Atom Probe Tomography and Microscopy 2020 Oxford (Virtual) th th 16 - 18 November 2020 Website: https://aptm2020.web.ox.ac.uk/ @2020atom #APTM2020 ATOM PROBE TOMOGRAPHY AND MICROSCOPY 2020 1 ATOM PROBE TOMOGRAPHY AND MICROSCOPY 2020 2 Dear Colleagues, Welcome to the Virtual Atom Probe and Tomography 2020 Conference. It was with great regret that we cancelled our original plans to welcome you all to Oxford for APT&M 2020, the 57th Meeting of the International Field Emission Society. We were honoured to be given the opportunity to host this conference and had been working excitedly over the course of the past two years towards this end. However, in the words of our fellow Oxfordian, J. R. R. Tolkien, “It does not do to leave a live dragon out of your calculations, if you live near him”, and as the Covid-19 global pandemic increasingly encroached upon all of our daily lives, sadly our plans for APT&M 2020 were not to be. Our IFES community can take great heart from the initial response to the call for abstracts. We received 240 abstracts from 190 unique presenting authors. Abstracts touted a diverse range of scientific research, across a broad spectrum of topics and disciplines. A significant number of these abstracts were from students, however, we received submissions from researchers across all stages of their scientific careers. This all speaks to the continued growth and vibrancy of this scientific community, and motivated our decision, together with the IFES Steering Committee, to host this Virtual APT&M meeting, as an opportunity for us all to come together. We are particularly pleased to be able to incorporate some of the key features of the conventional conference that make our meeting so special. This includes the E. W. Müller Outstanding Emerging Scientist Award. The current finalists look set to once again reach the highest of standards set in previous contests. The conference will also feature the Jochen H. Block Lecture, which will highlight scientific achievements of Dr Oana Cojocaru-Mirédin and her contributions to the field. We hope you enjoy the V-APT&M 2020. However, we also look forward to brighter days and eventually meeting again with all our colleagues face-to-face at the next instalment of the APT&M conference series, wherever in the world that may take us. Until then, stay safe. All the best V-APT&M Organising Committee: Paul Bagot, Megan Carter, James Douglas, Hazel Gardner, Daniel Haley, Ben Jenkins and Michael Moody ATOM PROBE TOMOGRAPHY AND MICROSCOPY 2020 i Sponsors V-APT&M are grateful for the support of Premier Sponsors Cameca ATOM PROBE TOMOGRAPHY AND MICROSCOPY 2020 ii Sponsors Poster Session Thank you to all researchers that have submitted short pre-recorded submissions to the ‘Mini-Presentation Symposium’. All presentations can be viewed online here. ATOM PROBE TOMOGRAPHY AND MICROSCOPY 2020 iii Conference Programme Monday 16th November - E. W. Müller Outstanding Emerging Scientist Award Time Talk Title Speaker (GMT) 13:00 - 13:10 Introduction Atom probe observation of hydrogen in steel 13:10 - 13:40 Eason Chen microstructures Development of a wide field of view three dimensional field ion microscope and high 13:40 - 14:10 Benjamin Klaes fidelity reconstruction algorithm to investigate small defect in materials Imaging individual solute atoms at crystalline 14:10 - 14:40 Shyam Katnagallu imperfections in metals 14:40 - 15:00 Break Towards Model-Driven Reconstruction in Atom 15:00 - 15:30 Charles Fletcher Probe Tomography Development of an energy-sensitive detector for 15:30 - 16:00 Christian Bacchi the Atom Probe Tomography Scanning probe microscopy for atom probe tip 16:00 - 16:30 Jonathan Op de Beeck shape monitoring 16:30 - 16:40 Closing Remarks Tuesday 17th November Time Talk Title Speaker (GMT) 13:00 - 13:10 Award Announcements J.H. Block Lecture: ‘Uncovering composition-property relationships 13:10 - 14:00 Dr Oana Cojocaru-Mirédin of energy materials by atom probe tomography and correlative microscopy’ Monazite (REEPO4) nanogeochronology and 14:00 - 14:20 Denis Fougerouse applications to deformation microstructures Crystallographic characterization of grain 14:20 - 14:40 Yuan Wu boundary by APT in a bcc alloy Irradiation and thermal ageing of low Cu, high Ni 14:40 - 15:00 Kristina Lindgren and Mn RPV weld metal 15:00 - 15:20 Break Towards enhanced atom probe tomography 15:20 - 15:40 Ayman El-Zoka characterization of chemical systems Revealing the dependence of Au segregation on 15:40 - 16:00 dislocation character in Pt-Au via cross- Xuyang Zhou correlative microscopy Nanoparticle APT analysis through a pick-and- 16:00 - 16:20 Jan Josten coat method 16:20 - 16:40 Extreme Ultraviolet Atom Probe Tomography Ann Chiaramonti 16:40 - 16:50 Closing Remarks ATOM PROBE TOMOGRAPHY AND MICROSCOPY 2020 iv Conference Programme (continued) Wednesday 18th November Time Talk Title