Effect of Nb on oxidation behavior of high Nb containing TiAl alloys

Lin, Junpin; Zhao, Liming; Li, G.Y.; Zhang, L.Q.; Song, Xiping; Ye, F.; Chen, G.L.

doi:10.1016/j.intermet.2010.08.029

Cited by 228 publications

(75 citation statements)

References 18 publications

(7 reference statements)

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“…EDS results from different positions in cross-sections in Figure 8d are also listed in Table 6. It was confirmed that the substrate was oxidized and that the oxidized scale possessed a triple-layer structure: an inner Nb-enriched, TiO 2 -enriched, and Al 2 O 3 -enriched layer [5]. The oxide layer of substrate A2 was clearly thicker than that of E3, which agreed with oxidation results (Figure 7).…”

Section: Characterization Of Samples After Oxidationsupporting

confidence: 80%

“…EDS analysis of different positions on the cross-section in Figure 8d. XRD patterns of an uncoated sample (pattern a) and Al 2 O 3 -coated samples treated in aqueous solution (pattern b) and ethanolic solution (pattern c) after oxidation (Figure 9), which showed that oxidized scale of uncoated samples was mainly composed of α-Al 2 O 3 and TiO 2 [5]. The α-Al 2 O 3 and TiO 2 of patterns b and c also originated from substrate scales.…”

Section: Characterization Of Samples After Oxidationmentioning

confidence: 99%

“…At high temperature, the oxidation resistance of high Nb-containing (up to 10 at %) TiAl alloys is much higher compared with that of other TiAl alloys [4,5]. Hence, Ti-45Al-8.5Nb alloys have been chosen for use in engines working at 800-900 • C [5]. Nevertheless, non-protective Al 2 O 3 + TiO 2 scale has been observed to grow rapidly on these alloys at high temperatures, which limits their applications [6,7].…”

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Solvent and Electrical Voltage on Cathode Plasma Electrolytic Deposition of Al2O3 Antioxidation Coatings on Ti-45Al-8.5Nb Alloys

Yang

Jiang

Ding

et al. 2018

Metals

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Al 2 O 3 coatings were prepared on Ti-45Al-8.5Nb alloys via cathodic plasma electrolysis deposition (CPED) in both 1.2 M Al(NO 3 ) 3 aqueous and ethanolic solutions. Different voltages were also applied during the deposition process to optimize coating properties. Coatings deposited in both solutions mainly consisted of γ-Al 2 O 3 , with some Al(OH) 3 found in coatings prepared in aqueous solution. Coatings prepared in ethanol solution exhibited better oxidation resistance at 900 • C as well as better substrate adhesion, which was mainly due to smaller crater sizes on coating surfaces. The deposition process was discussed in detail and the reason for the smaller craters examined. The results suggested that solution surface tension mainly influenced the average diameter of hydrogen bubbles that formed on cathode surfaces during the process. Smaller bubbles lead to both lower current densities on cathodes and smaller crater sizes on coatings.

show abstract

Section: Characterization Of Samples After Oxidationsupporting

confidence: 80%

Section: Characterization Of Samples After Oxidationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influence of Solvent and Electrical Voltage on Cathode Plasma Electrolytic Deposition of Al2O3 Antioxidation Coatings on Ti-45Al-8.5Nb Alloys

Yang

Jiang

Ding

et al. 2018

Metals

View full text Add to dashboard Cite

show abstract

“…The oxidation rate of TiAl-based alloys can be lowered by additions such as niobium, tungsten, molybdenum, tantalum, chromium, hafnium, and silicon [4,5,9,[11][12][13]. The most effective of the The investigated alloy was prepared from the commercial pure Ti (Grade 1), as well as Al, Nb, C, and B, which were added accordingly as Al-Nb master alloy, anthracite, and crystalline boron.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Aluminizing Process on the Surface Condition and Oxidation Resistance of Ti–45Al–8Nb–0.5(B, C) Alloy

et al. 2018

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Abstract:One of the major barriers limiting the suitability of TiAl intermetallic alloys for use in the demanding aircraft and automotive industries is their susceptibility to degradation as a result of oxidation at temperatures exceeding 760 • C. Paper presents the characteristics of resistance to cyclic oxidation at 950 • C for Ti-45Al-8Nb-0.5(B, C) alloy with and without protective coating obtained as a result of aluminizing using out of pack method. The characteristics of surface condition were determined by scanning electron microscope with EDS system, transmission electron microscope, and X-ray diffractometer. The favorable behavior of the Ti-45Al-8Nb-0.5(B, C) alloy with a protective coating under cyclic oxidation conditions is a result of a higher content of Al 2 O 3 in the microstructure of the scale and the presence of Al and Nb-rich phases at the substrate interface, which probably constitue a barrier for oxidation process. The high temperature oxidation test revealed that aluminide coating was responsible for a remarkable improvement in the oxidation resistance.

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Alloy Design Concepts for Wrought High Temperature TiAl Alloys

Lin

Zhang

et al. 2014

Gamma Titanium Aluminide Alloys 2014

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Wrought TiAl alloys provide more possibility to control the microstructure and give a balanced mechanical properties than cast alloy. Titanium aluminides based on the general composition Ti-45Al-(6-9)Nb (in at.%) exhibit several desired properties for higher temperature applications. N b addition changes the Ti-Al phase diagram and the segregations of N b and other elements are easy to form, which induces formation of B2 phase. B2 phase worsens the mechanical properties at both room temperature and elevated temperatures. The new idea is that the P phase is can be used to improve the hot-workability, and the segregations can be lightened during the deformation and finally disappeared, so stable B2 phase is avoided at room temperature. Otherwise, high Nb addition significantly reduces the stalking fault energy (SFE), resulting in abundant twinning and twin intersections, which plays an important role for accommodating heterogeneous deformation and avoiding formation of microcrack at boundaries. The basic compositional characteristics of the high temperature TiAl alloys are high Nb and low A1 content, typically 6/9 N b and 44-46A1. Carefully microalloying using the elements B, W, Y , C may further optimize the properties of the alloys. These wrought alloys have excellent oxidation resistance, balanced mechanical properties and good workability.

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Effect of Nb on oxidation behavior of high Nb containing TiAl alloys

Cited by 228 publications

References 18 publications

Influence of Solvent and Electrical Voltage on Cathode Plasma Electrolytic Deposition of Al2O3 Antioxidation Coatings on Ti-45Al-8.5Nb Alloys

Influence of Solvent and Electrical Voltage on Cathode Plasma Electrolytic Deposition of Al2O3 Antioxidation Coatings on Ti-45Al-8.5Nb Alloys

The Influence of Aluminizing Process on the Surface Condition and Oxidation Resistance of Ti–45Al–8Nb–0.5(B, C) Alloy

Alloy Design Concepts for Wrought High Temperature TiAl Alloys

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