An accidental visualization of the Brillouin zone in an Ni–W alloy<i>via</i>diffuse scattering

Maisel, Sascha; Schindzielorz, Nils; Müller, Stefan; Reichert, H.; Bosak, Alexeï

doi:10.1107/s0021889813016270

Cited by 10 publications

(5 citation statements)

References 27 publications

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“…While a random alloy would exhibit roughly constant intensities across the entire Brillouin zone, the scattering pattern in Ni-Re features distinct contours. The overall shape is not unlike the ones found in Ni-W [35] or Ni-Mo single crystals [36][37][38]. From the relative amplitudes of the in the diffractions patterns in Figs.…”

Section: Thermodynamic Behavior At Elevated Temperaturesmentioning

confidence: 80%

Nickel-rhenium compound sheds light on the potency of rhenium as a strengthener in high-temperature nickel alloys

et al. 2014

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For many decades, it has been known that rhenium imparts a tremendous resistance to creep to the nickel-based high-temperature alloys colloquially known as superalloys. This effect is so pronounced that is has been dubbed "the rhenium effect." Its origins are ill-understood, even though it is so critical to the performance of these high-temperature alloys. In this paper we show that the currently known phase diagram is inaccurate, and neglects a stoichiometric compound at 20 at.% Re (Ni 4 Re). The presence of this precipitate at low temperatures and the short-range ordering of Re in fcc-Ni observed at higher temperatures have important ramifications for the Ni-based superalloys. The Ni 4 Re compound is shown to be stable by quantum mechanical high-throughput calculations at 0 K. Monte Carlo simulations show that it is thermally persistent up to ≈930 K when considering configurational entropy. The existence of this compound is investigated using extended x-ray absorption fine spectroscopy on a Ni 96.62 Re 3.38 alloy.

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Section: Thermodynamic Behavior At Elevated Temperaturesmentioning

confidence: 80%

Nickel-rhenium compound sheds light on the potency of rhenium as a strengthener in high-temperature nickel alloys

et al. 2014

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“…They had a very large unit cell in comparison to Ni-based matrix and the composition was *12 at.% W, which is very near to 11.1 at.% W (Ni 8 W). Maisel et al [37] made X-ray diffuse scattering measurements on a Ni-W single crystal with 8 % W, and they showed {2/300} reflections, which suggest the presence of Pt 8 Ti-type Ni 8 W.…”

Section: Phase Diagram and Activity Datamentioning

confidence: 99%

First principles, thermal stability and thermodynamic assessment of the binary Ni–W system

Isomäki

Hämäläinen

Braga

et al. 2017

International Journal of Materials Research

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First principles, thermal stability and thermodynamic assessment of the binary Ni-W systemThe Ni-W binary system was assessed using critically evaluated experimental data with assistance from first principles analysis and the CALPHAD method. The solution phases (liquid, fcc-A1 and bcc-A2) were modeled using the substitutional regular solution model. The recently discovered Ni 8 W metastable phase was evaluated as Fe 16 C 2 -like martensite with three sublattices, and shown to be possibly stable according to first principles calculations. Ni 8 W was also modeled as an interstitial compound, but the model is not good because the solubility of tungsten in nickel is very low, especially at low temperatures. There is no experimental evidence for such low solubility. The other binary compounds Ni 4 W and Ni 3 W were assessed as stoichiometric ones. Compared independent experimental and first principles data agree well with the calculated phase diagram using updated thermodynamic parameters.

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“…INTRODUCTION In recent years, Ni-rich Ni-W alloys containing 0-10 at. % W have attracted substantial interest due to their peculiar electronic structure 1 and their importance in the field of Ni-based superalloys (If not mentioned otherwise, it is implicitly understood that all concentrations are given in atomic percent for the remainder of this work. ): Since the face-centered cubic (f.c.c.)…”

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Discovery of a thermally persistent h.c.p. solid-solution phase in the Ni-W system

Kurz

Maisel

Leineweber

et al. 2014

Journal of Applied Physics

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Although the accepted Ni-W phase diagram does not reveal the existence of h.c.p.-based phases, h.c.p.-like stacking sequences were observed in magnetron-co-sputtered Ni-W thin films at W contents of 20 to 25 at. %, by using transmission electron microscopy and X-ray diffraction. The occurrence of this h.c.p.-like solid-solution phase could be rationalized by first-principles calculations, showing that the vicinity of the system's ground-state line is populated with metastable h.c.p.-based superstructures in the intermediate concentration range from 20 to 50 at. % W. The h.c.p.-like stacking in Ni-W films was observed to be thermally persistent, up to temperatures as high as at least 850 K, as evidenced by extensive X-ray diffraction analyses on specimens before and after annealing treatments. The tendency of Ni-W for excessive planar faulting is discussed in the light of these new findings.

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An accidental visualization of the Brillouin zone in an Ni–W alloyviadiffuse scattering

Cited by 10 publications

References 27 publications

Nickel-rhenium compound sheds light on the potency of rhenium as a strengthener in high-temperature nickel alloys

Nickel-rhenium compound sheds light on the potency of rhenium as a strengthener in high-temperature nickel alloys

First principles, thermal stability and thermodynamic assessment of the binary Ni–W system

Discovery of a thermally persistent h.c.p. solid-solution phase in the Ni-W system

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