Effects of nano-NiO addition on the microstructure and corrosion properties of high Nb-TiAl alloy

Gui, Wanyuan; Liu, Mengdi; Qu, Yuhai; Wang, Yuchao

doi:10.1016/j.jallcom.2018.12.200

Cited by 12 publications

(4 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Combined with the images in Figure 3, the oxide scale on the bare TiAl specimen was separated from the surface during oxidation, which was identified to be the mixture of TiO 2 and Al 2 O 3 . Similar observations were reported in the study of Zhao et al [26], in which TiO 2 and Al 2 O 3 exhibited competitive growth due to their similar formation energies, leading to the failure protection for the substrate alloy [6,8,26,27]. However, the oxidized TiAl specimen with fluorine treatment presented an increased diffraction peak intensity of α 2 and increased oxides, such as the crystal plane of (201) at 40.8 • for α 2 , and crystal plane of (113) at 43.26 • for α-Al 2 O 3 .…”

Section: Structure and Chemical Compositionsupporting

confidence: 87%

“…γ-TiAl alloys exhibit broad application prospects in gas turbines and the automotive industry, owing to their low density, high specific strength, high specific stiffness and good high-temperature creep properties [1][2][3][4][5][6][7][8][9]. However, the components of γ-TiAl alloys fail to generate a protective Al 2 O 3 film at high temperatures (~750 • C) due to the similar formation entropy of TiO 2 and Al 2 O 3 [10][11][12][13], resulting in a loose oxide scale with the mixed TiO 2 and Al 2 O 3 .…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fluorine Effect for Improving Oxidation Resistance of Ti-45Al-8.5Nb Alloy at 1000 °C

et al. 2022

Self Cite

View full text Add to dashboard Cite

In-depth analyses of the anti-oxidation behavior and structure of γ-TiAl alloys are of great significant for their maintenance and repair in engineering applications. In this work, fluorine-treated Ti-45Al-8.5Nb alloys and fluorine-treated oxidized specimens with artificial defects were prepared by isothermal oxidation treatment at 1000 °C. Several characterization methods, including SEM, EDS, XRD and TEM, were used to evaluate the surface microstructure of the fluorine-treated Ti-45Al-8.5Nb alloys and fluorine-treated oxidized specimens with artificial defects. The results indicate that the fluorine promoted the formation of an outer protective film of Al2O3, which significantly improved the oxidation resistance. The microcracks of oxidized specimens with the artificial defects provided a rapid diffusion passage for Ti and O elements during the 1000 °C/2 h isothermal oxidation treatment process, resulting in the quick growth of TiO2 toward the outside. The fine Al2O3 constituted a continuous film after the 1000 °C/100 h isothermal oxidation treatment. In particular, Al2O3 particles grew toward the substrate, which was ascribed to the good oxidation resistance and adhesion. These results may provide an approach for the repair of protective oxide film on the surface of blades and turbine disks based on γ-TiAl alloys.

show abstract

Section: Structure and Chemical Compositionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Fluorine Effect for Improving Oxidation Resistance of Ti-45Al-8.5Nb Alloy at 1000 °C

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…More specifically, the oxide scale of TiAl alloys generally consists of three layers, an outer layer of TiO 2 , an intermediate layer of Al 2 O 3 and a porous inner layer consisting of TiO 2 and Al 2 O 3 grains. A great deal of research has already been conducted to enhance the anti-oxidation resistance of TiAl-based alloys above 800 • C through the addition of ternary and quaternary alloy elements into TiAl-based alloys, such as Nb [28], Ta [29], Ni [30], Y [31], B [16], Si [32], W [33] and Mo [34], either to form a protective scale or to slow down the oxygen diffusion rate. However, these studies are still at the experimental stages based on bulk TiAl-based alloys.…”

