Results 151 to 160 of about 318,126 (177)
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Coarsening kinetics of γ′ precipitates in Ni-Al and Ni-Al-Mo alloys
Journal of Materials Science, 1996The ordered L12 γ′ precipitate coarsening kinetics without the influence of an external stress were studied in a Ni-Al(13.5 at%) alloy at 1413 K and a Ni-Al(13.8 at%)-Mo(5.9 at%) alloy at 1443 K. The Ni-Al-Mo alloy has a lattice mismatch of about −0.3% at the ageing temperature while the Ni-Al has a positive lattice mismatch of about 0.25% at the ...
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Phase equilibria in nickel rich Ni–Al–Mo and Ni–Al–W alloys
Metal Science, 1983AbstractPhase equilibria have been investigated in the Ni rich regions of the Ni–Al–Mo system at 1473 K and of the Ni–Al–W system at 1523 and 1273 K using electron microprobe analysis, X-ray diffraction, and optical metallography. The phase relationships at 1473 and 1523 K are similar in the two systems showing three-phase equilibria of γ + γ′ + α (Mo ...
P. Nash, S. Fielding, D. R. F. West
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Coarsening kinetics of coherent precipitates in Ni-Al-Mo and Fe-Ni-Al alloys
Materials Science and Engineering: A, 1997Abstract The late stage coarsening kinetics of coherent γ′ and β′ have been investigated in single crystalline specimens of Ni-14.5 at.% Al-5.9 at.% Mo and Fe-10 at.% Ni-15 at.% Al after aging at 1453 K for the Ni alloy and 1233 K for the Fe alloy.
H.A. Calderon +5 more
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Development of Ni–Al and Ni–Al–Fe intermetallic coatings on carbon tool steels
Surface Engineering, 1997Intennetallic coatings of Ni–Al and Ni–Al–Fe have been developed on carbon tool steel substrates. Nickel coatings with thicknesses of 20 and 40 f.1m were deposited on prealuminised specimens. Diffusion annealing was subsequently carried out at a temperatureof 1050oe.
M. Salehi, M. Shamanian, F. Ashrafizadeh
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International Thermal Spray Conference, 2021
Abstract Ni-Al intermetallics have excellent corrosion and oxidation resistance, but their use in thermal spraying has been limited due to issues with in-flight oxidation. In this study, a novel approach is proposed to remove oxide from Ni-Al droplets in-flight by adding a deoxidizer (diamond) to the feedstock powder. A mixture of nickel,
Li Zhang +4 more
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Abstract Ni-Al intermetallics have excellent corrosion and oxidation resistance, but their use in thermal spraying has been limited due to issues with in-flight oxidation. In this study, a novel approach is proposed to remove oxide from Ni-Al droplets in-flight by adding a deoxidizer (diamond) to the feedstock powder. A mixture of nickel,
Li Zhang +4 more
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Physica Status Solidi (a), 1984
Stress relaxation and strain-rate cycling tests are conducted between room temperature and 800 °C to ascertain the deformation mechanisms in terms of “athermal” and thermally activated processes. Stress relaxation is analysed by using a computer program and incremental unloading technique.
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Stress relaxation and strain-rate cycling tests are conducted between room temperature and 800 °C to ascertain the deformation mechanisms in terms of “athermal” and thermally activated processes. Stress relaxation is analysed by using a computer program and incremental unloading technique.
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Journal of Thermal Analysis and Calorimetry, 2016
The relationship between the properties with the composition of nickel–aluminium mixed oxides was investigated in this work. Ni–Al materials with Ni/Al molar ratios between 0.5 and 9 were synthesised via co-precipitation. The samples were characterised using the following techniques: surface area measurements (S BET ...
Guilherme de Souza +2 more
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The relationship between the properties with the composition of nickel–aluminium mixed oxides was investigated in this work. Ni–Al materials with Ni/Al molar ratios between 0.5 and 9 were synthesised via co-precipitation. The samples were characterised using the following techniques: surface area measurements (S BET ...
Guilherme de Souza +2 more
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Modulated structures in Ni–Al–Cr alloy
Journal of Microscopy, 2006SummaryThe crystal structures of the different modulated and layered martensites in Ni–Al–Cr alloy have been observed. The layered martensite can be well described by the L10 lattice with seven‐layered or five‐layered long‐period stacking of {110} close‐packed planes of the parent phase.
Elzbieta, Jezierska, Mirosław, Pilawa
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The temporal evolution of the nanostructures of model Ni–Al–Cr and Ni–Al–Cr–Re superalloys
Zeitschrift für Metallkunde, 2005The temporal evolution of γ'(L1 2 )-precipitates in Ni-5.2 Al-14.2 Cr at.% and Ni-9.5 Al-8.6 Cr-2.0 Re at.% alloys are studied utilizing three-dimensional atom-probe microscopy. For the times investigated (0.0833 to 1024 h), these alloys exhibit a high number density (10 2 2 -10 2 4 m - 3 ) of spheroidal y'-precipitates, 0.45-30 nm in radius.
Kevin E. Yoon +3 more
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The coarsening of γ′ particles in NiAlMoTa and NiAlMoW alloys
Scripta Metallurgica, 1985Role des elements refractaires Mo, Ta et W dans les super-alliages a base de nickel; etude du grossissement de γ' dans des systemes quaternaires modeles en termes de morphologie et de composition du precipite et des changements de parametre cristallin. Alliages 75 Ni−15 Al−7,5 Mo−2,5 Ta et 75 Ni−15 Al−7,5 Mo−2,5 W (composition atomique)
S. Sadiq, D.R.F. West
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