Interface analysis with the three‐dimensional atom probe

Miller, M.K.

doi:10.1002/sia.1086

Cited by 19 publications

(8 citation statements)

References 27 publications

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“…The generated proxigrams (i.e. proximity histograms) [41][42] for different γ and γ' interfaces confirm that W has a very strong tendency to partition to the γ' phase, unlike Al, in agreement with the phase diagram. The sum of Al and W contents in the γ' phase is close to 25 at.…”

Section: Temporal Evolution Of Phase Compositionsupporting

confidence: 67%

Kinetics pathway of precipitation in model Co-Al-W superalloy

et al. 2018

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Abstract:The early stages of precipitation of the γ ' phase in a model Co based superalloy (Co-9.1Al-7W (at.%)) have been investigated at 900 °C using electron microscopy and atom probe tomography. Nucleation, growth and coarsening stages have been studied with a focus on the temporal evolution of the precipitate composition in the light of recent theoretical developments on phase separation in multicomponent alloys. The experimental data have been confronted to the theories of nucleation and coarsening recently developed for such alloys, which are valid for non-ideal and non-dilute systems, and predict the temporal evolution of both the matrix and precipitate compositions. The rate constant for the mean size evolution of the particles, as derived from experiments, has been compared to the one predicted by the mentioned coarsening theory that accounts for a more accurate description of the thermodynamics of the phases, as compared with more classical approaches. From this comparison the γ/γ' interfacial energy was derived and found equal to ~48 mJ/m 2 . the exponents for the temporal evolution of average particles size, number of particles per unit volume were found identical to those for binary alloys during the coarsening regime, as expected, and the temporal evolutions of compositions in both γ and γ' phases were found to evolve as predicted by theory. Indeed, the W content in the particles, measured from atom probe tomography (APT) experiments, was found to significantly decrease with time and the observed evolution is remarkably well described by the theory and therefore is shown to originate from the competition between diffusion and capillarity.

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Section: Temporal Evolution Of Phase Compositionsupporting

confidence: 67%

Kinetics pathway of precipitation in model Co-Al-W superalloy

et al. 2018

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“…The transformations are accompanied via partition of different alloying elements, as investigated using atom probe tomography (APT).The APT results from edge and center regions of the laser track show clear segregation of B and Si to these distinct regions within the reconstructed volume (Figures 6 and 7). A suitable isoconcentration (isosurface) is choosen in such a way that it delineated both the phases, and then a proximity histogram is generated across the interface to determine partitioning of the elements into the respective phases 27,28. The 80 at.…”

mentioning

confidence: 99%

Laser assisted crystallization of ferromagnetic amorphous ribbons: A multimodal characterization and thermal model study

Katakam

Devaraj

Bowden

et al. 2013

Journal of Applied Physics

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“…that is kept at a standing voltage while a local electrode is given a pulsed voltage. The sample is traditionally prepared into a sharp needle shape with a tip radius on the order of 100 nm by electropolishing a wire sample or using a focused ion beam to mill a tip~Larson et al, 2001;Zhou et al, 2001;Thompson et al, 2004;Miller et al, 2005!. The standing voltage on the sample is kept close to the voltage needed for field evaporation, and the pulsed voltage on the local electrode is used to increase the field just enough to allow one atom to field evaporate.…”

Section: Atom Probe Tomographymentioning

confidence: 99%

Atom Scale Characterization of the Near Apex Region of an Atomic Force Microscope Tip

Tourek

Sundararajan

2010

Microsc Microanal

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Three-dimensional atom probe tomography (APT) is successfully used to analyze the near-apex regions of an atomic force microscope (AFM) tip. Atom scale material structure and chemistry from APT analysis for standard silicon AFM tips and silicon AFM tips coated with a thin film of Cu is presented. Comparison of the thin film data with that observed using transmission electron microscopy indicates that APT can be reliably used to investigate the material structure and chemistry of the apex of an AFM tip at near atomic scales. Abstract: Three-dimensional atom probe tomography~APT! is successfully used to analyze the near-apex regions of an atomic force microscope~AFM! tip. Atom scale material structure and chemistry from APT analysis for standard silicon AFM tips and silicon AFM tips coated with a thin film of Cu is presented.Comparison of the thin film data with that observed using transmission electron microscopy indicates that APT can be reliably used to investigate the material structure and chemistry of the apex of an AFM tip at near atomic scales.

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Interface analysis with the three‐dimensional atom probe

Cited by 19 publications

References 27 publications

Kinetics pathway of precipitation in model Co-Al-W superalloy

Kinetics pathway of precipitation in model Co-Al-W superalloy

Laser assisted crystallization of ferromagnetic amorphous ribbons: A multimodal characterization and thermal model study

Atom Scale Characterization of the Near Apex Region of an Atomic Force Microscope Tip

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