In-situ observation of non-hemispherical tip shape formation during laser-assisted atom probe tomography

2011 ◽  
Vol 109 (10) ◽  
pp. 104909 ◽  
Author(s):  
S. Koelling ◽  
N. Innocenti ◽  
A. Schulze ◽  
M. Gilbert ◽  
A. K. Kambham ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
In Situ Observation ◽  
Shape Formation

scholarly journals Nanoscale Perspectives of Metal Degradation via In Situ Atom Probe Tomography

2020 ◽  
Vol 63 (15-18) ◽  
pp. 1606-1622 ◽  
Author(s):  
Sten V. Lambeets ◽  
Elizabeth J. Kautz ◽  
Mark G. Wirth ◽  
Graham J. Orren ◽  
Arun Devaraj ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
Instrument Development ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Development Effort ◽  
Subsurface Structure ◽  
Structure Changes ◽  
Reactor Cell ◽  
Reactive Gas

AbstractWe report a unique in situ instrument development effort dedicated to studying gas/solid interactions relevant to heterogeneous catalysis and early stages of oxidation of materials via atom probe tomography and microscopy (APM). An in situ reactor cell, similar in concept to other reports, has been developed to expose nanoscale volumes of material to reactive gas environments, in which temperature, pressure, and gas chemistry are well controlled. We demonstrate that the combination of this reactor cell with APM techniques can aid in building a better mechanistic understanding of resultant composition and surface and subsurface structure changes accompanying gas/surface reactions in metal and metal alloy systems through a series of case studies: O2/Rh, O2/Co, and O2/Zircaloy-4. In addition, the basis of a novel operando mode of analysis within an atom probe instrument is also reported. The work presented here supports the implementation of APM techniques dedicated to atomic to near-atomically resolved gas/surface interaction studies of materials broadly relevant to heterogeneous catalysis and oxidation.

scholarly journals An in-situ approach for preparing atom probe tomography specimens by xenon plasma-focussed ion beam

2019 ◽  
Vol 202 ◽  
pp. 121-127 ◽  
Author(s):  
J.E. Halpin ◽  
R.W.H. Webster ◽  
H. Gardner ◽  
M.P. Moody ◽  
P.A.J. Bagot ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Ion Beam ◽  
Atom Probe ◽  
Focussed Ion Beam

scholarly journals In-situ and In-operando Cobalt Oxidation Studied by Atom Probe Tomography

2020 ◽  
Vol 26 (S2) ◽  
pp. 1872-1873
Author(s):  
Sten Lambeets ◽  
Mark Wirth ◽  
Graham Orren ◽  
Norbert Kruse ◽  
Daniel Perea
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Cobalt Oxidation ◽  
In Operando

Electron Beam-Induced Deposition for Atom Probe Tomography Specimen Capping Layers

2016 ◽  
Vol 23 (2) ◽  
pp. 321-328 ◽  
Author(s):  
David R. Diercks ◽  
Brian P. Gorman ◽  
Johannes J. L. Mulders
Keyword(s):  
Electron Beam ◽  
Atom Probe Tomography ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Atom Probe ◽  
Near Surface ◽  
Surface Features ◽  
Dicobalt Octacarbonyl ◽  
Electron Beam Induced Deposition

AbstractSix precursors were evaluated for use as in situ electron beam-induced deposition capping layers in the preparation of atom probe tomography specimens with a focus on near-surface features where some of the deposition is retained at the specimen apex. Specimens were prepared by deposition of each precursor onto silicon posts and shaped into sub-70-nm radii needles using a focused ion beam. The utility of the depositions was assessed using several criteria including composition and uniformity, evaporation behavior and evaporation fields, and depth of Ga+ ion penetration. Atom probe analyses through depositions of methyl cyclopentadienyl platinum trimethyl, palladium hexafluoroacetylacetonate, and dimethyl-gold-acetylacetonate [Me2Au(acac)] were all found to result in tip fracture at voltages exceeding 3 kV. Examination of the deposition using Me2Au(acac) plus flowing O2 was inconclusive due to evaporation of surface silicon from below the deposition under all analysis conditions. Dicobalt octacarbonyl [Co2(CO)8] and diiron nonacarbonyl [Fe2(CO)9] depositions were found to be effective as in situ capping materials for the silicon specimens. Their very different evaporation fields [36 V/nm for Co2(CO)8 and 21 V/nm for Fe2(CO)9] provide options for achieving reasonably close matching of the evaporation field between the capping material and many materials of interest.

Martensite to austenite reversion in a high-Mn steel: Partitioning-dependent two-stage kinetics revealed by atom probe tomography, in-situ magnetic measurements and simulation

2019 ◽  
Vol 166 ◽  
pp. 178-191 ◽  
Author(s):  
I.R. Souza Filho ◽  
A. Kwiatkowski da Silva ◽  
M.J.R. Sandim ◽  
D. Ponge ◽  
B. Gault ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Magnetic Measurements ◽  
Atom Probe ◽  
Two Stage ◽  
Mn Steel

scholarly journals Vacancy-controlled ultrastable nanoclusters in nanostructured ferritic alloys

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Z. W. Zhang ◽  
L. Yao ◽  
X.-L. Wang ◽  
M. K. Miller
Keyword(s):  
Atom Probe Tomography ◽  
State Of The Art ◽  
Atom Probe ◽  
High Dose ◽  
Ferritic Alloy ◽  
Ferritic Alloys ◽  
New Class ◽  
O Vacancy ◽  
Dose Radiation

Abstract A new class of advanced structural materials, based on the Fe-O-vacancy system, has exceptional resistance to high-temperature creep and excellent tolerance to extremely high-dose radiation. Although these remarkable improvements in properties compared to steels are known to be associated with the Y-Ti-O-enriched nanoclusters, the roles of vacancies in facilitating the nucleation of nanoclusters are a long-standing puzzle, due to the experimental difficulties in characterizing vacancies, particularly in-situ while the nanoclusters are forming. Here we report an experiment study that provides the compelling evidence for the presence of significant concentrations of vacancies in Y-Ti-O-enriched nanoclusters in a nanostructured ferritic alloy using a combination of state-of-the-art atom-probe tomography and in situ small angle neutron scattering. The nucleation of nanoclusters starts from the O-enriched solute clustering with vacancy mediation. The nanoclusters grow with an extremely low growth rate through attraction of vacancies and O:vacancy pairs, leading to the unusual stability of the nanoclusters.

On low temperature bainite transformation characteristics using in-situ neutron diffraction and atom probe tomography

2014 ◽  
Vol 589 ◽  
pp. 303-309 ◽  
Author(s):  
Khushboo Rakha ◽  
Hossein Beladi ◽  
Ilana Timokhina ◽  
Xiangyuan Xiong ◽  
Saurabh Kabra ◽  
...  
Keyword(s):  
Low Temperature ◽  
Neutron Diffraction ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
Bainite Transformation ◽  
In Situ Neutron Diffraction

scholarly journals In-Situ Deuterium Charging for Direct Detection of Hydrogen in Vanadium by Atom Probe Tomography

2015 ◽  
Vol 21 (S3) ◽  
pp. 695-696 ◽  
Author(s):  
S. Dumpala ◽  
D. Haley ◽  
S.R. Broderick ◽  
P.A.J. Bagot ◽  
M. P. Moody ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Direct Detection ◽  
Atom Probe
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