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Booth-Morrison, Christopher; Weninger, Jessica; Sudbrack, Chantal K.; Mao, Zugang; Noebe, Ronald D.; Seidman, David N. |
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Effects of solute concentrations on kinetic pathways in Ni-Al-Cr alloys |
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Journal Article |
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2008 |
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Abstract |
Acta Materialia |
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56 |
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14 |
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3422-3438 |
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Atom-probe tomography; Nanostructures; Nickel-based superalloys; Temporal evolution |
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Abbreviated Series Title |
The kinetic pathways resulting from the formation of coherent γ'-precipitates from the γ-matrix are studied for two Ni-Al-Cr alloys with similar γ'-precipitate volume fractions at 873 K. The details of the phase decompositions of Ni-7.5Al-8.5Cr at.% and Ni-5.2Al-14.2Cr at.% for aging times from 1/6 to 1024 h are investigated by atom-probe tomography, and are found to differ significantly from a mean-field description of coarsening. The morphologies of the γ'-precipitates of the alloys are similar, though the degrees of γ'-precipitate coagulation and coalescence differ. Quantification within the framework of classical nucleation theory reveals that differences in the chemical driving forces for phase decomposition result in differences in the nucleation behavior of the two alloys. The temporal evolution of the γ'-precipitate average radii and the γ-matrix supersaturations follow the predictions of classical coarsening models. The compositional trajectories of the γ-matrix phases of the alloys are found to follow approximately the equilibrium tie-lines, while the trajectories of the γ'-precipitates do not, resulting in significant differences in the partitioning ratios of the solute elements. |
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NU @ karnesky @ |
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9627 |
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Zhou, Yang; Booth-Morrison, Christopher; Seidman, David N. |
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On the field-evaporation behavior of a model Ni-Al-Cr superalloy studied by picosecond pulsed-laser atom probe tomography |
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Journal Article |
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2008 |
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Microscopy and Microanalysis |
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06 |
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571-580 |
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The effects of varying the laser pulse-energy of a picosecond laser used in pulsed-laser atom- probe (PLAP) tomography of an as-quenched Ni-6.24 Al- 9.64 Cr at.% are assessed based on the quality of the mass spectra and the compositional accuracy of the technique. PLAP tomography improves mass resolution, increases the signal-to-noise (S/N) ratio, and improves compositional accuracy, compared to pulsed-voltage atom-probe tomography (APT). Experimental evidence suggests that Ni2+, Al2+ and Cr2+ ions are formed by post-ionization of singly charged ions, as well as by a thermally-activated evaporation process. An analysis of the detected noise levels reveals that there is no significant steady-state heating of the Ni-6.24 Al- 9.64 Cr at.% tips during PLAP tomography for properly chosen instrument parameters. |
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NU @ m-krug @ |
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10216 |
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Booth-Morrison, Christopher; Mao, Zugang; Noebe, Ronald D.; Seidman, David N. |
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Chromium and tantalum site substitution patterns in Ni3Al (L1[sub:2]) [gamma]’-precipitates |
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Journal Article |
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2008 |
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Applied Physics Letters |
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App. Phys. Let. |
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93 |
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033103 |
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Nickel-based superalloys; Site substitution; Atom-probe tomography; Tantalum; Nanostructures, First-principles calculations |
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The site substitution behavior of Cr and Ta in the Ni3Al (L12)-type gamma[prime]-precipitates of a Ni–Al–Cr–Ta alloy is investigated by atom-probe tomography (APT) and first-principles calculations. Measurements of the gamma[prime]-phase composition by APT suggest that Al, Cr, and Ta share the Al sublattice sites of the gamma[prime]-precipitates. The calculated substitutional energies of the solute atoms at the Ni and Al sublattice sites indicate that Ta has a strong preference for the Al sites, while Cr has a weak Al site preference. Furthermore, Ta is shown to replace Cr at the Al sublattice sites of the gamma[prime]-precipitates, altering the elemental phase partitioning behavior of the Ni–Al–Cr–Ta alloy. |
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NU @ m-krug @ ; NU @ c-booth @ |
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10296 |
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Booth-Morrison, Christopher; Noebe, Ronald D.; Seidman, David N. |
