Hexagonal close packed nickel powder: Synthesis, structural characterization and thermal behavior

Carturan, G.; Cocco, G.; Enzo, Stefano; Ganzerla, Renzo; Lenarda, Maurizio

doi:10.1016/0167-577x(88)90080-8

Cited by 70 publications

(44 citation statements)

References 19 publications

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“…Particles of internal oxides form but extensive pits are absent where V is the molar volume of the respective phase, given as M/q where M is the molecular mass of the phase and q its density. The values used for the densities are q Al 2 O 3 = 3.987 kg m -3 [17], q Ni 3 Al = 7.399 kg m -3 [18] and q Ni = 7.372 kg m -3 [19]. This volumetric expansion initially develops a large compressive stress which is relaxed by creep of the relatively weak c matrix.…”

Section: Mechanism Of Pit Formationmentioning

confidence: 99%

Intermediate Temperature Internal Oxidation in Fourth Generation Ru-bearing Single-Crystal Nickel-base Superalloys

et al. 2007

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Fourth-generation, Ru-bearing, Ni-base superalloys offer superior microstructural stability over previous generations, affording greater density-corrected creep strength, but in common with their predecessors, have only borderline ability to form and maintain a protective oxide layer. This is particularly so at intermediate temperatures of around 750°C at which temperature internal oxidation can occur. In this present study, the nature of this attack has been examined in experimental 3 and 5 mass % Ru alloys. Both these alloys exhibited dispersed regions of oxide-filled pits whose depth increased parabolically with isothermal exposure time at a similar rate. Pits appear to nucleate progressively straight from the initial competitive oxidation stage. In all cases, the pits were associated with a surface mound of nickel-and cobalt-rich oxides. The results of detailed metallographic examination of the internal oxidation products are provided.

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Section: Mechanism Of Pit Formationmentioning

confidence: 99%

Intermediate Temperature Internal Oxidation in Fourth Generation Ru-bearing Single-Crystal Nickel-base Superalloys

et al. 2007

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“…In Figure 5a it is noticed that the XRD pattern presents some peaks related to Ni and Mo crystalline phases in metallic state, typical of each powder. Moreover, in Figure 5b, it is noticed that the XRD pattern for the Ni-Mo alloy presents peaks related to MoNi 4 crystalline phase 11 , typical of the Ni-Mo alloys, peaks related to Ni crystalline phase and peaks related to MoC 2 crystalline phase 12,13 . This last phase is predominantly superficial and its amount was decrease after cleaning the sample surface.…”

Section: Structural Characterization By X-ray Diffractionmentioning

confidence: 99%

Synthesis and characterization of Ni-Mo filler brazing alloy for Mo-W joining for microwave tube technology

Sene

Motta

2013

Mat. Res.

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A brazing process based on Ni-Mo alloy was developed to join porous tungsten cathode bottom and dense molybdenum cathode body for microwave tubes manufacture. The Ni-Mo alloy was obtained by mixing and milling powders in the eutectic composition, and applied on the surface of the components. The brazing was made at 1400 °C by using induction heating in hydrogen for 5 minutes. Alumina surfaces were coated with the binder and analyzed by Energy Dispersive X-rays Fluorescence. The brazed samples were analyzed by Scanning Electron Microscopy coupled to Energy Dispersive Spectroscopy. Stress-strain tests were performed to determine the mechanical behavior of the joining. The quality of the brazing was evaluated by assuring the presence of a "meniscus" formed by the Ni-Mo alloy on the border of the tungsten and molybdenum joint, the absence of microstructural defects in the interface between the tungsten and molybdenum alloys, and the adhesion of the brazed components.

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“…The EBSD data was gathered using a Zeiss Supra 55 VP-FEG SEM operating at 20 keV with an HKL Channel 5 system and a Nordlys II CCD camera. Individual EBSD patterns were analyzed using crystallographic input structures of Ni-fcc, Ni-hcp (a ¼ 2.6515A, c ¼ 4.343A PDF#00-045-1027 [21] ), Ni 2 P, Ni 3 P, NiO, NiS, NiS 2 , and Ni 3 S 2 . The EBSD maps were taken with a step size of 10 nm per point with scans of 200 Â 200 steps.…”

mentioning

confidence: 99%

Competitive Abnormal Grain Growth between Allotropic Phases in Nanocrystalline Nickel

et al. 2010

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Hexagonal close packed nickel powder: Synthesis, structural characterization and thermal behavior

Cited by 70 publications

References 19 publications

Intermediate Temperature Internal Oxidation in Fourth Generation Ru-bearing Single-Crystal Nickel-base Superalloys

Intermediate Temperature Internal Oxidation in Fourth Generation Ru-bearing Single-Crystal Nickel-base Superalloys

Synthesis and characterization of Ni-Mo filler brazing alloy for Mo-W joining for microwave tube technology

Competitive Abnormal Grain Growth between Allotropic Phases in Nanocrystalline Nickel

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