Trajectory overlaps and local magnification in three-dimensional atom probe

Vurpillot, F.; Bostel, A.; Blavette, D.

doi:10.1063/1.126545

Cited by 409 publications

(280 citation statements)

References 12 publications

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“…It is well known that APT 3D reconstructed volumes can be affected by local magnification effects if different phases with different evaporation fields are evaporated simultaneously [33]. The predicted evaporation fields for chromium (Cr + , 27 V.nm -1 ) and copper (Cu + 30V.nm -1 ) are slightly different [34].…”

Section: Methodsmentioning

confidence: 99%

Atomic scale investigation of Cr precipitation in copper

2012

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The early stage of the chromium precipitation in copper was analyzed at the atomic scale by Atom Probe Tomography (APT). Quantitative data about the precipitate size, 3D shape, density, composition and volume fraction were obtained in a Cu-1Cr-0.1Zr (wt.%) commercial alloy aged at 713K. Surprisingly, nanoscaled precipitates exhibit various shapes (spherical, plates and ellipsoid) and contain a large amount of Cu (up to 50%), in contradiction with the equilibrium Cu-Cr phase diagram. APT data also show that some impurities (Fe) may segregate along Cu/Cr interfaces. The concomitant evolution of the precipitate shape and composition as a function of the aging time is discussed. A special emphasis is given on the competition between interfacial and elastic energy and on the role of Fe segregation.

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Section: Methodsmentioning

confidence: 99%

Atomic scale investigation of Cr precipitation in copper

2012

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“…We now comment on interface sharpness as determined by HREM and 3DAP microscopies. For a 3DAP microscope analysis direction parallel to the interface plane, there exists the possibility of field-evaporation trajectory effects [19] because each phase field-evaporates at slightly different values of the local electric field. Therefore, when two phases field-evaporate simultaneously, their different fieldevaporation characteristics must be taken into account when interpreting the 3D reconstruction [20].…”

Section: Chemical Analysis: Three-dimensional Atom-probe Microscope Imentioning

confidence: 99%

Atomic Scale Chemistry of α₂/ Interfaces in a Multi-Component TiAl Alloy

2004

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Abstract. We report on the distribution of micro-alloying elements in a multi-component TiAl-based alloy. The specimen contains 3 at.% Nb, 1.5 at.% Cr, 0.5 at.% Mn, 0.6 at.% (W + Hf + Zr), and 0.2 at.% each of B, C, and O. The distributions of all micro-alloying elements with respect to the heterophase interface between α 2 and γ lamellae are analyzed with a three-dimensional atom-probe (3DAP) microscope. All the elements partition except boron, which resides primarily in boride precipitates. Oxygen, C, Mn, and Cr partition to the α 2 -phase, whereas Nb and Zr partition to the γ -phase. Both W and Hf exhibit excess concentration values within ca. 7 nm of the lamellar interface in the α 2 -phase, and their near interfacial excesses are 0.26 and 0.35 atoms nm -2 , respectively.

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“…The latter technique involves the atom-by-atom field evaporation of a material by an applied voltage, in order to provide a timeof-flight mass spectrum and the position of each atom in the tip. 9,10 Although the influence of the shape, crystallography and chemical composition of an APT needle on ion trajectories 11 can be simulated numerically 12 and models of the dielectric properties of embedded nanoparticles can be fitted to experimental measurements, 13 the development of a technique that can be used to measure the electric field around such a needle, or equivalently the charge distribution within it, promises to provide a more direct method for minimising artefacts in the reconstructed volume. 10 Off-axis electron holography provides direct access to the phase shift …”

Section: Introductionmentioning

confidence: 99%

Model-independent measurement of the charge density distribution along an Fe atom probe needle using off-axis electron holography without mean inner potential effects

Migunov

London

Farle

et al. 2015

Journal of Applied Physics

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Towards quantitative off-axis electron holographic mapping of the electric field around the tip of a sharp biased metallic needle J. Appl. Phys. 116, 024305 (2014) Model-independent measurement of the charge density distribution along an Fe atom probe needle using off-axis electron holography without mean inner potential effects The one-dimensional charge density distribution along an electrically biased Fe atom probe needle is measured using a model-independent approach based on off-axis electron holography in the transmission electron microscope. Both the mean inner potential and the magnetic contribution to the phase shift are subtracted by taking differences between electron-optical phase images recorded with different voltages applied to the needle. The measured one-dimensional charge density distribution along the needle is compared with a similar result obtained using model-based fitting of the phase shift surrounding the needle. On the assumption of cylindrical symmetry, it is then used to infer the three-dimensional electric field and electrostatic potential around the needle with $10 nm spatial resolution, without needing to consider either the influence of the perturbed reference wave or the extension of the projected potential outside the field of view of the electron hologram. The present study illustrates how a model-independent approach can be used to measure local variations in charge density in a material using electron holography in the presence of additional contributions to the phase, such as those arising from changes in mean inner potential and specimen thickness.

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Trajectory overlaps and local magnification in three-dimensional atom probe

Cited by 409 publications

References 12 publications

Atomic scale investigation of Cr precipitation in copper

Atomic scale investigation of Cr precipitation in copper

Atomic Scale Chemistry of α₂/ Interfaces in a Multi-Component TiAl Alloy

Model-independent measurement of the charge density distribution along an Fe atom probe needle using off-axis electron holography without mean inner potential effects

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Trajectory overlaps and local magnification in three-dimensional atom probe

Cited by 409 publications

References 12 publications

Atomic scale investigation of Cr precipitation in copper

Atomic scale investigation of Cr precipitation in copper

Atomic Scale Chemistry of α2/ Interfaces in a Multi-Component TiAl Alloy

Model-independent measurement of the charge density distribution along an Fe atom probe needle using off-axis electron holography without mean inner potential effects

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Atomic Scale Chemistry of α₂/ Interfaces in a Multi-Component TiAl Alloy