Isothermal Oxidation Behavior of Ti-50Al Alloy with Y Additions at 800 and 900°C

Wu, Ying; Umakoshi, Yukichi; Li, X. W.; Narita, Toshio

doi:10.1007/s11085-006-9038-6

Cited by 23 publications

(5 citation statements)

References 47 publications

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“…A similar effect was observed with yttrium promoting the formation of an alumina scale on c-TiAl [21,22]. Addition of 0.3 at.% Y improved the oxidation resistance of TiAl-based alloys at 800 8C and 900 8C [23]. The high oxidation resistance provided by the yttrium addition was mainly related to the formation of a continuous Al 2 O 3 layer in the outer scale, retarding inward diffusion of oxygen.…”

Section: Introductionsupporting

confidence: 64%

Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys

Braun

Fröhlich

Leyens

2010

International Journal of Materials Research

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TiAl-based intermetallic layers with additions of Ag, Cr, Y and Hf were deposited on c-TiAl specimens using magnetron sputtering. The oxidation behaviour of the coated Ti-45Al-8Nb (at.%) alloy was investigated at 850 8C and 900 8C under cyclic oxidation conditions in air. The ternary Ti-50Al-2Ag (at.%) coating did not provide oxidation protection to the substrate material at 850 8C. Two-phase c-TiAl + Ti(Cr, Al) 2 Laves coatings exhibited high oxidation resistance at 900 8C for up to 1000 cycles of 1 h dwell time at high temperature. During thermal exposure phase dissolution and transformation occurred. The slow oxide growth rates observed for the Ti -Al -Cr intermetallic layers were associated with the formation of a thin continuous alumina top scale established by the Laves, B2 and Z-phases. Small additions of hafnium and yttrium improved the oxidation resistance. In contrast, Ti -Al -Cr -Ag coatings exhibited poor oxidation behaviour at 900 8C. R. Braun et al.: Oxidation behaviour of TiAl-based intermetallic coatings on c-TiAl alloys Int.

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Section: Introductionsupporting

confidence: 64%

Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys

Braun

Fröhlich

Leyens

2010

International Journal of Materials Research

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“…Moreover, Y can also inhibit ion diffusion in grain boundaries and decrease the oxidescale growth rate [117][118][119]. The presence of Y improves the adhesion between oxide film and substrate, thus improving the alloyed oxidation resistance [120,121]. Therefore, researchers try to add the Y element to Mo-Si-B alloys to obtain materials with better performance.…”

Section: Effects Of Y Element Additionmentioning

confidence: 99%

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Wang

et al. 2021

Coatings

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Traditional refractory materials such as nickel-based superalloys have been gradually unable to meet the performance requirements of advanced materials. The Mo-Si-based alloy, as a new type of high temperature structural material, has entered the vision of researchers due to its charming high temperature performance characteristics. However, its easy oxidation and even “pesting oxidation” at medium temperatures limit its further applications. In order to solve this problem, researchers have conducted large numbers of experiments and made breakthrough achievements. Based on these research results, the effects of rare earth elements like La, Hf, Ce and Y on the microstructure and oxidation behavior of Mo-Si-based alloys were systematically reviewed in the current work. Meanwhile, this paper also provided an analysis about the strengthening mechanism of rare earth elements on the oxidation behavior for Mo-Si-based alloys after discussing the oxidation process. It is shown that adding rare earth elements, on the one hand, can optimize the microstructure of the alloy, thus promoting the rapid formation of protective SiO2 scale. On the other hand, it can act as a diffusion barrier by producing stable rare earth oxides or additional protective films, which significantly enhances the oxidation resistance of the alloy. Furthermore, the research focus about the oxidation protection of Mo-Si-based alloys in the future was prospected to expand the application field.

show abstract

“…Moreover, Y can also inhibit ion diffusion in grain boundaries and decrease the oxide-scale growth rate [117][118][119]. The presence of Y improves the adhesion between oxide film and substrate, thus improving the alloyed oxidation resistance [120,121].…”

Section: Effects Of Y Element Additionmentioning

confidence: 99%

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Yu¹,

Fu²,

Wang³

et al. 2021

Preprint

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Traditional refractory materials such as nickel-based superalloys have been gradually unable to meet the performance requirements of advanced materials. The Mo-Si-based alloy, as a new type of high temperature structural material, has entered the vision of researchers due to its charming high temperature performance characteristics. However, its easy oxidation and even "pesting oxidation" at medium temperatures limit its further applications. In order to solve this problem, researchers have conducted large numbers of experiments and made breakthrough achievements. Based on these research results, the effects of rare earth elements like La, Hf, Ce and Y on the microstructure and oxidation behavior of Mo-Si-based alloys were systematically reviewed in the current work. Meanwhile, this paper also provided an analysis about the strengthening mechanism of rare earth elements on the oxidation behavior for Mo-Si-based alloys after discussing the oxidation process. Furthermore, the research focus about the oxidation protection of Mo-Si-based alloys in the future was prospected to expand the application field.

show abstract

Isothermal Oxidation Behavior of Ti-50Al Alloy with Y Additions at 800 and 900°C

Cited by 23 publications

References 47 publications

Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys

Oxidation behaviour of TiAl-based intermetallic coatings on γ-TiAl alloys

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

Rare Earth Elements Enhanced the Oxidation Resistance of Mo-Si-Based Alloys for High Temperature Application: A Review

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