Modern Refractory Alloys Based on Titanium Gamma-Aluminide: Prospects of Development and Application

Nochovnaya, N. А.; Pаnin, P.V.; Kochetkov, A. S.; Боков, К А

doi:10.1007/s11041-014-9763-4

Cited by 33 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such room temperature ductility limits the fabrication of these alloys [6]. The addition of the alloying elements such as Nb, Cr, and Si, to TiAl-based alloys, is known to improve their low-temperature ductility, solute solution strengthening, and oxidation resistance [10][11][12][13]. Furthermore, fabrication of the TiAl-based alloys can be achieved through the process of powder metallurgy, ingot metallurgy, investment casting, additive manufacturing, selective laser melting, and vacuum arc re-melting (VAR) [14 -17].…”

Section: Introductionmentioning

confidence: 99%

The electrochemical corrosion behaviour of Ti-48Al-2Nb-0.7Cr-0.3Si alloy in 3.5%NaCl

et al. 2022

View full text Add to dashboard Cite

Titanium aluminides (TiAl) have attracted industrial interest, particularly for high temperature applications owing to their promising mechanical properties. Due to the application of these materials to the marine environment it is therefore important to understand their performance under such conditions. In this study, the corrosion behaviour of Ti-48Al-2Nb-0.7Cr-0.3Si alloy produced by vacuum arc melting was investigated using the potentiodynamic polarization method. The corroded surface and Ti-Al phases were investigated by scanning electron microscopy (SEM), optical microscopy, and X-ray diffraction (XRD). Hardness was examined by a Vickers micro hardness tester with a diamond indenter. Pitting was observed to occur within the surface defects and caused severe corrosion.

show abstract

Section: Introductionmentioning

confidence: 99%

The electrochemical corrosion behaviour of Ti-48Al-2Nb-0.7Cr-0.3Si alloy in 3.5%NaCl

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The brittleness and low fracture toughness of γ-Ti-Al makes it difficult to manufacture parts using conventional methods. The lack of ductility in these alloys has necessitated alternative manufacturing routes such as additive manufacturing (AM) of γ-Ti-Al parts for aerospace applications [10][11][12][13][14]. Electron beam melting and laser beam melting are the most used AM process for both research and parts production [15,16].…”

Section: Introductionmentioning

confidence: 99%

Heat Treatment of In Situ Laser-Fabricated Titanium Aluminide

Hoosain

Pityana

Freemantle³

et al. 2018

Metals

View full text Add to dashboard Cite

Direct energy deposition (DED) via laser processing, operated under standard conditions with a localised shielding gas, is a potential method for the manufacture of the γ-TiAl alloy. The freedom of operation, which includes the production of components via in situ melting of elemental powders, makes this method economically attractive. The goal of this study was to optimise the mass flow rates that lead to gamma phase formation during laser in situ melting of Ti and Al. A 3 kW Nd:YAG laser was used to melt Ti and Al elemental powders. Single clads were produced on Ti6Al4V substrates under localised argon shielding. The samples were heat-treated to promote microstructural homogenization and to provide thermal stress relief, after which they were characterized. Lamellar and duplex microstructures were obtained; depending on the Al feed rate and heat treatment temperatures. The Vickers microhardness was found to be predominantly dependent on Al content and the amount of twinning present. X-ray diffraction detected a proportional increase in the intensity of the γ phase peak with an increase in Al content, while α2 peaks were dissolved and the twin γ-Ti3Al5 peaks diminished slightly. An alloy produced in this work achieved the target microstructure and properties associated with superior ductility and tensile strength in these materials, indicating that the technology has future potential in the production of Ti-Al materials for applications such as structural components or thermal barrier coatings.

show abstract

“…They are well suited for the last stages of compressor blades but their effectiveness is controversial. On one hand, due to the combination of specific strength and heat resistance, they can replace traditional nickel-based alloys [33,59]. On the other hand, the technology of their manufacturing and processing is quite energy-intensive, which makes them costineffective in the case of small turbofan engines.…”

Section: Aluminium-based Alloysmentioning

confidence: 99%

Advanced Materials and Technologies for Compressor Blades of Small Turbofan Engines

2020

View full text Add to dashboard Cite

Manufacturing costs, along with operational performance, are among the major factors determining the selection of the propulsion system for unmanned aerial vehicles (UAVs), especially for aerial targets and cruise missiles. In this paper, the design requirements and operating parameters of small turbofan engines for single-use and reusable UAVs are analysed to introduce alternative materials and technologies for manufacturing their compressor blades, such as sintered titanium, a new generation of aluminium alloys and titanium aluminides. To assess the influence of severe plastic deformation (SPD) on the hardening efficiency of the proposed materials, the alloys with the coarse-grained and submicrocrystalline structure were studied. Changes in the physical and mechanical properties of materials were taken into account. The thermodynamic analysis of the compressor was performed in a finite element analysis system (ANSYS) to determine the impact of gas pressure and temperature on the aerodynamic surfaces of compressor blades of all stages. Based on thermal and structural analysis, the stress and temperature maps on compressor blades and vanes were obtained, taking into account the physical and mechanical properties of advanced materials and technologies of their processing. The safety factors of the components were established based on the assessment of their stress-strength characteristics. Thanks to nomograms, the possibility of using the new materials in five compressor stages was confirmed in view of the permissible operating temperature and safety factor. The proposed alternative materials for compressor blades and vanes meet the design requirements of the turbofan at lower manufacturing costs.

show abstract

Modern Refractory Alloys Based on Titanium Gamma-Aluminide: Prospects of Development and Application

Cited by 33 publications

References 3 publications

The electrochemical corrosion behaviour of Ti-48Al-2Nb-0.7Cr-0.3Si alloy in 3.5%NaCl

The electrochemical corrosion behaviour of Ti-48Al-2Nb-0.7Cr-0.3Si alloy in 3.5%NaCl

Heat Treatment of In Situ Laser-Fabricated Titanium Aluminide

Advanced Materials and Technologies for Compressor Blades of Small Turbofan Engines

Contact Info

Product

Resources

About