Atomic-scale investigation of the synergistic impact of Mo and Nb addition on enhancing the performance of laser cladding FeCoCrNi-based high entropy alloy coatings

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2024-07-25 DOI:10.1016/j.surfcoat.2024.131162

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引用次数: 0

Abstract

Utilizing synchronous powder feeding laser cladding technology, two high entropy alloy coatings, FeCoCrNiMo and FeCoCrNiMoNb, were deposited on the surface of low-carbon steel. An in-depth investigation into the synergistic interplay of Mo and Nb on FeCoCrNi-based high entropy alloy coatings was conducted. The findings reveal that FeCoCrNiMo comprises an FCC stable solid solution, Mo₃Co₃C, and Ni₃Mo₃C. Conversely, FeCoCrNiMoNb exhibits a composition comprising an FCC stable solid solution phase, NbC, and (Mo, Nb)C. This is attributed to the robust interaction between Mo and Nb, wherein Mo infiltrates the NbC lattice, substituting for a portion of Nb atoms. Notably, the synergistic influence of Mo diminishes the formation energy of NbC, thereby lessening the energy barrier encountered during the nucleation of (Mo, Nb)C. Consequently, the incorporation of Mo facilitates the precipitation of Nb. The refined microstructure and solid solution strengthening effect of (Nb, Mo)C and NbC, coupled with their elevated Vickers hardness and hard elastic ratio, contribute significantly to the notable enhancement in surface hardness and wear resistance observed in the FeCoCrNiMoNb high entropy alloy coating.

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添加钼和铌对提高激光熔覆铁钴铬镍基高熵合金涂层性能的协同影响的原子尺度研究

利用同步送粉激光熔覆技术，在低碳钢表面沉积了两种高熵合金镀层：FeCoCrNiMo 和 FeCoCrNiMoNb。对 Mo 和 Nb 在铁钴铬镍基高熵合金镀层上的协同作用进行了深入研究。研究结果表明，FeCoCrNiMo 由 FCC 稳定固溶体、MoCoC 和 NiMoC 组成。相反，FeCoCrNiMoNb 的成分则包括 FCC 稳定固溶体相、NbC 和 (Mo，Nb)C。这归因于钼和铌之间强有力的相互作用，其中钼渗入 NbC 晶格，取代了部分铌原子。值得注意的是，钼的协同作用降低了 NbC 的形成能，从而减少了（钼、铌）C 成核过程中遇到的能量障碍。因此，钼的加入促进了铌的沉淀。(Nb，Mo)C 和 NbC 精炼的微观结构和固溶强化效应，加上它们较高的维氏硬度和硬弹性比，大大提高了铁钴铬镍钼铌高熵合金涂层的表面硬度和耐磨性。

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

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.