TiNbCr Multi-Principal Element Alloy Oxidation Behavior in Air at 800–1000 °C

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

Oxidation of Metals Pub Date : 2024-04-29 DOI:10.1007/s11085-024-10246-x

Isabela Dainezi, Brian Gleeson, Bruno Resende Buzatti, Artur Mariano de Sousa Malafaia, Carlos Alberto Della Rovere

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Abstract

The isothermal and cyclic oxidation behavior of a multi-principal element (MPE) TiNbCr alloy at 800–1000 °C in air was studied and compared to Co-based alloy 188. The phase constitution of the MPE alloy consisted of a Nb-rich body-centered cubic (BCC) matrix and Cr-rich Laves precipitates. While isothermal tests conducted at 800 °C led to the formation of a complex mixture of Nb, Ti and Cr oxides, tests at 900 and 1000 °C resulted in the formation of an innermost Cr₂O₃-rich scale layer which provided improved oxidation resistance. However, for all exposure temperatures, the scaling kinetics of the alloy were linear and therefore deemed non-protective. In contrast, alloy 188 exhibited parabolic scaling kinetics and smaller mass gain per area than the MPE alloy. The similarity between isothermal and cyclic test results for the MPE alloy confirmed that the scale does not offer much protection. Additionally, for all tests, there was extensive internal oxidation and nitridation.

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钛铌铬多元素合金在 800-1000 °C 空气中的氧化行为

研究了一种多主元素（MPE）TiNbCr 合金在 800-1000 °C 空气中的等温和循环氧化行为，并将其与 Co 基合金 188 进行了比较。MPE 合金的相组成包括富含铌的体心立方（BCC）基体和富含铬的拉维斯析出物。在 800 ℃ 下进行的等温试验形成了 Nb、Ti 和 Cr 氧化物的复杂混合物，而在 900 和 1000 ℃ 下进行的试验则形成了富含 Cr2O3 的最内层鳞片层，从而提高了抗氧化性。不过，在所有暴露温度下，合金的结垢动力学都是线性的，因此被认为不具有保护作用。相反，与 MPE 合金相比，合金 188 的缩放动力学呈抛物线型，单位面积质量增量较小。MPE 合金等温和循环测试结果的相似性证实，鳞片并不能提供多少保护。此外，在所有测试中，都出现了广泛的内部氧化和氮化现象。

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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.