Isothermal oxidation of Ti–6Al–7Nb alloy

Aniołek, Krzysztof; Kupka, M.; Łuczuk, Marta; Barylski, Adrian

doi:10.1016/j.vacuum.2015.01.016

Cited by 33 publications

(21 citation statements)

References 23 publications

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“…After oxidation at 700°C, the grains of the formed oxides were clearly larger, consisting of numerous very fine particles of nanometric size. similar morphology of an oxide layer surface was observed in paper [17] in the case of a Ti6Al-7Nb alloy oxidised at temperatures of 600 and 700°C. However, scanning electron micrographs ( fig.…”

Section: Microstructure Of the As-delivered Materialssupporting

confidence: 81%

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Characteristic of Oxide Layers Obtained on Titanium in the Process of Thermal Oxidation

Aniołek¹,

Kupka²,

Barylski³

et al. 2016

Archives of Metallurgy and Materials

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Thermal oxidation in air may be one method to improve the properties of titanium and its alloys through its influence on the structure and properties of the material’s surface layer. This paper presents a description of oxide layers obtained on the surface of Grade 2 titanium as a result of oxidation at temperatures of 600 and 700°C. On the basis of kinetic curves, it was found that the intensity of oxide layer growth increased with oxidation temperature. Studies of the surface morphology of oxide layers showed that the size of the formed oxide particles was greater following oxidation at 600°C. The obtained layers were subjected to X-ray phase analysis and microhardness measurements. Irrespective of oxidation temperature, the scale consisted of TiO2 oxide in the crystallographic form of rutile and of Ti3O oxide. The hardness of oxide layers amounted to around 1265 HV and was more than 4 times higher compared to the material in i ts initial state.

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Section: Microstructure Of the As-delivered Materialssupporting

confidence: 81%

“…However, scanning electron micrographs ( fig. 7a, b, [17]) and the shape of kinetic curves (fig. 4, [17]) show that oxidation of the titanium alloy proceeded more slowly.…”

Section: Microstructure Of the As-delivered Materialsmentioning

confidence: 99%

Characteristic of Oxide Layers Obtained on Titanium in the Process of Thermal Oxidation

Aniołek¹,

Kupka²,

Barylski³

et al. 2016

Archives of Metallurgy and Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Aniołeket [27] and Hou Meng [28] investigated the oxidation behavior of Ti6Al7Nb and Ti6Al4V alloys in air at 600-800 . The value of oxidation rate for Ti6Al7Nb alloy ℃ was lower than that of Ti-6Al-4V alloy under the same oxidation conditions.…”

Section: Alloying Of Titanium and Titanium Alloysmentioning

confidence: 99%

High temperature oxidation behavior and research status of modifications on improving high temperature oxidation resistance of titanium alloys and titanium aluminides: A review

Dai

Zhu

Chen

et al. 2016

Journal of Alloys and Compounds

408

124

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“…According to the regression analysis of the curves in Figure 3, the values of the oxidation reaction index (n) were presented in Table 2. When n = 1, the oxidation kinetics curve followed the liner law, and if n = 2, the oxidation kinetics curve followed the parabolic law [21]. It can be seen that all the values of n are close to 2, and the corresponding coefficient of determination R 2 of n values are 0.996, 0.989, 0.995 and 0.995, respectively.…”

Section: Analysis Of Oxidation Kineticsmentioning

confidence: 84%

“…All the weight gains of Nb-added alloys are lower than that of Nb-free alloys, which shows that Nb can significantly improve the oxidation resistance. It also can be seen that the weight gain curves of the alloys follow a parabolic oxidation kinetic model, indicating that the oxidation process was controlled by diffusion [21]. The oxidation kinetics can be described by the Equation (1) [21,22]:…”

Section: Microstructurementioning

confidence: 85%

Effect of Nb Content on Cyclic Oxidation Behavior of As-Cast Ti-1100 Alloys

Song

Dong

et al. 2020

Materials

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The cyclic oxidation behaviors of the as-cast Ti-1100-xNb (x = 0.5, 1.0, 1.5, 2.0) alloys exposed at 650 • C for up to 100 h were systematically investigated. The aim of this work is to explore the in-depth oxidation mechanism by using the oxidation kinetics and the structure of the oxide products. The oxidation kinetics were determined by thermogravimetrically, and the microstructure and composition of the oxidation scale were studied by using XRD and SEM. The results demonstrate that Nb can significantly improve the oxidation resistance. However, the average weight gains of the alloys decrease firstly and then increase with the increase of Nb content. The oxidation kinetics obeys a parabolic model. The Ti-1100-1.0Nb alloy has the lowest k p value, which is 5.7 × 10 −13 g 2 cm −4 s −1 . The surface oxidation products are mainly composed of massive or acicular rutile-TiO 2 , Ti x O (x = 3, 6), NbO 2 and Al 2 O 3 . Besides, Al 2 (MoO 4 ) 3 oxide is also presented on the oxidation surface of the Ti-1100-1.5Nb alloys. Ti-1100-1.0Nb alloy shows the best oxidation resistance property revealed by combining weight gains and EDS-SEM element content profiles analysis. The interaction of Nb, O, Ti, and other elements retarded the diffusion of O atoms into the alloys, which improves the oxidation resistance. surface increases, even the TiO 2 particles dissolve [10]. Researches showed that the addition of 5-10 at.% Nb could improve the oxidation resistance of Ti-Al alloys [11,12]. The effects of Nb atoms on oxidation behavior could be summarized as [13][14][15][16]: (1) Nb replaced the Ti 4+ in TiO 2 , leading to a reduce of O 2− vacancy, which hampered the diffusion of O ion. (2) Nb could improve the activity of Al and promote the formation of the density Al 2 O 3 oxide film in TiO 2 oxide-layer, which can reduce the solubility of O atoms in oxide-layer. (3) Nb could reduce the solubility of O in α-Ti phase lattice. However, the solid solubility of Nb in titanium alloys is limited, and the interaction of Nb with Al, Sn, Zr, Mo, and Si in the Ti-1100 alloy can form the secondary phase and change the surface oxide structure [7]. With increasing Nb element, excessive Nb segregates in the grain boundary, which may result in the oxide scales cracking and high temperature oxidation resistance depreciation [8,17]. The content of Nb in the near α titanium alloy is usually between 0.7-1.0 wt.% [18], and the excess Nb content can be selected as 1.5 and 2.0 wt.%.Thus, the effect of Nb content (0.5, 1.0, 1.5, 2.0 wt.%) on cyclic oxidation behavior of as-cast Ti-1100 alloys was systematically investigated in this present work. The aim of this study is to explore the in-depth oxidation mechanism from the oxidation kinetics, surface oxidation products, and the cross-section oxidation layer elements distribution.

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Isothermal oxidation of Ti–6Al–7Nb alloy

Cited by 33 publications

References 23 publications

Characteristic of Oxide Layers Obtained on Titanium in the Process of Thermal Oxidation

Characteristic of Oxide Layers Obtained on Titanium in the Process of Thermal Oxidation

High temperature oxidation behavior and research status of modifications on improving high temperature oxidation resistance of titanium alloys and titanium aluminides: A review

Effect of Nb Content on Cyclic Oxidation Behavior of As-Cast Ti-1100 Alloys

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