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Effects of a tantalum addition on the morphological and compositional evolution of a model Ni-Al-Cr superalloy |
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Journal Article |
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2008 |
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Proceedings of the 11th International Symposium on Superalloys |
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Proceedings of the 11th International Symposium on Su |
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73-79 |
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The effects of a 2.0 at.% addition of Ta to a model Ni-Al-Cr
superalloy aged at 1073 K are assessed using scanning electron
microscopy and atom-probe tomography. The addition of Ta
results in appreciable strengthening, and the morphology is found
to evolve from a bimodal distribution of spheroidal precipitates, to cuboidal precipitates aligned along the elastically soft <001>-type directions. Tantalum is observed to partition preferentially to the γ’-precipitate phase and decreases the mobility of Ni in the γ-matrix sufficiently to cause an accumulation of Ni on the γ-matrix side of the γ’-precipitate/γ-matrix heterophase interface. |
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The Minerals, Metals and Materials Society (TMS) |
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Warrendale, PA |
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Reed, R.C.; Green, K.A.; Caron, P.; Gabb, T.P.; Fahrmann, M.G.; Huron, E.S.; Woodard, S.A. |
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NU @ c-booth @ |
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10481 |
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Zhou, Yang; Mao, Zugang; Booth-Morrison, Christopher; Seidman, David N. |
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The partitioning and site preference of rhenium or ruthenium in model nickel-based superalloys: An atom-probe tomographic and first-principles study |
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Journal Article |
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2008 |
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Applied Physics Letters |
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93 |
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171905 |
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The partitioning behavior and sublattice site preference of Re or Ru in the Ni3Al (L12) gamma[prime]- precipitates of model Ni-Al-Cr alloys are investigated by atom-probe tomography (APT) and first-principles calculations. Rhenium and Ru are experimentally observed to partition to the gamma(fcc)-phase, which is consistent with the smaller values of the gamma-matrix Re and Ru substitutional formation energies determined by first-principles calculations. APT measurements of the gamma[prime]-precipitate composition indicate that Re and Ru occupy the Al sublattice sites of the Ni3Al (L12) phase. The preferential site substitution of Re and Ru at Al sublattice sites is confirmed by first-principles calculations |
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NU @ c-booth @ |
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10532 |
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Booth-Morrison, Christopher; Noebe, Ronald D.; Seidman, David N. |
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Effects of tantalum on the temporal evolution of a model Ni-Al-Cr superalloy during phase decomposition |
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Journal Article |
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2009 |
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Acta Materialia |
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Acta Mater. |
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57 |
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3 |
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909-920 |
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Nickel-based superalloys; Tantalum; Atom-probe tomography; Nanostructures |
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The effects of a 2.0 at.% addition of Ta to a model Ni–10.0Al–8.5Cr (at.%) superalloy aged at 1073 K are assessed using scanning electron microscopy and atom-probe tomography. The γ′(L12)-precipitate morphology that develops as a result of γ-(fcc)matrix phase decomposition is found to evolve from a bimodal distribution of spheroidal precipitates, to {0 0 1}-faceted cuboids and parallelepipeds aligned along the elastically soft left angle bracket0 0 1right-pointing angle bracket-type directions. The phase compositions and the widths of the γ′-precipitate/γ-matrix heterophase interfaces evolve temporally as the Ni–Al–Cr–Ta alloy undergoes quasi-stationary state coarsening after 1 h of aging. Tantalum is observed to partition preferentially to the γ′-precipitate phase, and suppresses the mobility of Ni in the γ-matrix sufficiently to cause an accumulation of Ni on the γ-matrix side of the γ′/γ interface. Additionally, computational modeling, employing Thermo-Calc, Dictra and PrecipiCalc, is employed to elucidate the kinetic pathways that lead to phase decomposition in this concentrated Ni–Al–Cr–Ta alloy. |
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NU @ c-booth @ |
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10537 |
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Amouyal, Yaron; Mao, Zugang; Booth-Morrison, Christopher; Seidman, David N. |
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On the interplay between tungsten and tantalum atoms in Ni-based superalloys: An atom-probe tomographic and first-principles study |