Section: Introductionmentioning

confidence: 99%

Ti-40Al-10Nb-10Cr Porous Microfiltration Membrane with Hierarchical Pore Structure for Particulate Matter Capturing from High-Temperature Flue Gas

et al. 2022

Self Cite

View full text Add to dashboard Cite

TiAl-based porous microfiltration membranes are expected to be the next-generation filtration materials for potential applications in high-temperature flue gas separation in corrosive environments. Unfortunately, the insufficient high-temperature oxidation resistance severely limits their industrial applications. To tackle this issue, a Ti-40Al-10Nb-10Cr porous alloy was fabricated for highly effective high-temperature flue gas purification. Benefited from microstructural changes and the formation of two new phases, the Ti-40Al-10Nb-10Cr porous alloy demonstrated favorable high-temperature anti-oxidation performance with the incorporation of Nb and Cr high-temperature alloying elements. By the separation of a simulated high-temperature flue gas, we achieved an ultra-high PM-removal efficiency (62.242% for PM<2.5 and 98.563% for PM>2.5). These features, combined with our experimental design strategy, provide a new insight into designing high-temperature TiAl-based porous materials with enhanced performance and durability.

show abstract

“…[ 5–9 ] To further regulate and control the microstructure and improve the elevated tensile properties of TiAl alloys, the idea of composite materials has been considered by some researchers, and many interesting experimental results have been obtained in this respect. [ 10–13 ] The melting–casting method is one of the preparation technologies used to acquire TiAl‐based composites; this method of in situ phase enhancement has gained attention from many scholars because of its many advantages, such as simplicity of operation, uniform distribution of the enhancement phase, strong bonding between the reinforcing phase and the matrix, and so on. [ 14–18 ] One of the in situ reinforced phases is the Ti 2 AlC phase, which forms during the casting process and serves as a heterogeneous nucleation particle.…”

Section: Introductionmentioning

confidence: 99%

Effects of Heating Power on Microstructure Evolution and Tensile Properties at Elevated Temperature by Directional Solidification for Ti2AlC/TiAl Composites

et al. 2021

View full text Add to dashboard Cite

To improve the directionally solidified microstructure and tensile properties at elevated temperature, Ti46Al4Nb1C0.8Ta ingots are directional solidified by electromagnetic cold crucible with different heating powers. The microstructure is observed and characterized, tensile properties are tested, and related mechanisms are revealed. Results show that a relatively planar liquid–solid interface is formed under the low heating power (39 kW), which promoted formation of columnar crystals. When the heating power increases from 39 to 48 kW, degree of dent (H1) increases from 8.5 to 18.1 mm and influence length of the initial transition area (H2) increases from 4.3 to 28.6 mm. The formation of a concave liquid–solid interface is due to the high heating power increasing the temperature gradient. High heating power increases the electromagnetic stirring ability, which increases the time to reach stable growth. Tensile properties of the directionally solidified alloy are higher than those of the as‐cast alloy under the same testing temperature, e.g., the tensile strength is 342.5 MPa, an increase of 1.4 times, and the tensile strain is 4.4%, an increase of 1.3 times at 950 °C. This shows that the tensile properties and microstructure of TiAl‐based composites can be improved by the directional solidification technology.

show abstract

Effects of nano-NiO addition on the microstructure and corrosion properties of high Nb-TiAl alloy

Cited by 12 publications

References 37 publications

Fluorine Effect for Improving Oxidation Resistance of Ti-45Al-8.5Nb Alloy at 1000 °C

Fluorine Effect for Improving Oxidation Resistance of Ti-45Al-8.5Nb Alloy at 1000 °C

Ti-40Al-10Nb-10Cr Porous Microfiltration Membrane with Hierarchical Pore Structure for Particulate Matter Capturing from High-Temperature Flue Gas

Effects of Heating Power on Microstructure Evolution and Tensile Properties at Elevated Temperature by Directional Solidification for Ti2AlC/TiAl Composites

Contact Info

Product

Resources

About