The Behavior of Al0.5CoCrFeNiCuPt0.3 High-Entropy Alloy During High-Temperature Oxidation

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Oxidation of Metals Pub Date : 2024-05-12 DOI:10.1007/s11085-024-10248-9

Olga Samoilova, Ilsiya Suleymanova, Nataliya Shaburova, Ahmad Ostovari Moghaddam, Evgeny Trofimov

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Abstract

The quest for high-entropy alloys (HEAs) with superior resistance against oxidation at elevated temperatures is one of the urgent problems in materials society, since HEAs are candidates for coating machinery parts operating in aggressive conditions (such as turbine blades, turbojet and jet engines, etc.). In this study, the effect of minor platinum alloying on the microstructure, phase composition and high-temperature oxidation resistance of Al_0.5CoCrFeNiCuPt_0.3 HEA was studied. It was demonstrated that platinum does not precipitate as an intermetallic phases; rather, it dissolves in the solid solution phases. High-temperature oxidation tests were carried out in a muffle furnace at 900 °C and 1000 °C for 50 h in air. It was found out that platinum alloying significantly increases oxidation resistance of Al_0.5CoCrFeNiCuPt_0.3 HEA at elevated temperatures with specific weight change of 0.139 mg/cm² and 0.238 mg/cm² after 50 h of isothermal exposure to 900 °C and 1000 °C, respectively. A dense oxide layer, mainly composed of Al₂O₃, without defects and pores protected the surface of the alloy.

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Al0.5CoCrFeNiCuPt0.3 高熵合金在高温氧化过程中的行为

由于高熵合金是在侵蚀性条件下工作的机械部件（如涡轮叶片、涡轮喷气发动机和喷气发动机等）的涂层候选材料，因此寻求具有优异高温抗氧化性的高熵合金（HEAs）是材料界亟待解决的问题之一。在这项研究中，研究了少量铂合金化对 Al0.5CoCrFeNiCuPt0.3 HEA 的微观结构、相组成和高温抗氧化性的影响。结果表明，铂不会以金属间相的形式析出，而是溶解在固溶相中。在马弗炉中进行了高温氧化试验，空气温度分别为 900 °C 和 1000 °C，时间为 50 小时。结果发现，铂合金化能显著提高 Al0.5CoCrFeNiCuPt0.3 HEA 在高温下的抗氧化性，在 900 °C 和 1000 °C 等温暴露 50 小时后，比重变化分别为 0.139 mg/cm2 和 0.238 mg/cm2。合金表面有一层致密的氧化层，主要由 Al2O3 组成，没有缺陷和气孔。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

期刊介绍： Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.