Constantinos Hatzoglou, de l’Université Norvégienne de Science et Technologie (NTNU), donnera un séminaire le lundi 6 octobre à 10h30 au GPM en salle de conférence 2.26, d’une durée de 30 minutes, intitulé : « Enhancement of APT measurements via dynamic reconstruction ».

Constantinos Hatzoglou, from the Norwegian University of Science and Technology (NTNU), will give a seminar on Monday, October 6 at 10:30 a.m. at GPM in conference room 2.26. The seminar will be 30 minutes long and is entitled: “Enhancement of APT measurements via dynamic reconstruction.”

Abstract:

Atom probe tomography (APT) enables three-dimensional elemental mapping of materials with sub-nanometer resolution, making it a powerful technique for nanoscale characterization. However, conventional reconstructions typically rely on fixed reconstruction parameters such as the field factor and image compression factor, which can introduce systematic inaccuracies, particularly when analyzing deeper regions of a specimen. In this work, a dynamic reconstruction strategy is introduced that continuously adjusts these parameters in response to the evolving specimen morphology during field evaporation. Applied to aluminum and nickel alloys containing nanoscale particles, this approach significantly improves the accuracy of particle size and shape measurements, effectively correcting biases inherent in standard methods. The results demonstrate that dynamic reconstruction provides a more faithful representation of complex microstructural features and is especially valuable for modern APT instruments capable of probing large volumes, where cumulative errors are more pronounced. In addition, the implementation of this method within the IVAS software environment is described, enabling users to readily integrate dynamic reconstruction into their own analyses for more precise and reliable microstructural characterization.