Variation of microstructure and mechanical properties of NbMoVCr high-entropy alloy coatings doped silicon

IF 4.2 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials Pub Date : 2025-02-12 DOI:10.1016/j.ijrmhm.2025.107092

Jian Yang , Shenghui Lu , Jijun Yang

引用次数: 0

Abstract

NbMoVCrSi_x high-entropy alloy coatings with different Si contents were prepared, and the evolution in microstructure, mechanical properties, and wear behavior of the coatings was investigated comprehensively. The results showed that the coating structure transformed from the body-centered cubic phase to fully amorphous structure. With the trace Si doping, the hardness of the coating improved significantly, which was dominated by the effects of fine grain strengthening and solid solution strengthening. Meanwhile, the average friction coefficient and wear rate were decreased remarkably due to the improved hardness and toughness, and the formation of lubricating tribo-oxide layer containing SiO₂. However, when Si doping was excessive, the comprehensive properties of the coating deteriorated seriously due to the reduced hardness and limited deformation ability.

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掺硅NbMoVCr高熵合金涂层组织与力学性能的变化

制备了6种不同Si含量的nbmovcr6高熵合金涂层，并对其显微组织、力学性能和磨损性能的演变进行了全面研究。结果表明：涂层结构由体心立方相转变为完全非晶态结构；微量Si的掺入使涂层的硬度有了明显的提高，其中以细晶强化和固溶强化为主。同时，由于硬度和韧性的提高以及含有SiO2的润滑氧化摩擦层的形成，平均摩擦系数和磨损率显著降低。但当Si掺杂过量时，涂层的硬度降低，变形能力受限，综合性能严重恶化。

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

$International Journal of Refractory Metals & Hard Materials$

International Journal of Refractory Metals & Hard Materials 工程技术-材料科学：综合

CiteScore

7.00

自引率

13.90%

发文量

236

审稿时长

35 days

期刊介绍： The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.