Surface reactivity of titanium–aluminum alloys: Ti<sub>3</sub>Al, TiAl, and TiAl<sub>3</sub>

Mencer, Donald; Hess, Thomas R.; Mebrahtu, Thomas; Cocke, D. L.; Naugle, D. G.

doi:10.1116/1.577669

Cited by 62 publications

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“…According to data collected in Ref. [22], the minor component at 72.22 eV in the Al 2p envelope, corresponding to Al-Ti bond, is consistent with the presence of the Ti-Al component in the Ti 2p spectra (cf. Fig.…”

Section: Resultssupporting

confidence: 73%

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Novel method to fabricate Ti–Al intermetallic compound coatings on Ti–6Al–4V alloy by combined ultrasonic impact treatment and electrospark deposition

Liu

Wang

Deng

et al. 2015

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 73%

“…3a). The Ti 2p 3/2 binding energy (BE) = 454.10 eV of the minor component in the Ti 2p 3/2 spectrum (about 17.4% of the total peak area) is in accordance with data reported for Ti-Al bonds [22]. In addition, the Ti 2p 3/2 peak at 458.65 eV with a fraction of about 82.6% can be ascribed to Ti 4+ in TiO 2 .…”

Section: Resultssupporting

confidence: 71%

Novel method to fabricate Ti–Al intermetallic compound coatings on Ti–6Al–4V alloy by combined ultrasonic impact treatment and electrospark deposition

Liu

Wang

Deng

et al. 2015

Journal of Alloys and Compounds

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“…[5][6][7] The mechanism of oxidation of Ti-Al is a fundamental and important issue for this kind of practical application. [8][9][10][11] It is reported that there is a large difference between the formation energies of two metals with oxygen in some binary intermetallics, [12,13] and the metal with larger formation energy will be oxidized first and segregate to the surface even at low oxygen pressures and low temperatures. The other one with smaller formation energy will only be oxidized when the temperature is high enough in the oxygen atmosphere.…”

Section: Introductionmentioning

confidence: 98%

First‐principles calculations of oxygen adsorption on the Ti₃Al (0001) surface

Wei

Guo

Dai

et al. 2016

Surface & Interface Analysis

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a Adsorption energies and density of states for O atoms adsorption on the Ti 3 Al (0001) surface have been calculated using first-principles calculations based on density functional theory. It is found that the order of O atom adsorption on the Ti 3 Al (0001) surface is associated with the adsorption energy as well as the distance of O atoms because of the interaction. The adsorption energy mainly depends on the bond number and bond strength between O and Ti atoms, and the adsorption site with rich-Ti surface (H I and HCP Al ) is first priority. The adsorption energy decreases with the increase of the oxygen coverage because of the characteristics of the valence d-orbitals of transition metals surface. Furthermore, the density of states indicates that the hybridization peak of O and Ti atoms is mainly from the contribution of Ti 3d-and O 2p-orbitals, and the hybridization peak of O and Al atoms from the contribution of Al 2p-and O 2p-orbitals.

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“…These E B 's are higher than those of both elemental Al and Ti-Al alloys (72.3 and 71.5-71.4 eV, respectively). 55 The C 1s region for Mo 2 TiAlC 2 was fit by three peaks (Fig. 5(d)), the first peak, at 282.5 eV was assigned to C atoms bonded to the outer Mo and inner Ti layers (labeled C I in Figs.…”

Section: Alcmentioning

confidence: 99%

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

Anasori

Dahlqvist

Halim

et al. 2015

Journal of Applied Physics

263

180

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Herein, we report on the phase stabilities and crystal structures of two newly discovered ordered, quaternary MAX phases-Mo 2 TiAlC 2 and Mo 2 Ti 2 AlC 3 -synthesized by mixing and heating different elemental powder mixtures of mMo:(3-m)Ti:1.1Al:2C with 1.5 m 2.2 and 2Mo: 2Ti:1.1Al:2.7C to 1600 C for 4 h under Ar flow. In general, for m ! 2 an ordered 312 phase, (Mo 2 Ti)AlC 2 , was the majority phase; for m < 2, an ordered 413 phase (Mo 2 Ti 2 )AlC 3 , was the major product. The actual chemistries determined from X-ray photoelectron spectroscopy (XPS) are Mo 2 TiAlC 1.7 and Mo 2 Ti 1.9 Al 0.9 C 2.5 , respectively. High resolution scanning transmission microscopy, XPS and Rietveld analysis of powder X-ray diffraction confirmed the general ordered stacking sequence to be Mo-Ti-Mo-Al-Mo-Ti-Mo for Mo 2 TiAlC 2 and Mo-Ti-Ti-Mo-Al-Mo-Ti-TiMo for Mo 2 Ti 2 AlC 3 , with the carbon atoms occupying the octahedral sites between the transition metal layers. Consistent with the experimental results, the theoretical calculations clearly show that M layer ordering is mostly driven by the high penalty paid in energy by having the Mo atoms surrounded by C in a face-centered configuration, i.e., in the center of the M nþ1 X n blocks. At 331 GPa and 367 GPa, respectively, the Young's moduli of the ordered Mo 2 TiAlC 2 and Mo 2 Ti 2 AlC 3 are predicted to be higher than those calculated for their ternary end members. Like most other MAX phases, because of the high density of states at the Fermi level, the resistivity measurement over 300 to 10 K for both phases showed metallic behavior. V C 2015 AIP Publishing LLC.

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Surface reactivity of titanium–aluminum alloys: Ti₃Al, TiAl, and TiAl₃

Cited by 62 publications

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Novel method to fabricate Ti–Al intermetallic compound coatings on Ti–6Al–4V alloy by combined ultrasonic impact treatment and electrospark deposition

Novel method to fabricate Ti–Al intermetallic compound coatings on Ti–6Al–4V alloy by combined ultrasonic impact treatment and electrospark deposition

First‐principles calculations of oxygen adsorption on the Ti₃Al (0001) surface

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

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Surface reactivity of titanium–aluminum alloys: Ti3Al, TiAl, and TiAl3

Cited by 62 publications

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Novel method to fabricate Ti–Al intermetallic compound coatings on Ti–6Al–4V alloy by combined ultrasonic impact treatment and electrospark deposition

Novel method to fabricate Ti–Al intermetallic compound coatings on Ti–6Al–4V alloy by combined ultrasonic impact treatment and electrospark deposition

First‐principles calculations of oxygen adsorption on the Ti3Al (0001) surface

Experimental and theoretical characterization of ordered MAX phases Mo2TiAlC2 and Mo2Ti2AlC3

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Surface reactivity of titanium–aluminum alloys: Ti₃Al, TiAl, and TiAl₃

First‐principles calculations of oxygen adsorption on the Ti₃Al (0001) surface