Synthesis of niobium aluminides by electro-deoxidation of oxides

Xiao, Yao; Fray, Derek J.

doi:10.1016/j.jallcom.2009.06.176

Cited by 25 publications

(13 citation statements)

References 40 publications

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“…Other niobium-based alloys that were synthesized via the electro-deoxidation process in molten CaCl 2 include: Nb–Si, Nb–9Hf–Ti . Ta–Nb, Nb 3 Al, and Nb 2 Al …”

Section: Electro-deoxidation Under Controlled Voltage or Potentialmentioning

confidence: 99%

DC Voltammetry of Electro-deoxidation of Solid Oxides

et al. 2013

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“…Other niobium-based alloys that were synthesized via the electro-deoxidation process in molten CaCl 2 include: Nb–Si, Nb–9Hf–Ti . Ta–Nb, Nb 3 Al, and Nb 2 Al …”

Section: Electro-deoxidation Under Controlled Voltage or Potentialmentioning

confidence: 99%

DC Voltammetry of Electro-deoxidation of Solid Oxides

et al. 2013

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“…Some of the most promising are intermetallic compounds in the niobium-aluminium system [1,2]. These intermetallics are expected to be usable as structural materials at higher temperatures than conventional nickel-based superalloys because of their higher melting temperature and lower density [3]. However, binary Nb-Al intermetallics have low fracture toughness at ambient temperature.…”

Section: Introductionmentioning

confidence: 99%

Metallurgical Preparation of Nb–Al and W–Al Intermetallic Compounds and Characterization of Their Microstructure and Phase Transformations by DTA Technique

et al. 2020

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The possibilities of metallurgical preparation of 40Nb-60Al and 15W-85Al intermetallic compounds (in at.%) by plasma arc melting (PAM) and vacuum induction melting (VIM) were studied. Both methods allow easy preparation of Nb–Al alloys; however, significant evaporation of Al was observed during the melting, which affected the resulting chemical composition. The preparation of W–Al alloys was more problematic because there was no complete re-melting of W during PAM and VIM. However, the combination of PAM and VIM allowed the preparation of W–Al alloy without any non-melted parts. The microstructure of Nb–Al alloys consisted of Nb2Al and NbAl3 intermetallic phases, and W–Al alloys consisted mainly of needle-like WAl4 intermetallic phase and Al matrix. The effects of melting conditions on chemical composition, homogeneity, and microstructure were determined. Differential thermal analysis was used to determine melting and phase transformation temperatures of the prepared alloys.

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“…[1][2][3] Three intermetallic compounds are present in the Nb-Al binary system including Nb 3 Al (A15 structure), Nb 2 Al (D8b structure) and NbAl 3 (DO22 structure, TiAl 3 type). [4][5][6][7] Among the various compounds in the Nb-Al system (Figure 1), NbAl 3 with its high melting point (1680°C), low density (4.54 g/cm 3 ), is attractive as a potential material for high-temperature applications. 6,8 The applications of NbAl 3 include its use in turbine blades in aircraft engines or in stationary gas turbines.…”

Section: Introductionmentioning

confidence: 99%

Effect of holding time on the production of Nb-NbAl3 intermetallic composites via electric-current-activated sintering

Aybey¹,

Yener²,

İpek³

et al. 2017

Mater. Tehnol.

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A recently developed powder metallurgy processing technique -Electric Current Activated (Assisted) Sintering (ECAS) was employed to produce intermetallic Nb-NbAl3 composites. In this study, to produce Nb-NbAl3 in-situ intermetallic composites, Nb (99.8 % purity, less than 44 μm) and Al (99.5 % purity, less than 44 μm) elemental powders were mixed in the stoichiometric ratio corresponding to the Nb-Al phase diagram. The effect of different processing times, for (10, 30, 60) s, under maximum of 2000 A and 1.5-2.0 V, was investigated. Scanning electron microscopy and X-ray diffraction analysis were used to characterize the produced samples. X-ray diffraction studies revealed that the dominant phases are NbAl3 and Nb. Scanning electron microscopy examinations showed a dense microstructure with a very low amount of porosity and also a trace amount of residual aluminium. The microhardness of the test materials sintered for 60 s via electric-current-activated sintering was about 405 HV±46 HV0,05. Keywords: in situ composites, NbAl 3 aluminides, electric current activated sintering (ECAS) Pred kratkim razvita tehnika v metalurgiji prahov: sintranje, aktivirano z elektri~nim tokom (ECAS), je bilo uporabljeno za in situ izdelavo intermetalnega kompozita Nb-NbAl3. V {tudiji sta bila za in situ proizvodnjo Nb-NbAl3 intermetalnega kompozita zme{ana elementna prahova Nb (99.8 %~istost, delci manj{i od 44 μm) in Al (99.5 %~istost, delci manj{i od 44 μm), zme{ana v stehiometri~nem razmerju, skladno s faznim diagramom Nb-Al. Preiskovan je bil vpliv razli~nih~asov izdelave: (10, 30, 60) s pri toku maksimalno 2000 A in napetosti 1,5-2,0 V. Izdelani vzorci so bili karakterizirani z vrsti~no elektronsko mikroskopijo in rentgensko difrakcijo. Rentgenska difrakcija je odkrila, da sta prevladujo~i fazi NbAl3 in Nb. Vrsti~na elektronska mikroskopija je pokazala gosto mikrostrukturo z majhnim dele`em poroznosti in sledovi preostalega aluminija. Mikrotrdota preizkusnega materiala, sintranega 60 s, s sintranjem aktiviranim z elektri~nim tokom, je bila okrog 405 HV±46 HV0,05. Klju~ne besede: in situ kompoziti, NbAl3 aluminidi, sintranje aktivirano z elektri~nim tokom (ECAS)

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Synthesis of niobium aluminides by electro-deoxidation of oxides

Cited by 25 publications

References 40 publications

DC Voltammetry of Electro-deoxidation of Solid Oxides

DC Voltammetry of Electro-deoxidation of Solid Oxides

Metallurgical Preparation of Nb–Al and W–Al Intermetallic Compounds and Characterization of Their Microstructure and Phase Transformations by DTA Technique

Effect of holding time on the production of Nb-NbAl3 intermetallic composites via electric-current-activated sintering

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