Results 181 to 190 of about 11,912,762 (211)

Effects of nanoscale Ni, Al, and Ni–Al interlayers on nucleation and growth of diamond on Si

Journal of Vacuum Science & Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phenomena, 2010
Diamond nucleation experiments on Si wafers, precoated with Ni, Al, and Ni–Al duplex intermediate layers, have been conducted in a microwave plasma enhanced chemical vapor deposition reactor. The diamond nucleation density is dependent on the thickness of the single Ni interlayer and also the ratio of Ni/Al.
Y. S. Li, Y. Tang, Q. Yang, A. Hirose
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Ordering reactions in Ni-Al-Mo-Ta and Ni-Al-Mo-W superalloys

Metallurgical Transactions A, 1985
The ordered structures formed in two experimental nickel base superalloys have been determined using selected area electron diffraction. Upon quenching from 1300 °C, the alloys contained ordered γ′ precipitates (L12 structure) and the matrix exhibited diffuse intensity at {1 1/2 0} positions, indicating the presence of short range order.
J. C. Williams, P. L. Martin
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Martensitic transformation behavior in Ni–Al and Ni–Al–Re melt-spun ribbons

Scripta Materialia, 2004
Abstract The martensitic transformation behavior was investigated in rapidly solidified (melt-spun) Ni–(34–37)at%Al and Ni–(32–34)at%Al–2at%Re ribbons. The addition of Re increased the temperature for the formation of Ni 5 Al 3 , hence the martensitic transformations were observed at higher temperatures than those of binary Ni–Al alloys.
Hee Young Kim, Shuichi Miyazaki
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Coarsening kinetics of coherent precipitates in Ni-Al-Mo and Fe-Ni-Al alloys

Materials Science and Engineering: A, 1997
Abstract 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, G. Kostorz, Y.Y. Qu, H.J. Dorantes, J.J. Cruz, J.G. Cabanas-Moreno   +5 more
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Coarsening kinetics of γ′ precipitates in Ni-Al and Ni-Al-Mo alloys

Journal of Materials Science, 1996
The 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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Calculation of the Ni-Al-W, Ni-Al-Hf and Ni-Cr-Hf systems

Canadian Metallurgical Quarterly, 1975
AbstractComputer analysis of the W-Ni,W-Al, Ni-Al, Hf-Ni, Hf-Al, Hf-Cr, Al-W-Ni, Al-Ni-Hf and Hf-Cr-Ni systems has been carried out in order to predict the isothermal sections and liquidus projections for these systems. The present results indicate that the Al-W-Ni and Hf-Cr-Ni systems offer opportunities for the growth of in-situ composites by means ...
L. Kaufman, H. Nesor
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Phase equilibria in nickel rich Ni–Al–Mo and Ni–Al–W alloys

Metal Science, 1983
AbstractPhase 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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An investigation of the mechanism of thermally activated deformation in certain NiAlTa and NiAlHf superalloys

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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Development of Ni–Al and Ni–Al–Fe intermetallic coatings on carbon tool steels

Surface Engineering, 1997
Intennetallic 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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Influence of the Ni/Al ratio on Ni–Al mixed oxides and their catalytic properties for ethanol decomposition

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, Nilson Romeu Marcilio, Oscar William Perez-Lopez   +2 more
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