Speaker (GMT) 13:00 - 13:10 Introduction UHV-Cryo transfer suite for preparation and 13:10 - 13:30 transfer of samples between glovebox, SEM-FIB Ingrid McCarroll and APT Atom probe microscopy of the early stages of 13:30 - 13:50 Felix Theska direct ageing of Alloy 718 Elemental partitioning and site-occupancy in 13:50 - 14:10 gamma/gamma’ -strengthened Co-Ti-base Pyuck-Pa Choi alloys The stability of γ′ precipitates in a multi- 14:10 - 14:30 component FeCoNiCrTi0.2 alloy under ion Guma Yeli irradiation 14:30 - 14:50 Break Tracing microalloy precipitation in Nb-Ti 14:50 - 15:10 Johannes Webel microalloyed steels during austenite conditioning Preferential Segregation of Impurities to Grain 15:10 - 15:30 Olivia Licata Boundaries in Y-TZP Improved Atom Probe Reconstruction Through 15:30 - 15:50 Tip Shape Constraints Supplied by Scanning Claudia Fleischmann Probe Microscopy Project Tomo: In Pursuit of Atomic-Scale 15:50 - 16:10 Tom Kelly Analytical Tomography 16:10 - 16:20 Conference Closing Remarks Time Zone Planner USA Europe Asia/Australia Time Time Time Time Time Time Time Time Time Time (China/ (GMT) (PST) (MST) (CST) (EST) (CET) (Moscow) (JST) (AEDT) Perth) 13:00 05:00 06:00 07:00 08:00 14:00 16:00 21:00 22:00 00:00 14:00 06:00 07:00 08:00 09:00 15:00 17:00 22:00 23:00 01:00 15:00 07:00 08:00 09:00 10:00 16:00 18:00 23:00 00:00 02:00 16:00 08:00 09:00 10:00 11:00 17:00 19:00 00:00 01:00 03:00 ATOM PROBE TOMOGRAPHY AND MICROSCOPY 2020 v E. W. MÜLLER OUTSTANDING EMERGING SCIENTIST AWARD Atom probe observation of hydrogen in steel microstructures Yi-Sheng Chen1,2 & Julie M. Cairney 1,2 1) Australian Centre for Microscopy and Microanalysis, The University of Sydney, NSW 2006, Australia 2) School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia The presence of hydrogen in steels can lead to catastrophic embrittlement/early-fracture. This is a serious issue for hydrogen transportation and storage. However, consensus has not been reached on the exact mechanism of hydrogen embrittlement, mainly due to the difficulty to provide direct evidence of the hydrogen-materials interactions that underpins the hypotheses [1]. In addition, a proposed solution to hydrogen embrittlement by using steels that contain hydrogen traps such as carbide precipitates [2], is limited in its effectiveness, due to the inability to directly observe the proposed hydrogen trapping at microstructural features. As such, we used atom probe to study the hydrogen distribution at key features, including dislocations [4], grain boundaries [4], and both incoherent [4] and coherent [3] carbide precipitates in BCC/BCT iron matrix. To enable these studies, we charged the sample with deuterium (a hydrogen isotope) to avoid ambiguity from background hydrogen, and utilised a custom cryogenic sample transfer protocol to allow sufficient signal to be retained for observations. These efforts lead to the confirmations of: i) hydrogen enrichment at dislocations (Figure A and B), providing a concrete validation of the hydrogen-enhanced dislocation mobility theory of embrittlement; ii) hydrogen enrichment at grain boundaries (Figure C and D), underpinning the hydrogen-enhanced grain boundary decohesion theory; iii) the hydrogen at the interface between large, incoherent precipitates and the surrounding steel matrix, settling a long-standing debate around whether hydrogen trapping is an interfacial effect; and iv) the hydrogen at the interior of small, coherent carbides, suggesting hydrogen can internalise into carbides under certain conditions. [1] I. M. Robertson, et al. Metall. Mater. Trans. A 46a(6), 2323-2341 (2015) [2] H. K. D. H. Bhadeshia, ISIJ Int. 56, 24-36 (2016) [3] Y.-S. Chen et al., Science 355, 1196-1199 (2017) [4] Y.-S. Chen et al., Science 367, 171-175 (2020) ATOM PROBE TOMOGRAPHY AND MICROSCOPY 2020 1 E. W. MÜLLER OUTSTANDING EMERGING SCIENTIST AWARD Development of a wide field of view three dimensional field ion microscope and high fidelity reconstruction algorithm to investigate small defect in materials Benjamin Klaes 1, Rodrigue Larde 1, Fabien Delaroche 1, Bertrand Radiguet 1, Constantinos Hatzoglou 1, Jeoffrey Renaux 1 & François Vurpillot 1 1) Normandie Université, UNIROUEN, INSA Rouen, CNRS, Groupe de Physique des Matériaux, 76000 Rouen, France. Field Ion Microscopy (FIM), invented in 1951 by Erwin Muller, is the predecessor of the Atom Probe Tomography (APT). It is the first microscopy technique allowing a direct imaging of individual atoms at the surface of a material [1,2]. From several decades FIM remained a 2D surface microscope principally used to select analysis regions for Atom Probe Tomography. Nevertheless, field evaporation allows to records images with a sub-angstrom precision at different depths in the material. The ability to localized the 3D positions of individual atoms has been established by Seidman et al.