为优化 TiCrNbTaW 高熵难熔合金的摩擦学特性而添加钛的研究

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Tribology International Pub Date : 2024-09-29 DOI:10.1016/j.triboint.2024.110290

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引用次数: 0

摘要

许多具有高熔点的难熔高熵合金（RHEAs）因成分偏析而出现严重的磨损断裂失效，这是限制其作为结构件广泛应用的一个关键因素。在这项工作中，采用成分调制和液相辅助烧结策略制备了两种新型 TixCrNbTaW（x = 1 和 1.5）RHEA。结果表明，钛的进一步添加增强了 RHEAs 的强度、韧性和微结构均匀性，从而有效抑制了磨损断裂行为。此外，原位形成的致密氧化无定形层具有比基体更高的硬度，可提供额外的承载能力。在上述因素的协同作用下，Ti1.5 合金的磨损率低至 2.9 × 10-5 mm3/（N-m）。本研究为高抗磨损 RHEA 的设计提供了一些启示。

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An investigation of Ti addition to optimize the tribological properties of TiCrNbTaW refractory high-entropy alloy

Many refractory high-entropy alloys (RHEAs) with high melting points suffer from severe wear-fracture failures due to compositional segregation, which is a key factor limiting their widespread application as structural parts. In this work, two novel Ti_xCrNbTaW (x = 1 and 1.5) RHEAs were prepared using composition modulation and liquid phase assisted sintering strategies. The results showed that the further addition of Ti enhanced the strength, toughness and microstructural homogeneity of the RHEAs, which effectively suppressed the wear-fracture behavior. In addition, the dense oxidized amorphous layer formed in-situ has higher hardness than the matrix, which can provide additional load-bearing capacity. The synergistic effect of the above factors promotes the wear rate of Ti1.5 alloy to be as low as 2.9 × 10⁻⁵ mm³/(N·m). The present work provides some insights into the design of high anti-wear RHEAs.

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来源期刊

Tribology International 工程技术-工程：机械

CiteScore

10.10

自引率

16.10%

发文量

627

审稿时长

35 days

期刊介绍： Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.