scholarly journals Development of an Energy-Sensitive Detector for the Atom Probe Tomography

2021 ◽  
pp. 1-16
Author(s):  
Christian Bacchi ◽  
Gérald Da Costa ◽  
Emmanuel Cadel ◽  
Fabien Cuvilly ◽  
Jonathan Houard ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Sensitive Detector ◽  
Mass Peak ◽  
Peak Overlap ◽  
Thin Carbon ◽  
New Type ◽  
Carbon Foils ◽  
New Generation ◽  
The Impact

A position and energy-sensitive detector has been developed for atom probe tomography (APT) instruments in order to deal with some mass peak overlap issues encountered in APT experiments. Through this new type of detector, quantitative and qualitative improvements could be considered for critical materials with mass peak overlaps, such as nitrogen and silicon in TiSiN systems, or titanium and carbon in cemented carbide materials. This new detector is based on a thin carbon foil positioned on the front panel of a conventional MCP-DLD detector. According to several studies, it has been demonstrated that the impact of ions on thin carbon foils has the effect of generating a number of transmitted and reflected secondary electrons. The number generated mainly depends on both the kinetic energy and the mass of incident particles. Despite the fact that this phenomenon is well known and has been widely discussed for decades, no studies have been performed to date for using it as a means to discriminate particles energy. Therefore, this study introduces the first experiments on a potential new generation of APT detectors that would be able to resolve mass peak overlaps through the energy-sensitivity of thin carbon foils.

scholarly journals Single-Ion Deconvolution of Mass Peak Overlaps for Atom Probe Microscopy

2017 ◽  
Vol 23 (2) ◽  
pp. 300-306 ◽  
Author(s):  
Andrew J. London ◽  
Daniel Haley ◽  
Michael P. Moody
Keyword(s):  
Kinetic Energy ◽  
Point Cloud ◽  
Atom Probe ◽  
Resolving Power ◽  
Isotopic Abundance ◽  
Mass Peak ◽  
Peak Overlap ◽  
Mass Resolving Power ◽  
Charge Spectrum ◽  
Isotopic Abundances

AbstractDue to the intrinsic evaporation properties of the material studied, insufficient mass-resolving power and lack of knowledge of the kinetic energy of incident ions, peaks in the atom probe mass-to-charge spectrum can overlap and result in incorrect composition measurements. Contributions to these peak overlaps can be deconvoluted globally, by simply examining adjacent peaks combined with knowledge of natural isotopic abundances. However, this strategy does not account for the fact that the relative contributions to this convoluted signal can often vary significantly in different regions of the analysis volume; e.g., across interfaces and within clusters. Some progress has been made with spatially localized deconvolution in cases where the discrete microstructural regions can be easily identified within the reconstruction, but this means no further point cloud analyses are possible. Hence, we present an ion-by-ion methodology where the identity of each ion, normally obscured by peak overlap, is resolved by examining the isotopic abundance of their immediate surroundings. The resulting peak-deconvoluted data are a point cloud and can be analyzed with any existing tools. We present two detailed case studies and discussion of the limitations of this new technique.

scholarly journals Laser-assisted atom probe tomography of semiconductors: The impact of the focused-ion beam specimen preparation

2018 ◽  
Vol 188 ◽  
pp. 19-23 ◽  
Author(s):  
J. Bogdanowicz ◽  
A. Kumar ◽  
C. Fleischmann ◽  
M. Gilbert ◽  
J. Houard ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Atom Probe ◽  
Beam Specimen ◽  
Specimen Preparation ◽  
The Impact

Effect of Thermal Aging on Microstructural Evolution in Ferrite of Duplex Stainless Steel in Nuclear Power Plant Applications

2017 ◽  
Vol 898 ◽  
pp. 818-825
Author(s):  
B. Zhang ◽  
F. Xue ◽  
S.L. Li ◽  
Xi Tao Wang ◽  
N.N. Liang ◽  
...  
Keyword(s):  
Aging Time ◽  
Thermal Aging ◽  
Atom Probe Tomography ◽  
Nuclear Power ◽  
Impact Test ◽  
Atom Probe ◽  
Nanoindentation Test ◽  
Α Phase ◽  
The Impact ◽  
Duplex Steels

Z3CN20-09M duplex steels are thermally aged at 400oC for up to 20,000 h. The mechanical properties have been characterized by Charpy V-notch impact test and nanoindentation test. It is found that the nanohardness in ferrite increases and the impact toughness decreases with aging time. Moreover, the distribution of alloying elements has been carefully characterized using atom probe tomography (APT). The results indicate that the ferrite decomposes into Cr-rich α' and Cr-lean α phase during the thermal aging and Ni-rich G-phase forms in ferrite. The effect of aging time on solute nanostructure has been investigated systematically.

