Oxidation behaviour of Ti-V-Cr-Nb-Ta and Al-Ti-V-Cr-Ta refractory high entropy alloys: Effects of Nb and Al substitutions

IF 7.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design Pub Date : 2024-10-01 DOI:10.1016/j.matdes.2024.113370

Kieran Rivers , Bradley Young , Yuanbo T. Tang , Bo-Shiuan Li , Angus J. Wilkinson , David E.J. Armstrong , Junliang Liu

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Abstract

Refractory high entropy alloys (RHEAs) are candidate materials for nuclear and other high-temperature applications, due to their high-temperature strength, good irradiation resistance, and high melting temperatures. However, a significant issue with current RHEAs is that those exhibiting good mechanical properties tend to show poor oxidation resistance, and vice versa. In this paper, the oxidation kinetics of four RHEAs (20Ti-20V-20Cr-20Nb-20Ta, 25Ti-25V-5Cr-20Nb-25Ta, 20Al-20Ti-20V-20Cr-20Ta, and 14Al-24Ti-24V-14Cr-24Ta alloys) were investigated in an air atmosphere at 1000 °C. As-prepared and oxidised samples were characterised by a combination of state-of-the-art microscopy techniques. By replacing Nb with Al, the two Al-containing alloys were observed to form a less porous oxide microstructure, showing significant improvement in their oxidation resistance. As a result of oxygen/nitrogen ingress during oxidation and associated phase-segregation at high temperatures, the hardness of the underlying metal matrix of the RHEAs increased by approximately 5 GPa.

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Ti-V-Cr-Nb-Ta 和 Al-Ti-V-Cr-Ta 难熔高熵合金的氧化行为：铌和铝替代的影响

难熔高熵合金（RHEAs）具有高温强度、良好的抗辐照性能和较高的熔化温度，是核及其他高温应用的候选材料。然而，目前 RHEAs 存在的一个重要问题是，具有良好机械性能的 RHEAs 往往抗氧化性较差，反之亦然。本文研究了四种 RHEA（20Ti-20V-20Cr-20Nb-20Ta、25Ti-25V-5Cr-20Nb-25Ta、20Al-20Ti-20V-20Cr-20Ta 和 14Al-24Ti-24V-14Cr-24Ta）在 1000 ℃ 空气环境中的氧化动力学。结合最先进的显微镜技术对制备的和氧化的样品进行了表征。通过用铝代替铌，观察到这两种含铝合金形成了孔隙较少的氧化物微观结构，从而显著提高了其抗氧化性。由于氧化过程中氧/氮的侵入以及高温下相关的相分离，RHEAs 底层金属基体的硬度增加了约 5 GPa。

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

Materials & Design Engineering-Mechanical Engineering

CiteScore

14.30

自引率

7.10%

发文量

1028

审稿时长

85 days

期刊介绍： Materials and Design is a multi-disciplinary journal that publishes original research reports, review articles, and express communications. The journal focuses on studying the structure and properties of inorganic and organic materials, advancements in synthesis, processing, characterization, and testing, the design of materials and engineering systems, and their applications in technology. It aims to bring together various aspects of materials science, engineering, physics, and chemistry. The journal explores themes ranging from materials to design and aims to reveal the connections between natural and artificial materials, as well as experiment and modeling. Manuscripts submitted to Materials and Design should contain elements of discovery and surprise, as they often contribute new insights into the architecture and function of matter.