Electron microscopy and diffraction of ordering in NiW alloys

Mishra, N. S.; Ranganathan, S.

doi:10.1016/0956-7151(94)00417-x

Cited by 18 publications

(3 citation statements)

References 44 publications

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“…4). Short-range order has also been reported in Ni-10% W and Ni-15% W alloys in the rapidly quenched state [21,22]. The decrease in SFE, increased strength coupled with possible short range ordering is believed to be responsible for the observed texture transition in Ni-W alloys at W > 5 at.%.…”

Section: Discussionmentioning

confidence: 86%

On the cold rolling textures in some fcc Ni–W alloys

Sarma

Eickemeyer

Mickel

et al. 2004

Materials Science and Engineering: A

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Section: Discussionmentioning

confidence: 86%

On the cold rolling textures in some fcc Ni–W alloys

Sarma

Eickemeyer

Mickel

et al. 2004

Materials Science and Engineering: A

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“…In the Ni-W binary phase diagrams, there are stable intermetallic compounds of Ni 4 W and Ni 2 W present, and the stable structure of Ni 3 W is D0 22 . [51] Here, we provide a stability analysis of ternary and quaternary systems with L1 2 crystal structures, and do not do so for NiCo solution and binary systems. Three methods were adopted to measure the structural stability, i.e., the Born stability criteria, [52] formation energy, and pseudogap.…”

Section: Stabilitymentioning

confidence: 99%

Composition effect on elastic properties of model NiCo-based superalloys*

Wang

2020

Chinese Phys. B

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NiCo-based superalloys exhibit higher strength and creep resistance over conventional superalloys. Compositional effects on elastic properties of the γ and γ′ phases in newly-developed NiCo-based superalloys were investigated by first-principles calculation combined with special quasi-random structures. The lattice constant, bulk modulus, and elastic constants vary linearly with the Co concentration in the NiCo solution. In the selected (Ni, Co)3(Al, W) and (Ni, Co)3(Al, Ti) model γ′ phase, the lattice constant, and bulk modulus show a linear trend with alloying element concentrations. The addition of Co, Ti, and W can regulate lattice mismatch and increase the bulk modulus, simultaneously. W-addition shows excellent performance in strengthening the elastic properties in the γ′ phase. Systems become unstable with higher W and Ni contents, e.g., (Ni0.75Co0.25)3(Al0.25 W0.75), and become brittle with higher W and Co addition, e.g., Co3(Al0.25 W0.75). Furthermore, Co, Ti, and W can increase the elastic constants on the whole, and such high elastic constants always correspond to a high elastic modulus. The anisotropy index always corresponds to the nature of Young’s modulus in a specific direction.

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“…The accepted W-Ni phase diagram shows three intermetallic phases: Ni 4 W, Ni 2 W, and NiW [36]. Several studies sought to confirm all three phases but instead report the only intermetallic formed as Ni 4 W, from quenching a variety of compositions [37], arc-melting [38], and electrodeposition [39]. Another arc-melting study of W and Ni pellets annealed at 950 °C for 32 days demonstrated again the formation of Ni 4 W and Ni(W) or W(Ni), leading to the proposal that carbon contamination in previous studies resulted in W 6 Ni 6 C being identified as NiW and W 4 Ni 2 C as NiW 2 [40].…”

Section: X-ray Diffractionmentioning

confidence: 99%

Characterization of tungsten–nickel simultaneous Ohmic contacts to p- and n-type 4H-SiC

Kragh-Buetow¹,

Okojie²,

Lukco³

et al. 2015

Semicond. Sci. Technol.

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Ohmic contacts to p-and n-type 4H-SiC using refractory alloyed W:Ni thin films were investigated. Transfer length measurement test structures to p-type 4H-SiC (N A =3×10 20 cm −3 ) revealed Ohmic contacts with specific contact resistances, ρ c , of ∼10 −5 Ω cm 2 after 0.5 h annealing in argon at temperatures of 1000 °C, 1100 °C, 1150 °C, and 1200 °C. Contacts fabricated on n-type 4H-SiC (N D =2×10 19 cm −3 ) by similar methods were shown to have similar specific contact resistance values after annealing, demonstrating simultaneous Ohmic contact formation for W:Ni alloys on 4H-SiC. The lowest ρ c values were (7.3±0.9)×10 −6 Ω cm 2 for p-SiC and (6.8±3.1)×10 −6 Ω cm 2 for n-SiC after annealing at 1150 °C. X-ray diffraction shows a cubic tungsten-nickel-carbide phase in the Ohmic contacts after annealing as well as WC after higher temperatures. Auger electron spectroscopy depth profiles support the presence of metal carbide regions above a nickel and silicon-rich region near the interface. X-ray energy dispersive spectroscopy mapping showed tungsten-rich and nickelrich regions after annealing at 1100 °C and above. W:Ni alloys show promise as simultaneous Ohmic contacts to p-and n-SiC, offering low and comparable ρ c values along with the formation of W x Ni y C.

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Electron microscopy and diffraction of ordering in NiW alloys

Cited by 18 publications

References 44 publications

On the cold rolling textures in some fcc Ni–W alloys

On the cold rolling textures in some fcc Ni–W alloys

Composition effect on elastic properties of model NiCo-based superalloys*

Characterization of tungsten–nickel simultaneous Ohmic contacts to p- and n-type 4H-SiC

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