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Journal Article |
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2009 |
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Applied Physics Letters |
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Appl. Phys. Lett. |
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94 |
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041917 |
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NU @ c-booth @ |
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10551 |
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Booth-Morrison, Christopher; Zhou, Yang; Noebe, Ronald D.; Seidman, David N. |
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On the nanometer scale phase decompositon of a low-supersaturation Ni-Al-Cr alloy |
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Journal Article |
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2010 |
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Philosophical Magazine |
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90 |
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1-4 |
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219-235 |
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nickel-based superalloy; phase decomposition; atom probe tomography; temporal evolution; nanostructure |
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The phase separation of a Ni–6.5 Al–9.5 Cr at. % alloy aged at 873K was studied by atom-probe tomography and compared to the predictions of classical precipitation models. Phase separation in this alloy occurs in four distinct regimes: (i) quasi-stationary-state [gamma]'(L12)-precipitate nucleation; (ii) concomitant precipitate nucleation, growth and coagulation and coalescence; (iii) concurrent growth and coarsening, wherein coarsening occurs via both [gamma]'-precipitate coagulation and coalescence and by the classical evaporation–condensation mechanism; and (iv) quasi-stationary state coarsening of [gamma]'-precipitates, once the equilibrium volume fraction of precipitates is achieved. The predictions of classical nucleation and growth models are not validated experimentally, likely due to the complexity of the atomistic kinetic pathways involved in precipitation. During coarsening, the temporal evolution of the [gamma']-precipitate average radius, number density and the [gamma] (fcc)-matrix and [gamma]'-precipitate supersaturations follow the predictions of classical models. |
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NU @ c-booth @ |
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10575 |
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Booth-Morrison, Christopher |
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Nanoscale Studies of the Early Stages of Phase Separation in Model Ni-Al-Cr Superalloys |
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Journal Article |
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2009 |
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Ph.D. Thesis |
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196 |
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Ph.D. thesis |
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NU @ c-booth @ |
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10592 |
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Booth-Morrison, Christopher; Zhou, Yang; Noebe, Ronald D.; Seidman, David N. |
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On the nanometer scale phase separation of a low-supersaturation Ni–Al–Cr alloy |
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Journal Article |
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2009 |
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Philosophical Magazine |
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Philosophical Magazine |
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90 |
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1-4 |
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219-235 |
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* nickel-based superalloy, * phase decomposition, * atom probe tomography, * temporal evolution, * nanostructure |
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The phase separation of a Ni?6.5 Al?9.5 Cr at. % alloy aged at 873 K was studied by atom-probe tomography and compared to the predictions of classical precipitation models. Phase separation in this alloy occurs in four distinct regimes: (i) quasi-stationary-state ??(L12)-precipitate nucleation; (ii) concomitant precipitate nucleation, growth and coagulation and coalescence; (iii) concurrent growth and coarsening, wherein coarsening occurs via both ??-precipitate coagulation and coalescence and by the classical evaporation?condensation mechanism; and (iv) quasi-stationary-state coarsening of ??-precipitates, once the equilibrium volume fraction of precipitates is achieved. The predictions of classical nucleation and growth models are not validated experimentally, likely due to the complexity of the atomistic kinetic pathways involved in precipitation. During coarsening, the temporal evolution of the ??-precipitate average radius, number density and the ?(fcc)-matrix and ??-precipitate supersaturations follow the predictions of classical models. |
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Taylor & Francis |
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1478-6435 |
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doi: 10.1080/14786430902806660 |
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NU @ karnesky @ |
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11158 |
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