How Si affects the microstructural evolution and phase transformations of intermetallic γ-TiAl based alloys

Musi, Michael; Galy, Benjamin; Stark, Andreas; Schell, Norbert; Hantcherli, Muriel; Monchoux, Jean‐Philippe; Couret, Alain; Clemens, Helmut; Spoerk-Erdely, Petra

doi:10.1016/j.mtla.2022.101475

Cited by 6 publications

(19 citation statements)

References 49 publications

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“…Red data points were determined by a combination of in situ high-energy X-ray diffraction (HEXRD), differential scanning calorimetry (DSC) and heat treatments (HT), while green ones were obtained by DSC and heat treatments. Based on the data given in the work by Musi et al [255] temperature, alloying with more than 0.1 at% C stabilizes the α phase sufficiently to reintroduce this phase field region, e.g., see circle labeled "2" in Figure 14. With respect to the other important solid-solid phase transformations in γ-TiAl based alloys, C and N increase the eutectoid temperature, while leaving the γ-solvus temperature mostly unaffected.…”

Section: Interstitial Elements C O and Nmentioning

confidence: 99%

“…Red data points were determined by a combination of in situ high‐energy X‐ray diffraction (HEXRD), differential scanning calorimetry (DSC) and heat treatments (HT), while green ones were obtained by DSC and heat treatments. Based on the data given in the work by Musi et al [ 255 ]…”

Section: Effect Of Additional Alloying Elements On the Phase Transfor...mentioning

confidence: 99%

“…Not only was Si found to increase the amount of γ phase at the expense of the α 2 phase at low temperatures while leaving the amount β o phase constant, it also increased the temperatures of solid‐solid phase transformations, e.g., see Figure 13b. [ 255 ]…”

Section: Effect Of Additional Alloying Elements On the Phase Transfor...mentioning

confidence: 99%

“…Red atoms correspond to Ti, blue ones to Al; c) Microstructure of a heat-treated TNM alloy showing a complex multi-phase microstructure consisting of α 2 , β o and γ phase. Adapted with permission [255]. Copyright 2022, Elsevier.…”

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confidence: 99%

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Alloying Elements in Intermetallic γ‐TiAl Based Alloys – A Review on Their Influence on Phase Equilibria and Phase Transformations

et al. 2023

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Intermetallic γ–TiAl based alloys are innovative structural materials dedicated to applications in the automotive and aeronautic industry. Especially their low density, high specific yield strength and excellent resistance against creep and oxidation make them a suitable choice for structural high‐temperature components in combustion engines. However, further improvement of their properties and processability is required to conquer new application areas and facilitate cost‐effective production. While the incorporation of additional alloying elements is a promising possibility, their effects on the phase transformations and phase equilibria need to be considered rigorously. In this context, this review provides a detailed survey of the research work on the influence of technically important alloying elements on the Ti–Al phase diagram. First, an introduction to the fundamentals of the phase transformations in γ‐TiAl based alloys and the consequences of changed cooling conditions, relevant for example to the latest developments within the field of processing, is given. Afterwards, the alloying elements, categorized with respect to their stabilization effect, are discussed and their particularities highlighted. Topics covered include established ternary phase diagrams and isoplethal sections, the stabilization of additional phases as well as the influence of alloying elements on the microstructure of modern engineering intermetallic γ‐TiAl based alloys.This article is protected by copyright. All rights reserved.

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Section: Interstitial Elements C O and Nmentioning

confidence: 99%

Section: Effect Of Additional Alloying Elements On the Phase Transfor...mentioning

confidence: 99%

Section: Effect Of Additional Alloying Elements On the Phase Transfor...mentioning

confidence: 99%

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confidence: 99%

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Alloying Elements in Intermetallic γ‐TiAl Based Alloys – A Review on Their Influence on Phase Equilibria and Phase Transformations

et al. 2023

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“…For increase the operating temperature and oxidation resistance of the TiAl alloy, it is possible to introduce alloying elements into the base material by diffusion treatment (Jiang et al, 2008). The main elements modifying the surface layer of the Ti-Al intermetallics are: Si (Musi et al, 2022), Nb (Jiang et al, 2002), W (Wendler & Kaczmarek, 2005) or Mo (Chlupová et al, 2020). Above a temperature of 800˚C, the material begins to oxidize quickly, which leads to a reduction in mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

The formation of Al-Si aluminide coatings by pack cementation method on TNM-B1 intermetallic alloy

Woźniak

Góral

Kościelniak

2023

AMME

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The TiAl intermetallics are the promising material for aerospace application. According to its insufficient oxidation resistance above 900oC the using of protective coatings is necessary. The diffusion aluminide coatings based on TiAl2 or TiAl3 phases permits to formation of alumina scale on the surface of TiAl alloys. The pack cementation with Si doping is one of the most popular method of this type of coatings production. In present article the influence of Si content in the pack, process time and temperature during pack cementation process were investigated. The thickness of obtained coating was in range 20-50 μm. When Si content was higher the formation of titanium silicides was observed using almost all analysed values of process parameters. The results showed that using of 24 wt. % Si containing pack and process parameters: 4h/950oC enables to obtain the coating characterized by optimal thickness and structure. The porosity and cracks in coatings according to TiAl phases brittleness was observed.

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Microstructural, microhardness and electrochemical properties of heat-treated LENS in-situ synthesized Ti–Al-x(Mo, Si) alloys

Raji,

Popoola

2024

Heliyon

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How Si affects the microstructural evolution and phase transformations of intermetallic γ-TiAl based alloys

Cited by 6 publications

References 49 publications

Alloying Elements in Intermetallic γ‐TiAl Based Alloys – A Review on Their Influence on Phase Equilibria and Phase Transformations

Alloying Elements in Intermetallic γ‐TiAl Based Alloys – A Review on Their Influence on Phase Equilibria and Phase Transformations

The formation of Al-Si aluminide coatings by pack cementation method on TNM-B1 intermetallic alloy

Microstructural, microhardness and electrochemical properties of heat-treated LENS in-situ synthesized Ti–Al-x(Mo, Si) alloys

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