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Your search keyword '"Belkacemi, Lisa T."' showing total 8 results
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8 results on '"Belkacemi, Lisa T."'

1. Towards establishing best practice in the analysis of hydrogen and deuterium by atom probe tomography

Author

Gault, Baptiste, Saksena, Aparna, Sauvage, Xavier, Bagot, Paul, Aota, Leonardo S., Arlt, Jonas, Belkacemi, Lisa T., Boll, Torben, Chen, Yi-Sheng, Daly, Luke, Djukic, Milos B., Douglas, James O., Duarte, Maria J., Felfer, Peter J., Forbes, Richard G., Fu, Jing, Gardner, Hazel M., Gemma, Ryota, Gerstl, Stephan S. A., Gong, Yilun, Hachet, Guillaume, Jakob, Severin, Jenkins, Benjamin M., Jones, Megan E., Khanchandani, Heena, Kontis, Paraskevas, Krämer, Mathias, Kühbach, Markus, Marceau, Ross K. W., Mayweg, David, Moore, Katie L., Nallathambi, Varatharaja, Ott, Benedict C., Poplawsky, Jonathan D, Prosa, Ty, Pundt, Astrid, Saha, Mainak, Schwarz, Tim M., Shang, Yuanyuan, Shen, Xiao, Vrellou, Maria, Yu, Yuan, Zhao, Yujun, Zhao, Huan, and Zou, Bowen

Subjects
Condensed Matter - Materials Science
Abstract

As hydrogen is touted as a key player in the decarbonization of modern society, it is critical to enable quantitative H analysis at high spatial resolution, if possible at the atomic scale. Indeed, H has a known deleterious impact on the mechanical properties (strength, ductility, toughness) of most materials that can hinder their use as part of the infrastructure of a hydrogen-based economy. Enabling H mapping, including local hydrogen concentration analyses at specific microstructural features, is essential for understanding the multiple ways that H affect the properties of materials, including for instance embrittlement mechanisms and their synergies, but also spatial mapping and quantification of hydrogen isotopes is essential to accurately predict tritium inventory of future fusion power plants, ensuring their safe and efficient operation for example. Atom probe tomography (APT) has the intrinsic capabilities for detecting hydrogen (H), and deuterium (D), and in principle the capacity for performing quantitative mapping of H within a material's microstructure. Yet the accuracy and precision of H analysis by APT remain affected by the influence of residual hydrogen from the ultra-high vacuum chamber that can obscure the signal of H from within the material, along with a complex field evaporation behavior. The present article reports the essence of discussions at a focused workshop held at the Max-Planck Institute for Sustainable Materials in April 2024. The workshop was organized to pave the way to establishing best practices in reporting APT data for the analysis of H. We first summarize the key aspects of the intricacies of H analysis by APT and propose a path for better reporting of the relevant data to support interpretation of APT-based H analysis in materials.

Published
2024

7. Intrinsic heterogeneity of grain boundary states in ultrafine-grained Ni: a multi-level study by SIMS and radiotracer analyses

Author

Martinelli, Laure, Rebrab-Belkacemi, Lisa T., Mayur, Vaidya, Hassanpour, A, Jomard, François, Irmer, Daniel, Duhamel, Cécilie, Wilder, G, Esin, Vladimir, Divinski, Sergyi, Laboratoire de Modélisation, Thermodynamique et Thermochimie (LM2T), Service de la Corrosion et du Comportement des Matériaux dans leur Environnement (SCCME), Département de Physico-Chimie (DPC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Département de Physico-Chimie (DPC), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
[CHIM.MATE]Chemical Sciences/Material chemistry
Abstract

