Workshop: Hydrogen Analysis by Atom Probe Tomography

Session

Background and instrumentation

16 Apr 2024, 11:50

Room 203 (large seminar room) (Max-Planck-Institut für Eisenforschung GmbH)

13. Background knowledge about hydrogen behaviour in the context of field ion emitters

Richard G. Forbes

16/04/2024, 11:50

This presentation provides a reminder of our existing background knowledge about how hydrogen behaves in the context of field ion emitters. This may or may not prove to be of detailed relevance to the analysis of hydrogen-related atom-probe data, but it would probably be useful to have it available as background information. The following behavioural effects will be noted.
(*1) The likely...

25. Experimental approaches to maximise accurate APT hydrogen-quantification in metallurgical materials

Paul A. J. Bagot (St. Catherine's College Lecturer, University of Oxford, Department of Materials)

16/04/2024, 12:10

Across a wide-range of applications in materials science, there is growing interest in being able to accurately detect, locate and quantify the presence of hydrogen in the microstructures of materials. These include modern high-strength steels, Ni-alloys and Ti-alloys for aerospace and other engineering applications, broadly aiming to understand how to make components more resistant to the...

5. Pulsed laser experiments in an ultra-low H atom probe

Peter Felfer (Friedrich-Alexander Universität Erlangen-Nürnberg)

17/04/2024, 09:45

While atom probe experiments to detect hydrogen are not new, special measures had to be taken to distinguish the H detected from the specimen from the contaminant unless molecular ion formation enabled identification. This is largely due to the residual hydrogen in conventional stainless steel atom probes. The distinction was mostly made by isotope, using deuterium or recently even tritium as...

7. Exploring measurement parameters and modes of the newest generation of LEAP instruments for quantification of hydrogen

Severin Jakob (Chalmers University of Technology)

17/04/2024, 10:05

So far, the most common practice for measuring H at microstructural features in APT is using the heavier isotope deuterium in combination with voltage pulses. For metals with a high evaporation field, including steels, the formation of H2+ ions is inhibited. Hence, the peak at 2 Da can solely be attributed to D, which was introduced via electrochemical or gas charging, or implantation. But...