Formation of intermetallics in a porous powder titanium-nickel diffusion couple

Drozdov, I. A.

doi:10.1007/bf00560131

Cited by 5 publications

(3 citation statements)

References 5 publications

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“…Compared with a solid Sb foil or disc, the Sb porous powder can accelerate the diffusion process. It has been found that the more rapid intermetallic layer growth in porous powder than in solid diffusion couples [22]. Since the present work aims to study the intermetallic compounds formed among Ce, Sb and Fe, and evaluate their thermodynamic stability, the results should not be affected by the physical form.…”

Section: Ce-sb-fe Diffusion Couplementioning

confidence: 99%

Thermodynamic stability studies of Ce-Sb compounds with Fe

Xie

Zhang

Benson

et al. 2018

Journal of Nuclear Materials

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Lanthanide fission products can migrate to the fuel periphery and react with cladding, causing fuelcladding chemical interaction (FCCI). Adding a fuel additive dopant, such as Sb, can bind lanthanide, such as Ce, into metallic compounds and thus prevent migration. The present study focuses on the thermodynamic stability of Ce-Sb compounds when in contact with the major cladding constituent Fe by conducting diffusion couple tests. Ce-Sb compounds have shown high thermodynamic stability as they did not react with Fe. When Fe-Sb compounds contacted with Ce, Sb was separated out of Fe-Sb compounds and formed the more stable Ce-Sb compounds.

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Section: Ce-sb-fe Diffusion Couplementioning

confidence: 99%

Thermodynamic stability studies of Ce-Sb compounds with Fe

Xie

Zhang

Benson

et al. 2018

Journal of Nuclear Materials

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“…With the increase in heat treatment time, more Ni elements diffuse into Ti substrate, which promotes the formation of β‐Ti phase and keeps the existence of β‐Ti phase when cooled down. Drozdov [ 35 ] also found that with the increase in interdiffusion time, the thickness of β‐Ti layer with long blocky structure increases.…”

Section: Resultsmentioning

confidence: 99%

Failure Process Observation and Failure Mechanism of Ni‐Coated TC4 Alloy by Gradually Changed Curvature Bending Method

et al. 2021

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To observe the failure process of coating/substrate materials, a gradually changed curvature bending (GCCB) method is proposed, and the relevant equipment is developed. Before GCCB experiment, Ni-coated Ti6Al4V (TC4) samples were prepared. The effect of vacuum heat treatment on the microstructure at Ti/Ni interface is discussed. With the increase in heat treatment time, intermetallic compounds of TiNi 3 , TiNi, and Ti 2 Ni start to form. Kirkendall void forms in Ni coating at first, and then the pore number decreases due to interdiffusion. Based on the interdiffusion of Ni into TC4 substrate, β-Ti phase forms at the surface region. The whole failure process of Ni-coated TC4 sample by GCCB experiment is observed and analyzed. With the increase in bending curvature, the fracture order of each layer is TiNi 3 > Ti 2 Ni > TiNi. With the increase in heat treatment time, the bonding property of the coating first increases and then decreases, and the failure mode also changes. The failure occurs at TiNi 3 layer when the heat treatment time is 60 min. When the heat treatment time is 120 min, the bonding property of the coating is the highest and surface vertical crack occurs. When treated 180 min, failure occurs at Ti 2 Ni layer.

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“…Previously porous titanium alloys have been fabricated using many different powder metallurgy (PM) methods, including conventional sintering (CS) [9], self-propagating high-temperature synthesis (SHS) [10][11] and traditional hot isostatic pressing (HIP) processes [12,13]. However, there are still some problems to be solved [14][15][16] because the pore characteristics and porosity cannot be accurately controlled. Obviously, conventional sintering has some advantage like cost reduction, very high level of purity and uniformity, preservation of purity and stabilization of the details of repetitive operations.…”

Section: Introductionmentioning

confidence: 99%

The Porous TiNb<sub>24</sub>Zr<sub>4</sub> Alloys with Controllable Porosity Fabricated by Conventional Sintering

Cui

Yang

et al. 2011

AMR

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In the present study, porous titanium alloys were fabricated successfully by mixing titanium, niobium, and zirconium powder with pore-forming agent of ammonium bicarbonate via conventional sintering method. The pore characteristics, such as pore morphology and distribution, mean pore size and porosity of prepared porous TiNb24Zr4alloy were investigated by optical microscopy, image processing and density determination. It was found that the pore characteristics mainly depended on the shape and size of used ammonium bicarbonate particles in present study. The porosity of the alloys could be tailored by controlling the amount of ammonium bicarbonate addition. The porous TiNb24Zr4alloys were near β type titanium alloys, which consisted mainly of β phase and a little of α phase. The amount of α phase increased in the porous alloys due to segregation caused by the addition of pore-forming agent.

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Formation of intermetallics in a porous powder titanium-nickel diffusion couple

Cited by 5 publications

References 5 publications

Thermodynamic stability studies of Ce-Sb compounds with Fe

Thermodynamic stability studies of Ce-Sb compounds with Fe

Failure Process Observation and Failure Mechanism of Ni‐Coated TC4 Alloy by Gradually Changed Curvature Bending Method

The Porous TiNb<sub>24</sub>Zr<sub>4</sub> Alloys with Controllable Porosity Fabricated by Conventional Sintering

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