Moisture induced environmental embrittlement of a high Nb containing TiAl alloy

Wu, Zhongzhen; Hu, Rui; Zhang, Tiebang; Zhou, Huan; Li, Jinshan

doi:10.1016/j.msea.2017.06.064

Cited by 12 publications

(5 citation statements)

References 35 publications

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“…The three alloy microstructures are divided into two microstructure types: near lamellar and full lamellar microstructure. The microstructure type, colony size and phase content of the three alloys have been explained in the authors’ previous work [ 17 ]. It is known from the previous work that the similar colony sizes of the three microstructures can ensure that they are in a comparable range.…”

Section: Resultsmentioning

confidence: 99%

“…In the vacuum, a small amount of air will be present in the laboratory due to the limitations of the vacuum degree. Additionally, the presence of water vapor in the air can affect the experimental alloys, resulting in environmental embrittlement [ 17 ]. Consequently, its fracture strength and fracture strain are decreasing at 539.6 MPa and 3.67%, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Compared with the air, the performance degradation ratio of the alloy in the hydrogen atmosphere is as follows: the fracture strength is 11.6%, and the fracture strain is 18.1%. From the authors’ previous work [ 17 ], comparing with the reduction ratio of the as–cast alloy in the water vapor and air, it indicates that hydrogen has a greater effect on the experimental alloy. The degradation of the alloy’s properties tends to accelerate with the changing atmospheres.…”

Section: Resultsmentioning

confidence: 99%

“…In addition to intrinsic brittleness, the main reason for low plasticity is environmental embrittlement. Hydrogen embrittlement is the most important form of reducing the mechanical properties of alloys, and has been one of the research hot spots in the field of TiAl alloys for many years [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

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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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Zhang

et al. 2022

Materials

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“…Recently, many kinds of Nb in the order of 5~10% have been used to develop new kinds of TiAl alloys, such as Ti-45Al-(5-10)Nb alloys. In these alloys, Nb plays an important role in enhancing high-temperature strength and antioxidation ability [4][5][6][7]. However, the application of monolithic high-Nb-containing γ-TiAl alloy is limited due to its relatively poor fracture toughness.…”

Section: Introductionmentioning

confidence: 99%

A Study on the Zener-Holloman Parameter and Fracture Toughness of an Nb-Particles-Toughened TiAl-Nb Alloy

Liu

Wang

et al. 2018

Metals

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Hot compressive deformation behaviors of a powder metallurgy Ti-45Al-5Nb-0.4W/2Nb (at. %) were investigated at strain rates from 0.001 s −1 to 1 s −1 and temperatures from 1050 • C to 1200 • C. The Zener-Hollomon (Z) parameter can affect the hot deformation mechanism significantly. At a high Z condition, Nb particles played an important role in coordinating the deformation. At a low Z condition, deformation of Nb particles accompanied by dynamic recrystallization (DRX) can act as a dominant softening mechanism. The as-forged pancake exhibits a short rod-like particle-toughened equiaxed matrix. For notched three-point bending (3PB) tests, the fracture toughness of an Nb-particles-toughened high-Nb-containing duplex phase γ-TiAl alloy was hardly affected by the loading rate, presenting a peak fracture toughness of about 12.9 MPa•m 1/2. The toughness of the present alloy can be improved by ductile Nb particles. A model based on the Griffith-Orowan-Irwin relation was constructed, which is quite accurate to predict the facture toughness of the present specimen using tensile properties.

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High-Temperature Corrosion of Ti-46Al-6Nb-0.5 W-0.5Cr-0.3Si-0.1C Alloy in Ar/0.2%SO2 Gas

et al. 2020

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Moisture induced environmental embrittlement of a high Nb containing TiAl alloy

Cited by 12 publications

References 35 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

A Study on the Zener-Holloman Parameter and Fracture Toughness of an Nb-Particles-Toughened TiAl-Nb Alloy

High-Temperature Corrosion of Ti-46Al-6Nb-0.5 W-0.5Cr-0.3Si-0.1C Alloy in Ar/0.2%SO2 Gas

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