Phase compositions and properties of NbMoTaVTi refractory high-entropy alloy coating on Ti-6Al-4V alloy

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL Intermetallics Pub Date : 2025-01-07 DOI:10.1016/j.intermet.2025.108642

Dong Lu , Chao Wang , Jianhong Peng

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Abstract

To improve the properties of TC4 alloy, NbMoTaVTi refractory high-entropy alloy coating without defects was successfully prepared on the surface of TC4 alloy by laser cladding method. Phase compositions and properties were investigated through various characterization methods. The coating exhibited a dual-phase structure of BCC and HCP. SEM and EDS showed that the coating formed an excellent metallurgical bond with the TC4 substrate and had a small heat-affected zone. The microhardness of the coating was 600.62 HV, which was 57.63 % higher than the microhardness of the substrate. High-temperature experiments at 1000 °C, 1100 °C, 1200 °C revealed that the coating had better oxidation resistance at high temperatures. An electrochemical experiment in 3.5 wt% NaCl solution showed that the passive film's stability on the coating's surface was improved. The corrosion rates of the substrate and coating were 258.10 × 10⁻³ mpy and 87.79 × 10⁻³ mpy, respectively, indicating that the coating had better corrosion resistance.

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Ti-6Al-4V合金上NbMoTaVTi耐火高熵合金涂层的相组成及性能

为了提高TC4合金的性能，采用激光熔覆方法在TC4合金表面成功制备了NbMoTaVTi无缺陷高熵合金涂层。通过各种表征方法研究了其相组成和性能。涂层呈现出BCC和HCP的双相结构。SEM和EDS表明，涂层与TC4基体形成了良好的冶金结合，热影响区小。镀层的显微硬度为600.62 HV，比基体的显微硬度高57.63%。在1000°C、1100°C、1200°C的高温实验中，涂层具有较好的高温抗氧化性能。在3.5 wt% NaCl溶液中进行的电化学实验表明，钝化膜在涂层表面的稳定性得到了提高。基体和涂层的腐蚀速率分别为258.10 × 10−3 mpy和87.79 × 10−3 mpy，表明该涂层具有较好的耐蚀性。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.