Imaging individual solute atoms at crystalline imperfections in metals

Autor: Shyam Katnagallu, Leigh T Stephenson, Isabelle Mouton, Christoph Freysoldt, Aparna P A Subramanyam, Jan Jenke, Alvin N Ladines, Steffen Neumeier, Thomas Hammerschmidt, Ralf Drautz, Jörg Neugebauer, François Vurpillot, Dierk Raabe, Baptiste Gault

Publikováno v: New Journal of Physics, Vol 21, Iss 12, p 123020 (2019)

Directly imaging all atoms constituting a material and, maybe more importantly, crystalline defects that dictate materials’ properties, remains a formidable challenge. Here, we propose a new approach to chemistry-sensitive field-ion microscopy (FIM

Externí odkaz: https://doaj.org/article/6d379535708c44b6b0a2967af827393b

A New Class of Cluster-Matrix Nanocomposite Made of Fully Miscible Components

Autor: Gleb Iankevich, Abhishek Sarkar, Shyam Katnagallu, Mohammed Reda Chellali, Di Wang, Leonardo Velasco, Ruby Singh, Thomas Reisinger, Robert Kruk, Horst Hahn

Publikováno v: Advanced Materials

Nanocomposite materials, consisting of two or more phases, at least one of which has a nanoscale dimension, play a distinctive role in materials science because of the multiple possibilities for tailoring their structural properties and, consequently

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c0a0c962d2dc0871665dde92e46e0064
http://tuprints.ulb.tu-darmstadt.de/23708/

Revealing atomic-scale vacancy-solute interaction in nickel

Autor: Shyam Katnagallu, Jörg Neugebauer, François Vurpillot, Baptiste Gault, Dierk Raabe, Felipe Ferraz Morgado, Steffen Neumeier, Christoph Freysoldt, Leigh T. Stephenson, Benjamin Klaes

Publikováno v: Scripta Materialia
Scripta Materialia, 2021, 203, pp.114036. ⟨10.1016/j.scriptamat.2021.114036⟩
Scripta Materialia, Elsevier, 2021, 203, pp.114036. ⟨10.1016/j.scriptamat.2021.114036⟩

Imaging individual vacancies in solids and revealing their interactions with solute atoms remains one of the frontiers in microscopy and microanalysis. Here we study a creep-deformed binary Ni-2 at.% Ta alloy. Atom probe tomography reveals a random d

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::edd2519621e915fe0fa20e3922a4d57f
https://normandie-univ.hal.science/hal-03474754

Three-dimensional atomically-resolved analytical imaging with a field ion microscope

Autor: Felipe Ferraz Morgado, Leigh T. Stephenson, Baptiste Gault, Shyam Katnagallu, Isabelle Mouton

Atom probe tomography (APT) helps elucidate the link between the nanoscale chemical variations and physical properties, but it has limited structural resolution. Field ion microscopy (FIM), a predecessor technique to APT, is capable of attaining atom

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d383b1e72e756e7fe0db517ec1d3409f

Chemical segregation and precipitation at anti-phase boundaries in thermoelectric Heusler-Fe2VAl

Autor: Stefan A. Maier, Baptiste Gault, Eric Alleno, Shyam Katnagallu, Abou Diack-Rasselio, Loïc Perrière, Leonie Gomell, Christina Scheu

Publikováno v: Scripta Materialia
Scripta Materialia, Elsevier, 2020, 186, pp.370-374. ⟨10.1016/j.scriptamat.2020.04.037⟩

International audience; Fe2VAl exhibits promising properties for thermoelectric applications. Here, we investigated the microstructure of melt spun Fe2VAl using electron microscopy, atom probe tomography and field ion microscopy. We observe platelet-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8b2674d38dec4255b215f235ef6eabd9
https://hal.archives-ouvertes.fr/hal-03051791