Effect of hot-dip aluminizing on the oxidation resistance of Ti–6Al–4V alloy at high temperatures

Zhang, Z.G.; Peng, Yuxing; Mao, Y. L.; Pang, C.J.; Lü, Lei

doi:10.1016/j.corsci.2011.10.029

Cited by 76 publications

(37 citation statements)

References 34 publications

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“…TiAl 3 obtained by hot-dip aluminizing followed by interdiffusion heat treatment exhibited a lower oxidation rate in comparison with the Ti-6Al-4V alloy at 800°C and lower temperatures during cyclic oxidation [41]. The oxidation kinetics followed parabolic relations at 700°C and 800°C during the isothermal oxidation [34]. The addition of Ni, Si, and Cr in the aluminide bath formed a diffusion barrier and prolonged the lifetime of the protective aluminides [30].…”

Section: Introductionmentioning

confidence: 89%

“…Pure Ti, Ti based alloys and Ti intermetallics have been aluminized in order to improve their high temperature oxidation properties using various methods (laser surface alloying [23], magnetron sputtering [24], thermal spray [25]); however, the two most common methods used for Ti aluminizing are pack cementation aluminizing [26][27][28][29] and hot dip aluminizing [30][31][32][33][34].…”

Section: Introductionmentioning

confidence: 99%

“…The hot-dip aluminizing process consists essentially of immersion of titanium/titanium alloy in a bath of molten aluminum or aluminum alloy bath for a certain time, followed by diffusion annealing [34,40].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Molybdeno-Aluminizing of Powder Metallurgy and Wrought Ti and Ti-6Al-4V alloys by Pack Cementation process

Tsipas

Gordo

2016

Materials Characterization

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Wear and high temperature oxidation resistance of some titanium-based alloys needs to be enhanced, and this can be effectively accomplished by surface treatment. Molybdenizing is a surface treatment where molybdenum is introduced into the surface of titanium alloys causing the formation of wear-resistant surface layers containing molybdenum, while aluminizing of titanium-based alloys has been reported to improve their high temperature oxidation properties. Whereas pack cementation and other surface modification methods have been used for molybdenizing or aluminizing of wrought and/or cast pure titanium and titanium alloys, such surface treatments have not been reported on titanium alloys produced by powder metallurgy (PM). Also a critical understanding of the process parameters for simultaneous one step molybdeno-aluminizing of titanium alloys by pack cementation and the predominant mechanism for this process have not been reported. The current research work describes the surface modification of titanium and Ti-6Al-4V prepared by PM by molybdeno-aluminizing and analyzes thermodynamic aspects of the deposition process. Similar coatings are also deposited to wrought Ti6Al-4V and compared. Characterization of the coatings was carried out using scanning electron microscopy and x-ray diffraction. For both titanium and Ti-6Al-4V, the use of a powder pack containing ammonium chloride as activator leads to the deposition of molybdenum and aluminium into the surface but also introduces nitrogen causing the formation of a thin titanium nitride layer. In addition, various titanium aluminides and mixed titanium aluminium nitrides are formed. The appropriate conditions for molybdeno-aluminizing as well as the phases expected to be formed were successfully determined by thermodynamic equilibrium calculations.

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Section: Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

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Molybdeno-Aluminizing of Powder Metallurgy and Wrought Ti and Ti-6Al-4V alloys by Pack Cementation process

Tsipas

Gordo

2016

Materials Characterization

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“…Accordingly, various surface treatments are mentioned to improve the oxidation and corrosion resistance. An aluminizing process is a wellknown thermochemical surface treatment to add as well as diffuse aluminium atoms into the surface of stainless steels or nickel base alloys, whereas a superior high-temperature oxidation resistance is reported in [4][5][6]. The aluminizing process is usually operating at a relatively high temperature of 800-1000 • C with pro-longed soaking time taking into account the diffusion concept.…”

Section: Introductionmentioning

confidence: 99%

Diffusion enhancement of low-temperature pack aluminizing on austenitic stainless steel AISI 304 by deep rolling process

Yutanorm¹,

Juijerm²

2016

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The deep rolling process is a mechanical surface treatment which plastically deforms only the surface and near-surface regions. The deep rolled AISI 304 austenitic stainless steel has been investigated to illustrate the near-surface plastic deformation effect on the aluminium diffusion rate in the low-temperature pack aluminizing process. Near-surface properties such as residual stresses and full width at half maximum (FWHM) values were measured using the X-ray diffractometer (XRD). The deep rolled, and non-deep rolled specimens were aluminized using powder pack method at the relatively low temperature of 550 • C for about 2-8 h. A scanning electron microscope (SEM) with energy dispersive X-ray spectrometer (EDS) and XRD were used to characterize the surface layers. It was found that the deep rolled condition shows the higher diffusion coefficient as compared to the non-deep rolled condition. Finally, it can be mentioned that the deep rolling process can enhance the diffusion rate of the pack aluminizing treatment at the temperature of 550 • C.

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“…The components of powder metallurgy are observed with lesser density compared to wrought materials, but which fulfills the required parameters for the industrial applications. The strength of the P/M components can be enhanced through the strengthening mechanism such as cold upsetting processes [22,23]. Titanium alloys metal matrix composites manufactured through conventional powder metallurgy reveal an excellent combination of improved properties of toughness and strength, which disables the extreme brittleness of titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Densification Behaviour on Yttrium Oxide Reinforced Ti-6AL-4V Nano-Composite Through Powder Metallurgy

Ramaswamy¹,

Tjprc²

2018

IJMPERD

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Titanium based alloys are attracted in many applications due to its excellent properties. But it is not suitable for high temperature components due to poor performance at elevated temperatures. In this paper, a new attempt is done to improve its high temperature performance by adding yttrium oxide (Y 2 O 3 ) as reinforcement in a titanium alloy matrix.Yttrium oxide reinforced Ti-6Al-4V nano-composite was manufactured through powder metallurgy technique. Yttrium oxide was added in a range of 1-3% with matrix metal. The compaction pressure of 560 MPa was determined by using powder compression techniques. The composite preforms was made by cold compaction and green compacts were sintered through pressureless sintering process at a temperature range of 1200-1400 o C to improve the densification behaviour. Densities of preforms were measured by using analytical and Archimedes' principles to determine the densification behaviour of nano-composite. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) were used to confirm the distribution of reinforcement with matrix metal. The nano-composite prepared by adding 2% of yttrium oxide provides higher densification behaviour compared to other additions of reinforcements.

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Effect of hot-dip aluminizing on the oxidation resistance of Ti–6Al–4V alloy at high temperatures

Cited by 76 publications

References 34 publications

Molybdeno-Aluminizing of Powder Metallurgy and Wrought Ti and Ti-6Al-4V alloys by Pack Cementation process

Molybdeno-Aluminizing of Powder Metallurgy and Wrought Ti and Ti-6Al-4V alloys by Pack Cementation process

Diffusion enhancement of low-temperature pack aluminizing on austenitic stainless steel AISI 304 by deep rolling process

Investigation of Densification Behaviour on Yttrium Oxide Reinforced Ti-6AL-4V Nano-Composite Through Powder Metallurgy

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