An atom probe investigation of the role of rhenium additions in improving creep resistance of Ni-base superalloys

Blavette, D.; Caron, Pierre; Khan, T.

doi:10.1016/0036-9748(86)90103-1

Cited by 154 publications

(72 citation statements)

References 4 publications

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“…Nowadays, up to (and beyond) 100 million atoms can be collected from a given sample. This contrasts strongly with the situation for the original 1D atom probes used by Blavette [3], for which datasets of a few 1, 000s of atoms were expected.…”

Section: Introductioncontrasting

confidence: 74%

“…These studies began in the 1980s when Blavette et al [3] used the one-dimensional (1D) atom probe to find some evidence of small (1.3 nm diameter) rhenium particles, by examination of ladder diagrams. Since this seminal work, rhenium clustering in these materials has been invoked as a possible explanation for the rhenium-effect.…”

Section: Introductionmentioning

confidence: 99%

“…The analyses of Blavette [3] and Wanderka [4], reproduced in Figure 1, relied upon ladder diagrams obtained from 1DAP data. Ladder diagrams show the count of each species present in the sample over the total number of atoms collected.…”

Section: Introductionmentioning

confidence: 99%

“…its atomic fraction). Variations in the slope correspond to perturbations in the distribution of rhenium atoms in the host lattice: these perturbations were suggested to be an indication of rhenium clustering in the alloy [3]. This type of analysis, however, needs to be applied to datasets which do not show compositional variations due to microstructural features.…”

Section: Introductionmentioning

confidence: 99%

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Atom Probe Tomography Analysis of Possible Rhenium Clustering in Nickel-Based Superalloys

Mottura¹,

Miller²,

Reed³

2008

Superalloys 2008 (Eleventh International Symposium)

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A local electrode atom probe is used to characterise a number of binary and commercial nickel-based alloys, specifically to determine whether rhenium atoms form solute clusters in these materials. The data are analysed via a statistical approach and results are compared to simulations which take the typical efficiency of the atom probe and the scatter in atomic positions into account. Thus, even the smallest clusters can -in principle -be detected by the algorithm. The analysis demonstrates conclusively that rhenium is not prone to clustering in the nickel lattice above the level associated with the random distribution of Re atoms. A similar conclusion applies to the other 5d elements (Ta, W, Ir and Pt) analysed in this study.

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Section: Introductioncontrasting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Atom Probe Tomography Analysis of Possible Rhenium Clustering in Nickel-Based Superalloys

Mottura¹,

Miller²,

Reed³

2008

Superalloys 2008 (Eleventh International Symposium)

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“…However, there is currently no detailed understanding of the atomic-scale mechanisms underlying these processes. The hypothesis of Rhenium clustering, originally proposed in pioneering atom probe experiments [4,5], has been dismissed after more refined experiments (three-dimensional atom probe technique [6,7] and extended x-ray absorption fine spectroscopy [8,9]) and theoretical atomistic investigation [10]. Slow-diffusing atoms in the matrix were thought to hinder dislocation climb processes at the interface [11].…”

Section: Introductionmentioning

confidence: 99%

Modelling defects in Ni–Al with EAM and DFT calculations

Bianchini

Kermode

Vita

2016

Modelling Simul. Mater. Sci. Eng.

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We present detailed comparisons between the results of embedded atom model (EAM) and density functional theory (DFT) calculations on defected Ni alloy systems. We find that the EAM interatomic potentials reproduce low-temperature structural properties in both the γ and γ′ phases, and yield accurate atomic forces in bulk-like configurations even at temperatures as high as ∼1200 K. However, they fail to describe more complex chemical bonding, in configurations including defects such as vacancies or dislocations, for which we observe significant deviations between the EAM and DFT forces, suggesting that derived properties such as (free) energy barriers to vacancy migration and dislocation glide may also be inaccurate. Testing against full DFT calculations further reveals that these deviations have a local character, and are typically severe only up to the first or second neighbours of the defect. This suggests that a QM/MM approach can be used to accurately reproduce QM observables, fully exploiting the EAM potential efficiency in the MM zone. This approach could be easily extended to ternary systems for which developing a reliable and fully transferable EAM parameterisation would be extremely challenging e.g. Ni alloy model systems with a W or Re-containing QM zone.

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On the Thermodynamics and Kinetics of TCP Phase Precipitation in Re‐ and Ru‐ Containing Ni‐base Superalloys

et al. 2015

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Three experimental Ni-base superalloys of the second, third and fourth generation are studied in this work to clarify the effect of Re and Ru on the precipitation of TCP phases. Thermodynamic calculations using the CALPHAD method are performed based on the local chemical composition obtained with the use of electron probe microanalysis. The effects of microsegregation and g 0 -precipitation are taken into account. The results, complemented with scanning electron microscopy observations, show that Re increases, while Ru decreases the inclination of the material to precipitate TCP phases. The effect of both elements is assigned to thermodynamic rather than kinetic reasons. The CALPHAD-calculations do predict the effect of Re on the TCP phase formation in the investigated alloys correctly, but not the effect of Ru.

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An atom probe investigation of the role of rhenium additions in improving creep resistance of Ni-base superalloys

Cited by 154 publications

References 4 publications

Atom Probe Tomography Analysis of Possible Rhenium Clustering in Nickel-Based Superalloys

Atom Probe Tomography Analysis of Possible Rhenium Clustering in Nickel-Based Superalloys

Modelling defects in Ni–Al with EAM and DFT calculations

On the Thermodynamics and Kinetics of TCP Phase Precipitation in Re‐ and Ru‐ Containing Ni‐base Superalloys

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