Oxidation behavior of TiAl alloy treated by plasma surface chromizing process

He, Z. Y.; Wang, Z.X.; Zhang, F.; Wang, Z.Y.; Liu, X.P.

doi:10.1016/j.surfcoat.2012.05.123

Cited by 12 publications

(4 citation statements)

References 10 publications

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“…In summary, Ta tends to reduce the solubility of oxygen in TiAl alloys, therefore suppressing rutile (TiO 2 ) formation and growth [173,174]. e presence of Cr in TiAl during oxidation also takes the role of a doping element which restricts the permeation of oxygen and promotes preferential oxidation of Al [175]. At elevated temperatures (T > 673 K), Cr forms Cr 2 O 3 .…”

Section: Influence Of Ternary Elements On Oxidation Resistancementioning

confidence: 99%

“…Cr 2 O 3 has a corundum structure like Al 2 O 3 and is also a protective oxide owing to its parabolic growth mechanisms [176]. Cr in TiAl alloys has been suggested to enhance adhesion of oxide mixtures of Al 2 O 3 and TiO 2 due to its solubility in Al 2 O 3 and compatibility with TiO 2 [175]. On the other hand, the potency of Cr in positively influencing oxidation resistance of TiAl alloys is largely dependent on its concentration.…”

Section: Influence Of Ternary Elements On Oxidation Resistancementioning

confidence: 99%

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Solid-State Processing Route, Mechanical Behaviour, and Oxidation Resistance of TiAl Alloys

Cobbinah

Matizamhuka

2019

Advances in Materials Science and Engineering

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A primary challenge associated with TiAl alloys is their low ductility at room temperature. One approach to overcome this flaw is attaining ultrafine grains in the alloy’s final microstructure. The powder metallurgy (PM) processing route favours the synthesising of ultrafine grains in TiAl alloys. This paper features the mechanical alloying (MA) process and rapid consolidation through the spark plasma sintering (SPS) technique, which comprises the PM process. Furthermore, a second approach discussed covers microalloying TiAl alloys. An evaluation of the influence of high oxygen content is also presented, including the formation of α-Al2O3. A section of the review delves into the dynamic recrystallisation mechanisms involved in elevated temperature deformation of TiAl alloys. The final section highlights the efficacy of ternary element additions to TiAl alloys against oxidation.

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Section: Influence Of Ternary Elements On Oxidation Resistancementioning

confidence: 99%

Section: Influence Of Ternary Elements On Oxidation Resistancementioning

confidence: 99%

Solid-State Processing Route, Mechanical Behaviour, and Oxidation Resistance of TiAl Alloys

Cobbinah

Matizamhuka

2019

Advances in Materials Science and Engineering

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“…For example, a focus on controlling the TiAl microstructure and alloying has been proposed. The alloying of γ +α 2 TiAl with chromium improves the plasticity of TiAl at room temperature, increases the fracture toughness and the oxidation resistance [2,3,4]. In present work, the simulation of shear ruptures in γ-TiAl in the presence of vacancy-type defects or chromium substitution atoms was performed to estimate their influence on TiAl shear resistance.…”

Section: Introductionmentioning

confidence: 99%

Computer Simulation of Plastic Deformation in Tial Alloys in the Presence of Chromium

Gnidenko

2018

DDF

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Quantum-mechanical calculations were used to investigate shear rupture in intermetallic titanium aluminide (TiAl) alloys in the presence of vacancy or chromium dopant. The substitution of both Ti and Al atoms by Cr atoms in the γ-TiAl crystal lattice was considered. The simulation of shear was carried out in the (111) slip plane along two directions, namely the [110] and [11-2]. The decrease in the shear resistance of the defects present in the γ-TiAl lattice was estimated. It was shown that when chromium occupies a titanium vacancy, it can compensate for this defect by increasing the shear modulus for the {111} <110> slip system.

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“…For the Cr-modified aluminide coating on TiAl alloys, the formation of the Al67Ti25Cr8 phase improves stability during cyclic oxidation [15]. The high Cr content TiAl-Cr alloy also promotes dense and compact Al2O3 and TiO2 oxide scales [16].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and oxidation behavior of Al + Cr co-deposited coatings on nickel-based superalloys

Lin¹,

Liu³

et al. 2017

Surface and Coatings Technology

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The microstructure and oxidation behavior were investigated in Al and Cr co-deposited diffusion coatings prepared by the pack cementation process. The composition (in wt.%) of the packs was 3NH4Cl-xAl-(25-x)Cr-72Al2O3 with different Al levels (x = 0.5, 1.2, 4, and 10). After the heat-treatment process, the corresponding microstructure of the coatings was Cr + Cr2Ni3 + Al-rich phase, Cr + Cr2Ni3, Cr + NiAl + Ni3Al and NiAl + AlCr2, respectively. The isothermal oxidation tests were performed at 950 °C for up to 100 h in air, and the oxidation kinetic curves were obtained. It indicated that the coatings formed in the packs containing 1.2 wt.% Al had the lowest weight gain, while the weight gain of the coating formed in the packs having 4 wt.% Al was the largest. The presence of Cr in Al and Cr co-deposited coatings promotes Al2O3 generation. The formation mechanisms of Al + Cr co-deposited coatings and the effect of Cr in different types of coatings during the oxidation process were discussed.

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Oxidation behavior of TiAl alloy treated by plasma surface chromizing process

Cited by 12 publications

References 10 publications

Solid-State Processing Route, Mechanical Behaviour, and Oxidation Resistance of TiAl Alloys

Solid-State Processing Route, Mechanical Behaviour, and Oxidation Resistance of TiAl Alloys

Computer Simulation of Plastic Deformation in Tial Alloys in the Presence of Chromium

Microstructure and oxidation behavior of Al + Cr co-deposited coatings on nickel-based superalloys

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