Exploring the influence of Nb content on high-temperature oxidation of NiTi shape memory alloys: Kinetics and Raman Spectroscopy study

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-26 DOI:10.1016/j.corsci.2025.113361

C.B. Martins Júnior , J.G.C. Passos , R. Silva , A.M. de Sousa Malafaia , A.G. Rodrigues , J.L. Smialek , B. Gleeson , C.A.D. Rovere

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Abstract

This study investigated the high-temperature oxidation kinetics of NiTi shape memory alloys containing 9, 10.5, and 12 at% Nb through isothermal oxidation at 800, 900 and 1000 °C in air for up to 100 h. The oxide scales were characterized by XRD, SEM/EDS and Raman Spectroscopy. Nb greatly improved oxidation resistance across all tested concentrations and temperatures. At 800 °C, all the ternary alloys showed similar mass gain during the exposure time. At 900 °C, the oxidation rate decreased with increasing Nb content up to 10.5 at% but increased again at 12 at%. At 1000 °C, all the alloys suffered scale growth and spallation. NiTi alloy oxide scale was composed of TiO₂ and NiTiO₃, while the NiTiNb alloys, in addition to these phases, exhibited TiNb₂O₇ and Ti₂O₃. Nb-enrichment of TiO₂ and the formation of Ti₂O₃ are likely responsible for the increased oxidation resistance of the ternary alloys.

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探讨铌含量对NiTi形状记忆合金高温氧化的影响：动力学和拉曼光谱研究

本研究研究了含9、10.5和12 （% Nb）的NiTi形状记忆合金在800、900和1000℃空气中恒温氧化100 h的高温氧化动力学。采用XRD、SEM/EDS和拉曼光谱对氧化膜进行了表征。Nb在所有测试浓度和温度下都大大提高了抗氧化性。在800℃时，所有三元合金在暴露时间内均表现出相似的质量增益。在900℃时，氧化率随着铌含量的增加而下降，铌含量达到10.5 （%）时，氧化率又上升到12 （%）时。在1000℃时，所有合金都发生了鳞片生长和剥落。NiTi合金氧化物垢主要由TiO2和NiTiO3组成，而NiTiNb合金除了这些相外，还含有TiNb2O7和Ti2O3。TiO2的富集和Ti2O3的形成可能是三元合金抗氧化能力增强的原因。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.