、维氏硬度测试和通用摩擦磨损测试研究了高熵合金涂层的相组成、微观结构和机械性能。结果表明，高熵合金涂层在经过不同的时效热处理后仍保持体心立方结构。在 800 °C 老化热处理后，镀层出现了富钛析出相，经 TEM 技术验证为 Ti(O,N) 面心立方结构。最佳老化温度为 600 ℃，涂层硬度为 HV0.2 410。涂层的磨损机制为粘着磨损和磨料磨损。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.