Processing 4th generation titanium aluminides via electron beam based additive manufacturing – characterization of microstructure and mechanical properties

Reith, Marcel; Franke, Martin; Schloffer, Martin; Körner, Carolin

doi:10.1016/j.mtla.2020.100902

Cited by 56 publications

(35 citation statements)

References 28 publications

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“…B acts as β stabilizer. As indicated by arrow 3 in Figure 4, the addition of B lead to a slight increase in the eutectoid and α-transus temperatures and to a slight decrease in the α → α + β transition temperature [37]. C is an α stabilizer.…”

Section: B C and Simentioning

confidence: 96%

“…Of these, interest has primarily focused on the gamma titanium aluminides (γ TiAl alloys), which are mainly composed of the γ-TiAl phase and are considered as advanced aero-engine materials. Compared with conventional materials in this field, such as nickel-based alloys, intermetallic γ TiAl alloys possess numerous attractive properties, such as low density (3.9-4.2 g/cm 3 ), high specific strength and good creep properties up to high temperatures. They also exhibit better oxidation resistance than conventional Ti alloys.…”

Section: Introductionmentioning

confidence: 99%

“…Several compositions have attracted interest and are under development, including the TNM + (Ti-43.5Al-4Nb-1Mo-0.3C-0.3Si-0.1B at. %) alloys and BMBF alloys (γ TiAl alloys for additive manufacturing by electron beam melting, funded by the German Federal Ministry of Education and Research) [3][4][5]. Different generations of γ TiAl alloys have been applied in automotive and aircraft engines for many years during the development process.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Microstructure Design and Its Effect on Mechanical Properties in Gamma Titanium Aluminides

Liu

Lin

Zhang

et al. 2021

Metals

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Intermetallic gamma titanium aluminides display attractive engineering properties at high temperatures of up to 750 °C. To date, they have been used in low-pressure turbine blades and turbocharger rotors in advanced aircraft and automotive engines. This review summarizes the fundamental information of the Ti–Al system. After providing the development of TiAl alloys, typical phases, microstructures and their characteristics in TiAl alloys, the paper focuses on the effects of alloying elements on the phase boundary shifting, stabilizing effects and strengthening mechanism. The relationships between chemical additions, microstructure evolution and mechanical properties of the alloy are discussed. In parallel, the processing technologies and the common heat treatment methods are described in detail, both of which are applied to optimize the mechanical properties via adjusting microstructures. On this basis, the effects from chemical composition, processing technologies and heat treatments on microstructure, which controls the mechanical properties, can be obtained. It has a certain guiding significance for tailoring the microstructures to gain desired mechanical properties.

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Section: B C and Simentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure Design and Its Effect on Mechanical Properties in Gamma Titanium Aluminides

Liu

Lin

Zhang

et al. 2021

Metals

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“…Titanium aluminide (TiAl) is a member of group material referred to as intermetallics, consisting of various metals resulting in ordered crystallographic structures formed when the concentration of the alloy exceeds the solubility limit [1]. Properties as low density, high strength and elevated temperature properties make TiAl replacement candidates for nickel-based superalloys used in the aerospace and automotive industries [2][3][4]. One such alloy tried and tested by General Electric [5] for commercial turbofan engines is Ti-48Al-2Cr-2Nb.…”

Section: Introductionmentioning

confidence: 99%

Hot Corrosion and Oxidation Behaviour of TiAl Alloys during Fabrication by Laser Powder Bed Additive Manufacturing Process

Mogale¹,

Matizamhuka²,

Cobbinah³

2022

Corrosion - Fundamentals and Protection Mechanisms

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This research paper summarises the practical relevance of additive manufacturing with particular attention to the latest laser powder bed fusion (L-PBF) technology. L-PBF is a promising processing technique, integrating intelligent and advanced manufacturing systems for aerospace gas turbine components. Some of the added benefits of implementing such technologies compared to traditional processing methods include the freedom to customise high complexity components and rapid prototyping. Titanium aluminide (TiAl) alloys used in harsh environmental settings of turbomachinery, such as low-pressure turbine blades, have gained much interest. TiAl alloys are deemed by researchers as replacement candidates for the heavier Ni-based superalloys due to attractive properties like high strength, creep resistance, excellent resistance to corrosion and wear at elevated temperatures. Several conventional processing technologies such as ingot metallurgy, casting, and solid-state powder sintering can also be utilised to manufacture TiAl alloys employed in high-temperature applications. This chapter focuses on compositional variations, microstructure, and processing of TiAl alloys via L-PBF. Afterward, the hot corrosion aspects of TiAl alloys, including classification, characteristics, mechanisms and preventative measures, are discussed. Oxidation behaviour, kinetics and prevention control measures such as surface and alloy modifications of TiAl alloys at high temperature are assessed. Development trends for improving the hot corrosion and oxidation resistance of TiAl alloys possibly affecting future use of TiAl alloys are identified.

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“…EBAM allows the fine controlling and in situ monitoring of the process parameters, and, therefore, it is widely used for the growing variety of materials and components [23][24][25][26][27][28]. The application of EBAM on aluminum alloys is limited because of the evaporation of alloying elements, such as Mg and Zn, which is the function of heat input.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion Resistance of AA4047/AA7075 Transition Zone Formed Using Electron Beam Wire-Feed Additive Manufacturing

et al. 2021

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A gradient transition zone was obtained using electron beam deposition from AA4047 wire on AA7075 substrate and characterized for microstructures, tensile strength and corrosion resistance. The microstructure of the transition zone was composed of aluminum alloy grains, Al/Si eutectics and Fe-rich and Si-rich particles. Such a microstructure provided strength comparable to that of AA7075-T42 substrate but more intense corrosion due to the higher amount of anodic Mg2Si particles. The as-deposited AA4047 zone formed above the transition zone was composed of aluminum alloy dendrites and interdendritic Al/Si eutectics with low mechanical strength and high corrosion potential.

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Processing 4th generation titanium aluminides via electron beam based additive manufacturing – characterization of microstructure and mechanical properties

Cited by 56 publications

References 28 publications

Microstructure Design and Its Effect on Mechanical Properties in Gamma Titanium Aluminides

Microstructure Design and Its Effect on Mechanical Properties in Gamma Titanium Aluminides

Hot Corrosion and Oxidation Behaviour of TiAl Alloys during Fabrication by Laser Powder Bed Additive Manufacturing Process

Microstructure and Corrosion Resistance of AA4047/AA7075 Transition Zone Formed Using Electron Beam Wire-Feed Additive Manufacturing

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