A model accounting for spatial overlaps in 3D atom-probe microscopy

Blavette, D.; Vurpillot, F.; Pareige, P.; Menand, A.

doi:10.1016/s0304-3991(01)00120-6

Cited by 104 publications

(88 citation statements)

References 11 publications

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“…As suggested by Gagliano (24) this may be a lower limit of the true Cu concentration value caused by aberrations of ion trajectories and local magnification effects in 3DAP, which limits the spatial resolution of this nanoanalytical technique to a few tenths of a nanometer (29). It is well established now (30,31) that spatial overlap effects due to the difference in the field evaporation between the matrix and the precipitate in the Fe-Cu system leads to matrix atoms being projected into the precipitate, especially for particles smaller than 5 nm in size.…”

Section: Three-dimensional Atom Probe (3dap) Microscopymentioning

confidence: 93%

Prototype evaluation of transformation toughened blast resistant naval hull steels: Part II

Saha

Jung

Olson

2007

J Computer-Aided Mater Des

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Application of a systems approach to computational materials design led to the theoretical design of a transformation toughened ultratough high-strength plate steel for blast-resistant naval hull applications. A first prototype alloy has achieved property goals motivated by projected naval hull applications requiring extreme fracture toughness (C v > 85 ft-lbs or 115 J corresponding to K Id ≥ 200 ksi.in 1/2 or 220 MPa.m 1/2 ) at strength levels of 150-180 ksi (1,030-1,240 MPa) yield strength in weldable, formable plate steels. A continuous casting process was simulated by slab casting the prototype alloy as a 1.75 (4.45 cm) plate. Consistent with predictions, compositional banding in the plate was limited to an amplitude of 6-7.5 wt% Ni and 3.5-5 wt% Cu. Examination of the oxide scale showed no evidence of hot shortness in the alloy during hot working. Isothermal transformation kinetics measurements demonstrated achievement of 50% bainite in 4 min at 360 • C. Hardness and tensile tests confirmed predicted precipitation strengthening behavior in quench and tempered material. Multi-step tempering conditions were employed to achieve the optimal austenite stability resulting in significant increase of impact toughness to 130 ft-lb (176 J) at a strength level of 160 ksi (1,100 MPa). Comparison with the baseline toughness-strength combination determined by isochronal tempering studies indicates a transformation toughening increment of 65% in Charpy energy. Predicted Cu particle number densities and the heterogeneous nucleation of optimal stability high Ni 5 nm austenite on nanometer-scale copper precipitates in the multi-step tempered samples was confirmed using three-dimensional atom probe microanalysis. A. Saha et al. Charpy impact tests and fractography demonstrate ductile fracture with C v > 80 ft-lbs (108 J) down to −40 • C, with a substantial toughness peak at 25 • C consistent with designed transformation toughening behavior. The properties demonstrated in this first prototype represent a substantial advance over existing naval hull steels. Achieving these improvements in a single design and prototyping iteration is a significant advance in computational materials design capability.

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Section: Three-dimensional Atom Probe (3dap) Microscopymentioning

confidence: 93%

Prototype evaluation of transformation toughened blast resistant naval hull steels: Part II

Saha

Jung

Olson

2007

J Computer-Aided Mater Des

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“…This causes areas of differing composition to be "magnified" in the reconstructed data. From the literature [14,15] , it is known that ion trajectory overlaps near the edges of precipitates can lead to incorrect absolute concentration measurements in these regions. However, for the centers of higher-field impurity regions larger than 2 nm this issue is believed to be negligible, and is not expected to significantly affect the atomic-percent-scale compositions reported here except within the outermost 1 nm of the filament where the measured composition is likely too low.…”

Section: Structural Characterizationmentioning

confidence: 99%

Single‐Phase Filamentary Cellular Breakdown Via Laser‐Induced Solute Segregation

Akey

Recht

Williams

et al. 2015

Adv Funct Materials

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Nanosecond melting and quenching of materials offers a pathway to novel structures with unusual properties. Impurity-rich silicon processed using nanosecond-pulsed-laser-melting is known to produce nanoscale features in a process referred to as "cellular breakdown" due to destabilization of the planar liquid/solid interface. Here, we apply atom probe tomography combined with electron microscopy to show that the morphology of cellular breakdown in these materials is significantly more complex than previously documented. We observe breakdown into a complex, branching filamentary structure topped by a few nm of a cell-like layer. Singlephase diamond cubic silicon highly supersaturated with at least 10% atomic Co and no detectable silicides is reported within these filaments. In addition, the unprecedented spatio-chemical accuracy of the atom probe allows us to investigate nanosecond formation dynamics of this 2 complex material. Previously-reported properties of these materials can now be reconsidered in light of their true composition, and this class of inhomogeneous metastable alloys in silicon can be explored with confidence.

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“…This volume contains 6.12 ϫ 10 5 identified atoms, with all atoms displayed. The effect of local magnification aberrations on the measured compositions of nanometer-scale precipitates by 3-D APT has been addressed both experimentally and with modeling~Miller & Hetherington, 1991;Vurpillot et al, 2000Vurpillot et al, , 2004Blavette et al, 2001!. For a one-dimensional atom probe, Miller and Hetherington~1991!…”

Section: Local Magnification Of the Al 3 (Zr 1−x Ti X ) Precipitatesmentioning

confidence: 99%

Atom Probe Tomographic Studies of Precipitation in Al-0.1Zr-0.1Ti (at.%) Alloys

2007

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Atom probe tomography was utilized to measure directly the chemical compositions of Al 3~Z r 1Ϫx Ti x ! precipitates with a metastable L1 2 structure formed in Al-0.1Zr-0.1Ti~at.%! alloys upon aging at 3758C or 4258C. The alloys exhibit an inhomogeneous distribution of Al 3~Z r 1Ϫx Ti x ! precipitates, as a result of a nonuniform dendritic distribution of solute atoms after casting. At these aging temperatures, the Zr:Ti atomic ratio in the precipitates is about 10 and 5, respectively, indicating that Ti remains mainly in solid solution rather than partitioning to the Al 3~Z r 1Ϫx Ti x ! precipitates. This is interpreted as being due to the very small diffusivity of Ti in a-Al, consistent with prior studies on Al-Sc-Ti and Al-Sc-Zr alloys, where the slower diffusing Zr and Ti atoms make up a small fraction of the Al 3~S c 1Ϫx Ti x /Zr x ! precipitates. Unlike those alloys, however, the present Al-Zr-Ti alloys exhibit no interfacial segregation of Ti at the matrix/precipitate heterophase interface, a result that may be affected by a significant disparity in the evaporation fields of the a-Al matrix and Al 3~Z r 1Ϫx Ti x ! precipitates and/or a lack of local thermodynamic equilibrium at the interface.

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A model accounting for spatial overlaps in 3D atom-probe microscopy

Cited by 104 publications

References 11 publications

Prototype evaluation of transformation toughened blast resistant naval hull steels: Part II

Prototype evaluation of transformation toughened blast resistant naval hull steels: Part II

Single‐Phase Filamentary Cellular Breakdown Via Laser‐Induced Solute Segregation

Atom Probe Tomographic Studies of Precipitation in Al-0.1Zr-0.1Ti (at.%) Alloys

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