Characterization of Si-aluminide coating and oxide scale microstructure formed on γ-TiAl alloy during long-term oxidation at 950 °C

Swadźba, Radosław; Swadźba, L.; Mendala, B.; Witala, B.; Tracz, J.; Marugi, Krzysztof; Pyclik, Ł.

doi:10.1016/j.intermet.2017.04.015

Cited by 47 publications

(24 citation statements)

References 41 publications

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“…Fabrication of Si-Al, Al-Y, and Si-Al-Y layers on TiAl alloys have been shown to produce a series of different intermetallic layers (e.g., aluminide and silicide) and oxide layers, increasing the oxidation resistance of the coated alloys [227][228][229][230][231][232]. In particular, J. Xiang et al [232] Platinum aluminide coatings seem to protect the titanium alloys from oxidation as well as from hot corrosion, preventing the formation of the alpha phase.…”

Section: Aluminide and Chromizing Metallic Coatingsmentioning

confidence: 99%

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

et al. 2021

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Several applications where extreme conditions occur require the use of alloys often containing many critical elements. Due to the ever increasing prices of critical raw materials (CRMs) linked to their high supply risk, and because of their fundamental and large utilization in high tech products and applications, it is extremely important to find viable solutions to save CRMs usage. Apart from increasing processes’ efficiency, substitution, and recycling, one of the alternatives to preserve an alloy and increase its operating lifetime, thus saving the CRMs needed for its manufacturing, is to protect it by a suitable coating or a surface treatment. This review presents the most recent trends in coatings for application in high temperature alloys for aerospace engines. CRMs’ current and future saving scenarios in the alloys and coatings for the aerospace engine are also discussed. The overarching aim of this paper is to raise awareness on the CRMs issue related to the alloys and coating for aerospace, suggesting some mitigation measures without having the ambition nor to give a complete overview of the topic nor a turnkey solution.

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Section: Aluminide and Chromizing Metallic Coatingsmentioning

confidence: 99%

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

et al. 2021

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“…Several authors [ 4 , 9 , 24 , 26 , 61 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 100 , 101 , 102 ] have used a dual-stage heat treatment process in trying to reduce the β-phase. These TiAl-based alloys were first heated to a temperature above the γ solvus temperature (Tγ solv ), held for a brief period to avoid grain growth with subsequent fast cooling.…”

Section: Effects Of Alloying Elements On Tial-based Alloysmentioning

confidence: 99%

“…Thus, titanium aluminide has found application in making seal supports, cases and frames of aircraft engines where clearances are crucial [ 54 ]. Also, it is applied in turbocharger wheels and turbine blades of automobile and aero engines respectively [ 5 , 7 , 21 , 43 , 50 , 58 , 73 , 79 , 80 , 81 , 87 , 88 , 90 , 91 ]. Considerable decrease in fuel consumption and greenhouse gases have been achieved due to the lightweight of rotating components.…”

Section: Introductionmentioning

confidence: 99%

Characteristic effects of alloying elements on β solidifying titanium aluminides: A review

Raji

Popoola

Pityana

2020

Heliyon

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The high strength-to-weight ratio property of titanium aluminide (TiAl) based intermetallic alloys makes researchers regard this type of material as a potential replacement for the heavier superalloys of nickel. These alloys have been applied as turbocharger wheels of automobile and turbine blades of aircraft engines. A much recent alloy type of TiAl called the TNM alloy has emerged and primarily amenable to mechanical working; while providing the best combinations of mechanical properties that could be achieved through manufacturing processes with subsequent heat treatments. This is attained by solidifying entirely through the disordered β-phase (A2 structure). Effects of major alloying elements such as strength improvement, microstructural stability and phase formation demand the understanding of these alloying elements addition in TiAl-based intermetallic alloys. This review paper aims at encapsulating several works regarding the effects of major alloying elements on β-solidifying TiAl-based alloys and summarizing the characteristic effects of Si for these types of alloys. An impetus for future works on these types of intermetallic TiAl-based alloys is also presented.

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“…In order to improve the high temperature performance of γ-TiAl alloys numerous coating solutions have been investigated in the past that include application of such technologies as PVD [14][15][16][17][18][19], vapor phase aluminizing [20][21][22], pack cementation [23], slurry aluminizing [20,24] or halogen effect [25][26][27][28]. Other treatments such as pre-oxidation have been shown to reduce the oxidation rate of TiAl alloys thus prolonging the lifetimes of these materials under high temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

Effect of pre-oxidation on cyclic oxidation resistance of γ-TiAl at 900 °C

et al. 2020

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The paper presents the effect of pre-oxidation on the high temperature oxidation behavior of γ-TiAl alloy. The pre-oxidation treatments were performed at 900 °C for 2 hours under various O and Ar mixtures which resulted in the formation of very thin (200-300 nm) oxide scales and oxygen enriched subsurface layers, containing the α2-Ti3Al(O) and the Ti5Al3O2 Zphase. It is revealed that the pre-oxidation treatment can lower the oxidation rate of the alloy up to 300 hours. Detailed high resolution STEM investigations were performed to characterize the oxide scales and metal-scale interfaces.

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Characterization of Si-aluminide coating and oxide scale microstructure formed on γ-TiAl alloy during long-term oxidation at 950 °C

Cited by 47 publications

References 41 publications

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

Characteristic effects of alloying elements on β solidifying titanium aluminides: A review

Effect of pre-oxidation on cyclic oxidation resistance of γ-TiAl at 900 °C

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Characterization of Si-aluminide coating and oxide scale microstructure formed on γ-TiAl alloy during long-term oxidation at 950 °C

Cited by 47 publications

References 41 publications

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

Critical Raw Materials Saving by Protective Coatings under Extreme Conditions: A Review of Last Trends in Alloys and Coatings for Aerospace Engine Applications

Characteristic effects of alloying elements on β solidifying titanium aluminides: A review

Effect of pre-oxidation on cyclic oxidation resistance of γ-TiAl at 900 °C

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Effect of pre-oxidation on cyclic oxidation resistance of γ-TiAl at 900 °C