Failure analysis of TiNbCr Multi-Principal element Alloy: Temperature-Dependent oxidation and internal degradation in oxygen atmospheres

被引：0
作者：
Dainezi, Isabela [1 ,2 ,3 ]
Gleeson, Brian [4 ]
Della Rovere, Carlos Alberto [1 ,2 ]
机构：
[1] Federal University of Sao Carlos, Graduate Program in Materials Science and Engineering, Rodovia Washington Luiz, km 235 SP-310, São Paulo, São Carlos
[2] Federal University of Sao Carlos, Department of Materials Engineering, Rodovia Washington Luiz, km 235 SP-310, São Paulo, São Carlos
[3] Materials and Corrosion, DECHEMA Research Institute, Theodor-Heuss-Allee 25, Frankfurt am Main
[4] Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, 15261, PA
来源：
Engineering Failure Analysis | 2025年 / 175卷
基金：
巴西圣保罗研究基金会;
关键词：
Complex oxides; High-temperature failure; Multi-principal element alloy; Oxidation mechanism; Refractory elements; Scaling process;
D O I：
10.1016/j.engfailanal.2025.109573
中图分类号：
学科分类号：
摘要：
This study presents a failure analysis of a TiNbCr multi-principal element (MPE) alloy, focusing on its temperature-dependent oxidation behavior and internal degradation mechanisms in oxygen atmospheres. Thermal gravimetric analysis (TGA) conducted at varying temperatures revealed distinct oxidation mechanism: at 700 °C, a dense oxide layer formed; at 800 °C, a complex mixture of Nb, Ti, and Cr oxides was observed; and at 900 and 1000 °C, an innermost Cr2O3-rich layer developed, imparting improved oxidation resistance. Despite these temperature-dependent variations, the scaling kinetics of the alloy remained linear, with extensive internal oxidation observed at all exposure temperatures. In contrast, alloy 188 exhibited parabolic scaling kinetics and lower mass gain per unit area, demonstrating better oxidation resistance. The persistent presence of an internal reaction zone (IRZ) suggests that the oxide scale fails to act as an effective diffusion barrier, promoting internal degradation and increasing the risk of structural failure in high-temperature applications. Moreover, a comparison with previous studies suggests that the presence of nitrogen accelerates oxidation kinetics while reducing IRZ depth, affecting long-term material stability. These findings provide critical insights into oxidation-induced failure mechanisms, aiding in the development and selection of high-temperature alloys for aerospace, energy, and structural applications. © 2025 Elsevier Ltd
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