Efficient sampling for three-dimensional atom probe microscopy data

Hellman, Olof C.; Rivage, John Blatz du; Seidman, David N.

doi:10.1016/s0304-3991(02)00317-0

Cited by 155 publications

(100 citation statements)

References 7 publications

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“…In the analysis of data isoconcentration surfaces and proximity histograms were derived for a voxel of 2 3 nm 3 and a delocalization of 4 nm using CAMECA's IVAS software, which implements methods developed by Hellman et al [35][36][37] Proximity histograms were represented as distance versus carbon at. pct, or the ratio of the number of each elements atoms against the number of iron atoms.…”

Section: Methodsmentioning

confidence: 99%

Tempering of Low-Temperature Bainite

Peet

Babu

Miller

et al. 2017

Metall Mater Trans A

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Electron microscopy, X-ray diffraction, and atom probe tomography have been used to identify the changes which occur during the tempering of a carbide-free bainitic steel transformed at 473 K (200 °C). Partitioning of solute between ferrite and thin-films of retained austenite was observed on tempering at 673 K (400 °C) for 30 minutes. After tempering at 673 K (400 °C) and 773 K (500 °C) for 30 minutes, cementite was observed in the form of nanometre scale precipitates. Proximity histograms showed that the partitioning of solutes other than silicon from the cementite was slight at 673 K (400 °C) and more obvious at 773 K (500 °C). In both cases, the nanometre scale carbides are greatly depleted in silicon.

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Section: Methodsmentioning

confidence: 99%

Tempering of Low-Temperature Bainite

Peet

Babu

Miller

et al. 2017

Metall Mater Trans A

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“…APT data were analyzed with the IVAS ® 3.0 software program (Imago Scientific Instruments, Madison, Wisconsin). The γ'-precipitate/γ-matrix heterophase interfaces were delineated with Al isoconcentration surfaces generated by efficient sampling procedures [20]. Detailed compositional information was obtained with the proximity histogram method [21], and extrapolated to infinite time employing the predictions of classical coarsening models [22].…”

Section: Methodsmentioning

confidence: 99%

Effects of a Tantalum Addition on the Morphological and Compositional Evolution of a Model Ni-Al-Cr Superalloy

Booth-Morrison

Noebe

Seidman

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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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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“…1, the absence of large density fluctuations between the reconstructed phases demonstrates that the field-evaporation behavior of the two phases is similar. The c/c 0 interfaces are delineated with 9 at.% Al isoconcentration surfaces (approximately the mid-point value between bulk compositions of c and c 0 ) calculated with efficient sampling procedures [31] and parameters [25] that optimize the statistical noise and reduce positional errors. Employing this isoconcentration surface procedure, c 0 -precipitates with radii (determined from the volume-equivalent radius of the best-fit ellipsoid [25]) as small as 0.45 nm (20 detected atoms) are resolved.…”

Section: Methodsmentioning

confidence: 99%

Temporal evolution of the nanostructure and phase compositions in a model Ni–Al–Cr alloy

et al. 2006

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In a Ni-5.2 Al-14.2 Cr at.% alloy with moderate solute supersaturations and a very small c/c 0 lattice parameter misfit, the nanostructural and compositional pathways during c 0 (L1 2 ) precipitation at 873 K are investigated using atom-probe tomography, conventional transmission electron microscopy, and hardness measurements. Nucleation of high number densities (N v > 10 23 m À3 ) of solute-rich precipitates (mean radius = AERae = 0.75 nm), with a critical nucleus composition of Ni-18.3 ± 0.9 Al-9.3 ± 0.7 Cr at.%, initiates between 0.0833 and 0.167 h. With increasing aging time (a) the solute concentrations decay in spheroidal precipitates (AERae < 10 nm); (b) the observed early-stage coalescence peaks at maximum N v in coincidence with the smallest interprecipitate spacing; and (c) the reaction enters a quasi-stationary regime where growth and coarsening operate concomitantly. During this quasi-stationary regime, the c (face-centered cubic)-matrix solute supersaturations decay with a power-law dependence of about À1/3, while the dependencies of AERae and N v are 0.29 ± 0.05 and À0.64 ± 0.06 at a coarsening rate slower than model predications. Coarsening models allow both equilibrium phase compositions to be determined from the compositional measurements. The observed early-stage coalescence is discussed in further detail.

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Efficient sampling for three-dimensional atom probe microscopy data

Cited by 155 publications

References 7 publications

Tempering of Low-Temperature Bainite

Tempering of Low-Temperature Bainite

Effects of a Tantalum Addition on the Morphological and Compositional Evolution of a Model Ni-Al-Cr Superalloy

Temporal evolution of the nanostructure and phase compositions in a model Ni–Al–Cr alloy

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