Characterization of microstructures and oxidation behaviour of Nb–20Si–20Cr–5Al alloy

Alvarez, David; Varma, S. K.

doi:10.1016/j.corsci.2011.02.038

Cited by 25 publications

(7 citation statements)

References 18 publications

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“…7, it is noted that the cavities existed in Alloy A are more and bigger than those in Alloy B. Because of the lower relative amounts of CrNbO 4 and higher stress in Alloy A [19], as mentioned above, the oxidation products in Region 2 peel off, so the cavities in this alloy are more and bigger than the other one. This can be attributed to the fact that the oxidation products in Region 2 of Alloy A peel off due to the lower relative amounts of CrNbO 4 and higher stress in Alloy A.…”

Section: Surface Morphologiesmentioning

confidence: 90%

Oxidation behavior of Nb–24Ti–18Si–2Al–2Hf–4Cr and Nb–24Ti–18Si–2Al–2Hf–8Cr hypereutectic alloys at 1250 °C

et al. 2015

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Nb-24Ti-18Si-2Al-2Hf-4Cr and Nb-24Ti-18Si-2Al-2Hf-8Cr alloys were prepared by arc melting in a water-cooled crucible under argon atmosphere. Microstructural characteristics and oxidation resistance of the alloys at 1250°C were investigated. The results show that, when the Cr content is 4 at%, the microstructures consist of (Nb,Ti) SS and Nb 5 Si 3 ; as Cr content increases to 8 at%, C14 Laves phase Cr 2 Nb is formed. The isothermal oxidation tests show that the oxidation kinetics of the two alloys follow similar features. The weight gains of the two alloys after oxidation at 1250°C for 100 h are 235.61 and 198.50 mgÁcm -2 , respectively. During oxidation, SiO 2 , TiO 2 , Nb 2 O 5 and CrNbO 4 are formed at first. Then, Ti 2 Nb 10 O 29 is formed after oxidation for 20 min and begins to change into TiNb 2 O 7 as the oxidation proceeds. SiO 2 is formed as solid state at first but later evolves into glassy state to improve the cohesion of the scale. After oxidation for 100 h, oxidation products consist of SiO 2 , TiNb 2 O 7 , Nb 2 O 5 and CrNbO 4 .

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Section: Surface Morphologiesmentioning

confidence: 90%

Oxidation behavior of Nb–24Ti–18Si–2Al–2Hf–4Cr and Nb–24Ti–18Si–2Al–2Hf–8Cr hypereutectic alloys at 1250 °C

et al. 2015

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“…The formation of Nb 2 O 5 involves significant volume expansion of 169% [22]. The voluminous oxides can create high compressive stresses that crack the oxide layer and expose a new surface area [23], resulting in the spallation of oxide scale. Besides, no SiO 2 appears in the oxide scale.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

“…Therefore, it is necessary to promote the formation of a protective oxide layer on the surface of Nb-Si based alloys. Extensive studies have shown that the oxidation resistance of Nb-Si based alloys can be improved significantly with the addition of Cr, Si, Al, Ti and Hf [2][3][4][9][10][11][12]. Alloying with B can be beneficial to the oxidation resistance [13].…”

Section: Introductionmentioning

confidence: 98%

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Improvement in the oxidation resistance of Nb–Ti–Si–Cr–Al–Hf alloys containing alloyed Ge and B

Jia

Weng

et al. 2014

Corrosion Science

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“…However, the oxidation performance of Nb-Si-based alloys is a major drawback that has hindered their application [7][8][9]. Nb-Si-based alloys show serious levels of oxidation at both high (1000-1300 • C) and intermediate (600-900 • C) temperatures.…”

Section: Introductionmentioning

confidence: 99%

The Oxidation Resistance of Nb-Si-Based Alloys at Intermediate and High Temperatures

et al. 2020

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The oxidation behavior of three Nb-Si-based alloys were evaluated at intermediate (800 °C) and high (1250 °C) temperatures for 100 h in air. At 800 °C, the Nb-24Ti-15Si-13Cr-2Al-2Hf (at. %) alloy suffered from catastrophic pest oxidation. This pest phenomenon was suppressed by the addition of Sn. However, Ta addition protected the Nb-Si-based alloys from pest oxidation for a short time. At 1250 °C, Sn could enhance the oxidation resistance of Nb-Si-based alloys due to the formation of a Sn-rich layer. In addition, the oxidation mechanisms of Nb-Si-based alloys at intermediate and high temperatures were discussed.

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Characterization of microstructures and oxidation behaviour of Nb–20Si–20Cr–5Al alloy

Cited by 25 publications

References 18 publications

Oxidation behavior of Nb–24Ti–18Si–2Al–2Hf–4Cr and Nb–24Ti–18Si–2Al–2Hf–8Cr hypereutectic alloys at 1250 °C

Oxidation behavior of Nb–24Ti–18Si–2Al–2Hf–4Cr and Nb–24Ti–18Si–2Al–2Hf–8Cr hypereutectic alloys at 1250 °C

Improvement in the oxidation resistance of Nb–Ti–Si–Cr–Al–Hf alloys containing alloyed Ge and B

The Oxidation Resistance of Nb-Si-Based Alloys at Intermediate and High Temperatures

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