High-temperature environmental embrittlement of thermomechanically processed TiAl-based intermetallic alloys

Hotta, Yuji; Kaneno, Yasuyuki; Takasugi, Takayuki; Tetsui, Toshimitsu

doi:10.1007/s11661-006-0006-1

Cited by 5 publications

(1 citation statement)

References 25 publications

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“…Research shows that the hydrogen–induced environmental embrittlement of a TiAl alloy can be affected by many factors. Hotta et al tested five TiAl alloys with different compositions and found that all alloys showed reduced fracture strength and fracture strain in air, water vapor and H 2 + Ar compared to vacuum, but exhibited different sensitivities [ 18 ]. The different compositions reflect the difference in phase content in the alloy.…”

Section: Introductionmentioning

confidence: 99%

Microstructure Sensitivity on Environmental Embrittlement of a High Nb Containing TiAl Alloy under Different Atmospheres

Zhang

et al. 2022

Materials

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Mechanical properties in different atmospheres, including oxygen, vacuum, air and H2, of high Nb containing TiAl alloys with the compositions of Ti–45Al–8.5Nb–(0.2W, 0.2B, 0.02Y) have been investigated in this work. Three different microstructure types, nearly lamellar, gamma phase increased nearly lamellar and fully lamellar are selected for revealing the microstructure sensitivity of environmental embrittlement. The results show that the three types of microstructures are all affected by the hydrogen–induced environmental embrittlement. Although the fracture mode of the experimental alloy is cleavage fracture in all atmospheres, the proportions of transgranular and intergranular fractures are different, especially comparing the fracture surfaces in oxygen and hydrogen. Performance comparison results show that the nearly lamellar microstructure is the most susceptible to the hydrogen–induced environmental embrittlement, while the gamma phase increased microstructure is the most stable one; the fully lamellar microstructure results in moderate susceptibility to the atmospheres. Combined with the hydrogen absorption kinetic analysis, it indicates that γ phase at the interface of lamellar colony significantly inhibits the hydrogen–induced environmental embrittlement, while the effect of β phase is just the opposite. In addition, the correlation between microstructure and hydrogen–induced environmental embrittlement is revealed and the corresponding mechanism is also discussed in this work.

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Section: Introductionmentioning

confidence: 99%

Microstructure Sensitivity on Environmental Embrittlement of a High Nb Containing TiAl Alloy under Different Atmospheres

Zhang

et al. 2022

Materials

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Hydride formation during cathodic charging and its effect on mechanical properties of a high Nb containing TiAl alloy

Zhang

Song

2018

International Journal of Hydrogen Energy

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Microstructure and mechanical properties of a new Ni–Co based superalloy at intermediate temperatures

Xiao,

He,

et al. 2024

Journal of Materials Research and Technology

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High-temperature environmental embrittlement of thermomechanically processed TiAl-based intermetallic alloys

Cited by 5 publications

References 25 publications

Microstructure Sensitivity on Environmental Embrittlement of a High Nb Containing TiAl Alloy under Different Atmospheres

Microstructure Sensitivity on Environmental Embrittlement of a High Nb Containing TiAl Alloy under Different Atmospheres

Hydride formation during cathodic charging and its effect on mechanical properties of a high Nb containing TiAl alloy

Microstructure and mechanical properties of a new Ni–Co based superalloy at intermediate temperatures

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