Nitridation of niobium-46 wt.% titanium alloy in nitrogen at 1300 °C

Buscaglia, Vincenzo; Bottino, C.; Musenich, R.; Fabbricatore, P.; Gemme, G.; Parodi, R.; Zhang, B.; Parodi, Patricio

doi:10.1016/0925-8388(95)01614-7

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…The intensity of the third and fourth peaks, which occurs at a higher temperature, near 530 K and 550 K, respectively, increases with increasing nitrogen contents and certainly might be interpreted as caused by a relaxation process due to the interaction of single nitrogen atoms with single niobium and titanium atoms of the metallic matrix. In this case, the affinity of nitrogen with niobium is larger than with titanium [3], and the third process was attributed to the stress-induced ordering of single nitrogen atoms around single niobium atoms. The fourth process was then attributed to the stress-induced ordering of nitrogen atoms around titanium atoms of the matrix.…”

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confidence: 89%

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Anelastic Relaxation Measurements in Nb-46wt%Ti Alloys with Interstitial Solutes in Solid Solution

Grandini

Florêncio²,

Filho³

2012

SSP

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Anelastic relaxation measurements were performed in a Nb-46wt%Ti alloy, in the temperature range of 300 to 700 K, using a torsion pendulum operating at an oscillating frequency near 2.0 Hz. The samples were measured in different conditions: cold worked, annealed in ultra-high vacuum and doped with several quantities of nitrogen. The relaxation spectra obtained were resolved into their component peaks, corresponding to the different kinds of interaction of the interstitial solutes with the metallic matrix. The relaxation parameters of each process were calculated using Debye’s elementary peaks.

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confidence: 89%

“…These metals are able to dissolve great amounts of oxygen and nitrogen, for example, to form solid solutions. Oxygen and nitrogen act as strong agents for the stabilization of the α phase at low temperatures [3].…”

Section: Introductionmentioning

confidence: 99%

Anelastic Relaxation Measurements in Nb-46wt%Ti Alloys with Interstitial Solutes in Solid Solution

Grandini

Florêncio²,

Filho³

2012

SSP

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“…The influence of alloying elements on the nitrogen content of niobium has been studied. The regularities of nitriding of niobium alloys, the influence of temperature, duration of processing and alloying elements on the structure, phase composition and hardness of diffusion layers have been studied [16]. It is established that β-nitride of the NbN type is formed on the surface of Nb alloys nitrided in the range of 600-800 °С, and a more stable ν-modification of the nitride of the same type is formed in the range of 900-1000 °С.…”

Section: Problem Statusmentioning

confidence: 99%

Heat protective coatings on niobium alloys

Babak

Lyashenko

Щепетов

et al. 2020

Mechanics and Advanced Technologies

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The article shows that during plasma-diffusion deposition, a multilayer coating was formed on the surface of the niobium alloy. A highly porous plasma-sprayed layer of molybdenum silicide has a significant spread in thickness (h=100...350 μm, Hμ20=6880 MPa). When studying the microstructure of samples with a plasma-diffusion coating after testing, it was found that cracks in the coating originate in the process of creep, mostly at the interface between the plasma and diffusion layers of the coating. The source of their origin is individual discontinuities in the diffusion layer as delivered. Crack propagation occurs both into the plasma and diffusion layers of the coating. Crack growth in the plasma layer is inhibited due to the rounded nature of the pores and the increased plasticity of this layer. The growth of cracks deep into the sample is, as a rule, inhibited by a boride sublayer. The advantage of plasma-diffusion technology provided an increased plasticity of the coating, the presence of thin barrier sublayers, a discontinuous coating structure, the presence of low-melting compounds that contribute to the healing of defects in the coating, an increase in its corrosion resistance and resistance to thermal fatigue destruction. The combination of these properties made it possible to provide an increase in durability compared to silicide and borosilicide coatings under conditions of isothermal creep in air (1400 °C, 50 MPa) 1.9...3.7 times and under conditions of thermal cyclic creep (1400-250 °C, 50 MPa) in 6.8...8.5 times. It has been determined that the use of a discrete structure will increase the thickness of the coating layer and ensure an increase in their working properties.

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EPMA of spinodal-like decomposition patterns in (TixNb1 ?x)N

Wollein

Buscaglia²,

Lengauer

et al. 2000

Surf. Interface Anal.

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Although TiN and NbN are known to form a complete quasibinary solid solution, it was found that upon nitridation of Ti/Nb or annealing of (Ti,Nb)N alloys the formation of large lamellae occurs, which could be optically distinguished by their golden yellow (Ti-rich) and light yellow (Ti-poor) colour. Such structures at much smaller scales are known to result from spinodal decomposition.In order to characterize the decomposition process, the samples were investigated by wavelength-dispersive electron probe microanalysis. The measurement conditions were adjusted in order to account for the Ti Ll and N Ka overlap, as well as to take an appropriate mass absorption coefficient for N in Nb into consideration. Different acceleration voltage for electron probe microanalysis were applied, which showed that the problem can be overcome by tuning the measurement conditions.

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Nitridation of niobium-46 wt.% titanium alloy in nitrogen at 1300 °C

Cited by 10 publications

References 28 publications

Anelastic Relaxation Measurements in Nb-46wt%Ti Alloys with Interstitial Solutes in Solid Solution

Anelastic Relaxation Measurements in Nb-46wt%Ti Alloys with Interstitial Solutes in Solid Solution

Heat protective coatings on niobium alloys

EPMA of spinodal-like decomposition patterns in (TixNb1 ?x)N

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