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In nickel-based superalloys, regions of Ni 3 Al (called γ' phase) precipitate out of the nickel-rich matrix (called γ phase) to give high strength and creep resistance. Many alloy formulations are available and they usually include other elements, such as chromium, molybdenum, and iron, in order to improve various properties.
In electrical engineering, three-phase electric power systems have at least three conductors carrying alternating voltages that are offset in time by one-third of the period. A three-phase system may be arranged in delta (∆) or star (Y) (also denoted as wye in some areas, as symbolically it is similar to the letter 'Y').
Ni 3 Nb very small disks This precipitate is coherent with γ'. It is the main strengthening phase in IN-718, but γ'' dissolves at high temperatures. η GCP D0 24 (ordered HCP) Ni 3 Ti may form cellular or Widmanstätten patterns The phase is not the worst, but it is not as good as γ'. It can be useful in controlling grain boundaries. δ not ...
A three-phase induction motor has a simple design, inherently high starting torque and high efficiency. Such motors are applied in industry for many applications. A three-phase motor is more compact and less costly than a single-phase motor of the same voltage class and rating, and single-phase AC motors above 10 hp (7.5 kW) are uncommon. Three ...
During the activation process, Al is leached out of the NiAl 3 and Ni 2 Al 3 phases that are present in the alloy, while most of the Ni remains, in the form of NiAl. The removal of Al from some phases but not others is known as "selective leaching". The NiAl phase has been shown to provide the structural and thermal stability of the catalyst.
Nickel(I) complexes are uncommon, but one example is the tetrahedral complex NiBr(PPh 3) 3. Many nickel(I) complexes have Ni–Ni bonding, such as the dark red diamagnetic K 4 [Ni 2 (CN) 6] prepared by reduction of K 2 [Ni 2 (CN) 6] with sodium amalgam. This compound is oxidized in water, liberating H 2. [44]
Ni 31 Si 12, Ni 2 Si, and NiSi have congruent melting points; the others form via a peritectic transformation. [ citation needed ] The silicides can be made via fusion or solid state reaction between the elements, diffusion at a junction of the two elements, and other methods including ion beam mixing.
Nickel borides include forms Ni 2 B (a green/black solid), NiB, Ni 3 B, o-Ni 4 B 3 and m-Ni 4 B 3. [8] Nickel hydride NiH is only stable under high pressures of hydrogen. Nickel silicides include Ni 3 Si, [9] Ni 31 Si 12, Ni 2 Si, Ni 3 Si 2, NiSi and NiSi 2. [10] Nickel silicides are used in microelectronics.