Oxidation and tribological behavior of NbTiTa medium-entropy alloy and its self-lubricating composite at 900 °C

IF 6.1 1区工程技术 Q1 ENGINEERING, MECHANICAL

Wear Pub Date : 2025-07-16 DOI:10.1016/j.wear.2025.206246

Kaixuan Yu , Yushan Geng , Jun Cheng , Wenyuan Chen , Hui Tan , Shengyu Zhu , Kaifeng Zhang , Jun Yang

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引用次数: 0

Abstract

The complex elemental composition of high-entropy/medium-entropy alloys (HEAs/MEAs)-based composites presents challenges in understanding their tribological performance due to intricate oxidation mechanisms. In this work, the dynamic interplay between isothermal oxidation and tribo-oxidation (static-dynamic) was systematically examined at 900 °C. Particular attention was given to the roles of oxide nucleation kinetics and growth thermodynamics in determining tribo-layer stability. This study also investigated in detail the tribological mechanisms of the NbTiTa MEA and its self-lubricating composite (NbTiTa-5 %Ag-5 %CaF₂/BaF₂). The results indicate that the oxidation rate constants of the NbTiTa alloy and its self-lubricating composite were 1.03 × 10⁻⁸ g²cm⁻⁴s⁻² and 1.24 × 10⁻⁷ g²cm⁻⁴s⁻², respectively. Furthermore, the effect of counterparts (Si₃N₄ and Al₂O₃) on the tribological behavior was also systematically investigated. Both materials demonstrated relatively low wear rates (10⁻⁶ mm³/Nm) at 900 °C.

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900℃下NbTiTa中熵合金及其自润滑复合材料的氧化和摩擦学行为

高熵/中熵合金（HEAs/MEAs）基复合材料的元素组成复杂，由于其复杂的氧化机制，给了解其摩擦学性能带来了挑战。在这项工作中，系统地检查了900°C下等温氧化和摩擦氧化（静态-动态）之间的动态相互作用。特别注意了氧化物成核动力学和生长热力学在确定摩擦层稳定性中的作用。本研究还详细探讨了NbTiTa MEA及其自润滑复合材料（NbTiTa- 5% ag - 5% CaF2/BaF2）的摩擦学机理。结果表明：NbTiTa合金及其自润滑复合材料的氧化速率常数分别为1.03 × 10−8 g2cm−4s−2和1.24 × 10−7 g2cm−4s−2；此外，还系统地研究了对应物（Si3N4和Al2O3）对摩擦学行为的影响。两种材料在900°C时均表现出相对较低的磨损率（10 - 6 mm3/Nm）。

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来源期刊

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.