Comparison of the isothermal and cyclic oxidation behavior of Cr and Mo containing γ-TiAlNb alloys

Neelam, Naga Sruthi; Banumathy, S.; Bhattacharjee, Anup Kumar; Gvs, Nageswara Rao; Alam, Zafir

doi:10.1016/j.corsci.2019.108300

Cited by 17 publications

(4 citation statements)

References 49 publications

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“…The fracture toughness of the annealed coatings after annealing at 1100 • C for 3 h was about 12-16 times than that of the as-sprayed coatings. (12) The weight loss of the annealed coatings (as-sprayed at 250 • C, 450 • C, and 550 • C) after annealing at 1100 • C for 3 h was 5.2 ± 0.65, 2.1 ± 0.15, and 3.5 ± 0.24 mg, respectively. The wear resistance property of the annealed coating (as-sprayed at 450 • C) after annealing at 1100 • C for 3 h enhanced about seven times more than that of the coating sprayed at 450 • C (15.47 ± 0.25 mg).…”

Section: Discussionmentioning

confidence: 93%

“…As the ball milling time was further prolonged, the flocculent structure Ti(Al) solid solution (as indicated by yellow arrow in Figure 6e,f) appeared obviously in mixture powders, and the particle size of mixture powders was also further decreased. The size distribution (D50) of mixture powders after ball milling for different milling time (6,12,18,24,30, and 36 h) was 68.4 µm, 78.9 µm, 46.4 µm, 35.8 µm, 15.4 µm, and 10.8 µm, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The particle size distribution of Ti, Al, and C powders (as shown in Figure 2) was measured by a laser diffraction meter (GSL-1020, Liaoning Instrument Research Institute Co., Ltd., Liaoning, China). The pure Ti, Al, and C powders were ball-milled for different milling time (6,12,18,24,30, and 36 h) by a mechanical alloying method to form Ti(Al, C) mixture powders. A planetary ball mill (QM-3SP2, Nanjing Nanda Instrument Plant, Jiangsu, China) was used for ball milling, and the selection of ball milling parameters is a ball-to-powder weight ratio of 10:1 at a rotational speed of 180 rpm.…”

Section: Powder and Coating Preparationmentioning

confidence: 99%

“…The brittleness at room temperature of TiAl intermetallic compounds was improved by additions of alloying elements such as Mo, Cr, Nb, V, and Mn [11][12][13][14][15][16]. Meanwhile, the addition of second ceramic phase particles (e.g., TiB 2 [17], Al 2 O 3 [18][19][20], SiC [21], TiC [22,23], Ti 2 AlC [24], Ti 5 Si 3 [25], and their combination [26][27][28]) to titanium aluminide alloys can further improve the creep resistance, fracture toughness, wear resistance, and heat-resistance stability of TiAl intermetallic compounds.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure, Microhardness, Fracture Toughness, and Abrasive Wear of In-Situ Synthesized TiC/Ti-Al Composite Coatings by Cold Spraying Combined with Heat Treatment

Chen

Bai

et al. 2021

Coatings

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TiAl intermetallic compounds, as a new kind of high-performance light-weight structural material, are widely applied in many fields. Titanium carbide (TiC) as the reinforcing phase could improve the mechanical properties, wear resistance, and heat-resistance stability of TiAl intermetallic compounds. Ti(Al, C) mixture powders were deposited by cold spraying at gas temperature of 250 °C, 450 °C, and 550 °C. Then, Ti(Al, C) coatings were annealed at temperatures of 650 °C for different times and following holding at 1100 °C for 3 h. The microstructure, microhardness, fracture toughness, and abrasive wear of Ti-Al composite coatings were investigated. The research results were that the particle size of mixture powders decreased as the ball milling time prolonging. Ti(Al) solid solution appeared in the mixture powders as the milling time increased to 30 h. The average porosity of the coating sprayed at 550 °C was the lowest (0.85%). The as-sprayed coatings exhibited the same phase compositions with the mixture powders. The coating sprayed at gas temperature of 550 °C has the highest microhardness and the lowest weight loss. Ti-Al intermetallic was in-situ synthesized after annealing at 650 °C. The average porosity of the annealed coating (sprayed at 450 °C) was the lowest. The content of Ti-Al intermetallic compounds of the annealed coating sprayed at 450 °C is the highest. The X-ray diffraction( XRD) analysis results are consistent with the EDS analysis of the annealed coatings after annealing at 650 °C. Ti-Al intermetallic compounds were almost completely formed in the three kinds of the coatings after annealing at 650 °C for 20 h and following holding at 1100 °C for 3 h. TiAl and TiAl3 intermetallic phases were in-situ synthesized in the coatings based on the energy dispersive spectroscopy (EDS) and XRD analysis. TiC was also in situ synthesized in the coatings as the annealing temperature increased to 1100 °C. The annealed coating (sprayed at 450 °C) has the highest microhardness, fracture toughness, and wear resistance properties after annealing at 1100 °C for 3 h.

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Section: Discussionmentioning

confidence: 93%