Formation of aluminide phases on electrodeposited nanocrystalline nickel

Rashidi, A.M.; Amadeh, A.

doi:10.1016/j.intermet.2010.04.005

Cited by 17 publications

(7 citation statements)

References 27 publications

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“…The Fe-Al intermetallic phases, FeAl 3 and Fe 2 Al 5, were detected clearly due to the powder pack contained high Al amount up to 25 wt.% [16][17][18]. Also, the aluminized layers increase with increasing aluminizing time taking into account diffusion theory [19][20][21][22][23]. The squared thickness of aluminized layer as a function of time can be explained in Eq.…”

Section: Non-deep Rolled Austenitic Stainless Steel Aisi 304mentioning

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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Section: Non-deep Rolled Austenitic Stainless Steel Aisi 304mentioning

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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“…Aluminizing is an important treatment process, used for nickel and nickel alloys, in which the substrate surface is enriched with aluminum. The process allows for an improvement in the resistance of the metallic components to high‐temperature environmental interactions, and helps prevent corrosion and oxidation of the parts working in extreme conditions . The quality and utility of the aluminized parts depend on the final composition of the synergistic layer/substrate system.…”

Section: Introductionmentioning

confidence: 99%

“…The pre‐eminent phase is β ‐NiAl which has low density, 5.9 g cm −3 , excellent heat resistance (even when compared to other aluminides), and good mechanical properties, such as high specific strength. The very good heat resistance of β ‐NiAl is because of its propensity to the formation of a Al 2 O 3 ‐rich protective layer …”

Section: Introductionmentioning

confidence: 99%

Aluminizing of Nickel Alloys by CVD. The Effect of HCl Flow

Wierzba

Tkacz–Śmiech

Nowotnik

et al. 2014

Chemical Vapor Deposition

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The solid-state diffusion in binary and ternary systems is overall treated and modeled using the bi-velocity method. The mathematical formulation is given, and the boundary conditions discussed. The model allows the calculation of concentration profiles, spatial distribution of the entropy production rate, and diffusion path. The last two can be used to identify the phases present in the diffusion zone of the ternary system, and determine the thicknesses of the respective layers. The model is applied for the first time to simulate diffusion during aluminization of nickel and its super-alloys, MAR-M200 þ Hf and CMSX-4, and the predictions are compared with the results of the experiments performed by the authors. The results give a new quantitative explanation of the high-active and low-active regimes of aluminization. It is, in particular, confirmed that the high-active and low-active regimes of nickel aluminization can be carried out by a variation of the HCl/H 2 flow ratio. The most important, and a brand new, result concerns the entropy production rate. It is shown that its maxima coincidence with the two-phase zone boundaries in real space, which gives new insight into the modeling of the diffusion in ternary systems.

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“…Metallic components that operate at high temperatures and in corrosive environments, such as turbine‐engine elements made of nickel alloys, can be protected by layers of intermetallic phases of enhanced corrosion‐ and wear‐resistance, and high electrical and thermal conductivities . A good way of preventing the degradation of nickel‐base superalloys is to form nickel‐aluminum intermetallic layers.…”

Section: Introductionmentioning

confidence: 99%

“…A layer of β ‐NiAl phase of good stability and exceptional corrosion resistance is particularly useful . The resistance to high temperature oxidation of aluminides can be additionally improved through the formation of a A1 2 O 3 ‐rich protective layer …”

Section: Introductionmentioning

confidence: 99%

Reactive Mass Transport during the Aluminization of Rene‐80

Wierzba

Tkacz–Śmiech

Nowotnik

2013

Chemical Vapor Deposition

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A bi-velocity method is used to simulate the element-concentration evolution in the diffusion zone during the aluminization of a Rene-80 nickel-based superalloy. The basis of the method and the detailed calculations are presented. The model enables the prediction of the formation of intermetallic phases and multi-phase layers. The entropy-production rate can also be calculated, and it is shown that it might serve as a basis to indicate the interphases. The proposed model is applied to model the diffusion in a ternary Al-Cr-Ni system. The results of the calculations are compared with experimental element-concentration profiles, measured for the Rene-80 alloy subjected to aluminization by CVD.

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Formation of aluminide phases on electrodeposited nanocrystalline nickel

Cited by 17 publications

References 27 publications

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

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

Aluminizing of Nickel Alloys by CVD. The Effect of HCl Flow

Reactive Mass Transport during the Aluminization of Rene‐80

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