Atom probe tomography assessment of the impact of electron beam exposure on InxGa1−xN/GaN quantum wells

2011 ◽  
Vol 99 (2) ◽  
pp. 021906 ◽  
Author(s):  
Samantha E Bennett ◽  
David W Saxey ◽  
Menno J Kappers ◽  
Jonathan S Barnard ◽  
Colin J Humphreys ◽  
...  
Keyword(s):  
Electron Beam ◽  
Quantum Wells ◽  
Atom Probe Tomography ◽  
Atom Probe ◽  
The Impact

An Automated Computational Approach for Complete In-Plane Compositional Interface Analysis by Atom Probe Tomography

2019 ◽  
Vol 25 (2) ◽  
pp. 389-400 ◽  
Author(s):  
Zirong Peng ◽  
Yifeng Lu ◽  
Constantinos Hatzoglou ◽  
Alisson Kwiatkowski da Silva ◽  
Francois Vurpillot ◽  
...  
Keyword(s):  
Atom Probe Tomography ◽  
Atom Probe ◽  
Computational Approach ◽  
Field Evaporation ◽  
Experimental Dataset ◽  
Interface Analysis ◽  
Quantitative Mapping ◽  
Detailed Evaluation ◽  
Compositional Variations ◽  
The Impact

AbstractWe introduce an efficient, automated computational approach for analyzing interfaces within atom probe tomography datasets, enabling quantitative mapping of their thickness, composition, as well as the Gibbsian interfacial excess of each solute. Detailed evaluation of an experimental dataset indicates that compared with the composition map, the interfacial excess map is more robust and exhibits a relatively higher resolution to reveal compositional variations. By field evaporation simulations with a predefined emitter mimicking the experimental dataset, the impact of trajectory aberrations on the measurement of the thickness, composition, and interfacial excess of the decorated interface are systematically analyzed and discussed.

scholarly journals Microstructure of Z-Phase Strengthened Martensitic Steels: Meeting the 650°C Challenge

2016 ◽  
Vol 879 ◽  
pp. 1147-1152 ◽  
Author(s):  
Fang Liu ◽  
Masoud Rashidi ◽  
John Hald ◽  
Lutz Reißig ◽  
Hans Olof Andrén
Keyword(s):  
Electron Microscopy ◽  
Atom Probe Tomography ◽  
Prior Austenite ◽  
Atom Probe ◽  
Martensitic Steels ◽  
Austenite Grain ◽  
Transmission Electron ◽  
Governing Factor ◽  
The Impact ◽  
Prior Austenite Grain

We studied three series of Z-phase strengthened steels using scanning electron microscopy, transmission electron microscopy, and atom probe tomography to reveal the detailed microstructure of these steels. In particular, the phase transformation from M(C,N) to Z-phase (CrMN) was studied. Carbon content in the steels is the governing factor in this transformation. The impact toughness of some test alloys was rather low. This is attributed to the formation of a continuous W-rich film along prior austenite grain boundaries. Cu and C addition to the test alloys changed Laves phase morphology to discrete precipitates and improved toughness dramatically. BN particles were found in some steels. Formation of BN is directly linked to the B concentration in the steels.

Overcoming stereotypes of renewable energy

2019 ◽  
pp. 124-136
Author(s):  
Victor D. Gazman
Keyword(s):  
Renewable Energy ◽  
Empirical Analysis ◽  
Energy Generation ◽  
New Paradigm ◽  
Financial Instrument ◽  
Promising Direction ◽  
Investment Projects ◽  
Power Stations ◽  
New Generation ◽  
The Impact

The article considers prerequisites for the formation of a new paradigm in the energy sector. The factors that may affect the imminent change of leadership among the energy generation are analyzed. The variability of the projects of creation and functioning of power stations is examined. The focus is made on problematic aspects of the new generation, especially, storage and supply of energy, achieving a system of parity that ensures balance in pricing generations. The author substantiates the principles of forming system of parities arising when comparing traditional and new generations. The article presents the results of an empirical analysis of the 215 projects for the construction of facilities for renewable energy. The significance and direction of the impact of these factors on the growth in investment volumes of transactions are determined. The author considers leasing as an effective financial instrument for overcoming stereotypes of renewable energy and as a promising direction for accelerated implementation of investment projects.

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