International audience; Ultra-fast diffusion rates were largely reported in ultrafine-grained (UFG) materials procuded by severe plastic deformation (SPD) and were explained by the formation of specific non-relaxed high-angle "deformation-modified" grain boundaries exhibiting an increased free energy density, higher diffusion rates and a significant residual microstrain [1]. The increase of the grain boundary (GB) diffusion coefficients accounts for one to several orders of magnitude with respect to relaxed interfaces with similar misorientation characteristics [1]. In this work, using both radiotracer and SIMS techniques [2] Cr diffusion in UFG Ni was investigated at low temperatures ranging from 403 to 603 K and a whole spectrum of possible grain boundary states was addressed. The combination of the two methods provided unprecedented insights into structure properties relationships in severely deformed Ni. Abnormally high diffusion rates of Cr are measured and the presence of the deformation-modified state of a fraction of the high-angle GBs is verified. For the first time, a co-existence of relaxed and deformation-modified high-angle GBs in UFG Ni is unambiguously established, addressing the different interfaces by different techniques on the same samples. The temperature/time evolution of the deformation-modified state of high-angle GBs is followed by dedicated measurements of the atomic transport and the microstructure characteristics. The combination of the two complementary techniques allows a unique cross-scale multi-level characterization of the grain boundary diffusion properties spread over a large number of orders of magnitude in the same material.References[1] X. Sauvage, G. Wilde, S.V. Divinski, Z. Horita, R.Z. Valiev, Materials Science and Engineering: A. 540 (2012) pp. 1-12. [2] D. Gärtner, L. Belkacemi, V.A. Esin, F. Jomard, A.A. Fedotov, J. Schell, J.V. Osinskaya, A.V. Pokoev, C. Duhamel, A. Paul, S.V. Divinski, Diffusion Foundations. 29 (2021) pp. 31-73.

Published
2021

8. Towards Establishing Best Practice in the Analysis of Hydrogen and Deuterium by Atom Probe Tomography.

Author

Gault B, Saksena A, Sauvage X, Bagot P, Aota LS, Arlt J, Belkacemi LT, Boll T, Chen YS, Daly L, Djukic MB, Douglas JO, Duarte MJ, Felfer PJ, Forbes RG, Fu J, Gardner HM, Gemma R, Gerstl SSA, Gong Y, Hachet G, Jakob S, Jenkins BM, Jones ME, Khanchandani H, Kontis P, Krämer M, Kühbach M, Marceau RKW, Mayweg D, Moore KL, Nallathambi V, Ott BC, Poplawsky JD, Prosa T, Pundt A, Saha M, Schwarz TM, Shang Y, Shen X, Vrellou M, Yu Y, Zhao Y, Zhao H, and Zou B

Abstract

As hydrogen is touted as a key player in the decarbonization of modern society, it is critical to enable quantitative hydrogen (H) analysis at high spatial resolution and, if possible, at the atomic scale. H has a known deleterious impact on the mechanical properties (strength, ductility, toughness) of most materials that can hinder their use as part of the infrastructure of a hydrogen-based economy. Enabling H mapping including local hydrogen concentration analyses at specific microstructural features is essential for understanding the multiple ways that H affect the properties of materials including embrittlement mechanisms and their synergies. In addition, spatial mapping and quantification of hydrogen isotopes is essential to accurately predict tritium inventory of future fusion power plants thus ensuring their safe and efficient operation. Atom probe tomography (APT) has the intrinsic capability to detect H and deuterium (D), and in principle the capacity for performing quantitative mapping of H within a material's microstructure. Yet, the accuracy and precision of H analysis by APT remain affected by complex field evaporation behavior and the influence of residual hydrogen from the ultrahigh vacuum chamber that can obscure the signal of H from within the material. The present article reports a summary of discussions at a focused workshop held at the Max-Planck Institute for Sustainable Materials in April 2024. The workshop was organized to pave the way to establishing best practices in reporting APT data for the analysis of H. We first summarize the key aspects of the intricacies of H analysis by APT and then propose a path for better reporting of the relevant data to support interpretation of APT-based H analysis in materials., Competing Interests: Conflict of Interest The authors declare that they have no competing interest., (© The Author(s) 2024. Published by Oxford University Press on behalf of the Microscopy Society of America.)

Published
2024
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