利用火花等离子烧结技术实现原位陶瓷相增强 NbMoWTa 难熔高熵合金复合材料的优异耐磨性

IF 5.3 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Wear Pub Date : 2024-09-10 DOI:10.1016/j.wear.2024.205572
Xuhui Pei , Yin Du , Hanming Wang , Mingchuan Hu , Yuehui Li , Wei Zhou , Haifeng Wang
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引用次数: 0

摘要

难熔高熵合金(RHEAs)作为航空航天设备的结构部件具有巨大潜力。然而,它们缺乏耐磨性以及在室温(RT)下摩擦系数增大的问题限制了它们的实际应用。因此,需要进一步改进它们在室温下的摩擦和磨损性能。在此背景下,本研究开发的 NbMoWTa(h-BN)x RHEA 陶瓷复合材料为解决这一问题提供了可行的解决方案。实验结果表明,h-BN 的加入导致了 (Nb,Ta)N/(Nb,Ta)2N 和 (Nb,Ta)B2 陶瓷相的原位生成,显著提高了复合材料的硬度和耐磨性。NbMoWTa(h-BN)0.5 的磨损率低至 1.32 × 10-8 mm3/Nm,比 RHEA 低四个数量级。NbMoWTa RHEA 表现出明显的粘着磨损,通过均匀分散具有较低平均自由路径的陶瓷相颗粒,可有效减轻复合材料中的粘着磨损。磨料颗粒主要与硬质强化相相互作用,有效抑制了其附近的塑性变形。因此,陶瓷相之间平均自由路径的减少限制了金属基体去除的可能性。随后,在陶瓷相的帮助下,自发形成的保护性第三体进一步抑制了表面材料的去除,最终确保了优异的耐磨性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Attaining exceptional wear resistance in an in-situ ceramic phase reinforced NbMoWTa refractory high entropy alloy composite by Spark plasma sintering

The refractory high-entropy alloys (RHEAs) exhibit great potential as structural components for aerospace equipment. However, their lack of wear resistance and increased coefficient of friction at room temperature (RT) impose limitations on their practical applications. Therefore, further enhancements are required to improve their friction and wear properties under RT. In this context, the development of NbMoWTa(h-BN)x RHEA ceramic composites in this work offers a viable solution to address this issue. Experimental results demonstrate that the addition of h-BN leads to the in-situ generation of (Nb,Ta)N/(Nb,Ta)2N and (Nb,Ta)B2 ceramic phases, significantly enhancing the hardness and wear resistance of the composites. The wear rate of NbMoWTa(h-BN)0.5 reaching as low as 1.32 × 10−8 mm3/Nm, which is four orders of magnitude lower than that of the RHEA. The NbMoWTa RHEA exhibits significant adhesive wear, which can be effectively mitigated in composites through the uniform dispersion of ceramic phase particles with lower mean free path. The abrasive particles primarily interact with the hard strengthening phase, effectively inhibiting plastic deformation in their vicinity. Consequently, the reduced mean free path between the ceramic phases limits the likelihood of metal matrix removal. Subsequently, aided by the presence of ceramic phases, the spontaneous formation of protective third bodies further inhibit surface material removal and ultimately ensures exceptional wear resistance.

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来源期刊
Wear
Wear 工程技术-材料科学:综合
CiteScore
8.80
自引率
8.00%
发文量
280
审稿时长
47 days
期刊介绍: Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.
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