Effect of heat treatment on the interfacial element diffusion and hardness of FeCoNiCrAl high-entropy alloy coatings

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-11-30 DOI:10.1016/j.intermet.2024.108581

Yulin Ma , Xinyu Wang , Zhuang Li , Junjia Zhang , Jun Zhang

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Abstract

FeCoNiCrAl high-entropy alloy (HEA) coatings have here been prepared on Q235 steel by using the plasma spraying technology. The effects of heat treatment (300 °C, 400 °C, and 500 °C) on the coating phase, surface and cross section morphologies, surface Brinell hardness (HRB), cross section Vickers hardness (HV), and element diffusion at the coating interface, were then investigated. The distribution of pores, cracks, and unmelted particles on the surface of the coating was analyzed by scanning electron microscopy (SEM). The results showed that the BCC crystalline structure of the HEA coating did not change significantly after heat treatment at 300 °C, 400 °C, and 500 °C. In addition, the bonding between the coating and the matrix interface became significantly improved, and the cracks at the coating interface were eliminated. New oxides that filled the pores and cracks inside and at the interface of the coating were also observed as the temperature and holding time increased. Furthermore, the surface hardness of the Q235 steel was reduced as a result of the spray coating. However, this surface hardness was increased to HRB 85 (or even more) after heat treatment. Compared with the other samples, the coating sample that was heat-treated at 500 °C showed the best strength.

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热处理对FeCoNiCrAl高熵合金镀层界面元素扩散及硬度的影响

采用等离子喷涂技术在Q235钢表面制备了FeCoNiCrAl高熵合金（HEA）涂层。然后研究了热处理（300℃、400℃和500℃）对涂层相、表面和截面形貌、表面布氏硬度（HRB）、截面维氏硬度（HV）和涂层界面元素扩散的影响。利用扫描电子显微镜（SEM）分析了涂层表面孔隙、裂纹和未熔化颗粒的分布。结果表明，在300℃、400℃和500℃热处理后，HEA涂层的BCC晶体结构没有明显变化。此外，涂层与基体界面的结合得到明显改善，涂层界面处的裂纹得到消除。随着保温温度和保温时间的增加，涂层内部和界面处的孔隙和裂纹中也有新的氧化物填充。此外，喷镀还降低了Q235钢的表面硬度。然而，热处理后，表面硬度提高到hrb85（甚至更高）。与其他样品相比，500℃热处理的涂层样品表现出最好的强度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.