Article
Materials Science, Multidisciplinary
Sudip Kumar Sarkar, Aniruddha Biswas
Summary: This study quantifies the nano-scale micro-hardness and microstructural evolution of a high-Cr binary ferritic Fe-20 at.% Cr alloy during thermal aging using a combination of atom probe tomography, transmission electron microscopy, and small angle neutron scattering. It successfully estimates the mechanical response of the alloy through reliable quantification and suitable hardening models.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Severin Kuechler, Vladimir Vojtech, Stephan S. A. Gerstl, Robin E. Schaeublin, Joerg F. Loeffler
Summary: Binary Fe-Cr alloys are model alloys for ferritic steels proposed as structural materials for future fusion reactors. Through investigating the degradation mechanisms induced by heat and irradiation, the phase decomposition and hardness changes of Fe-Cr alloys were studied. The relationship between alloy strength and the α' structure was found, showing that this type of hardening is a general mechanism for mature systems, independent of the nominal alloy composition.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
G. Magnifouet, M. Vallet, E. Meslin, M. Walls, C. Bouillet, J. Arabski, V. Pierron-Bohnes
Summary: Fe/Cr/Fe trilayers and multilayers were prepared as model systems to provide simple data for diffusion properties in nuclear materials. The structure of these systems was characterized, and it was found that the film structure differed on MgO20nm/SrTiO3 and MgO substrates due to the residual strain in the MgO buffer layer. High-quality superlattices were prepared with coherent epitaxy of Fe and Cr. The in-plane residual strain in Fe varied with substrate, and these strains enhanced the contrast between Fe and Cr.
Article
Materials Science, Multidisciplinary
K. N. Sasidhar, Xuyang Zhou, Michael Rohwerder, Dirk Ponge
Summary: Through optimized conditions, we have conducted short-term, controlled oxidation experiments of Fe-10 at% Cr alloy films at 200 degrees C. Nanoscale structural characterization using four-dimensional scanning transmission electron microscopy (4d-STEM) and chemical characterization using atom probe tomography (APT) have provided insights into the phase transformation pathway during localized, inward-progressing oxidation at low temperature. Direct nucleation of a metastable spinel-structured oxide, with suppression of corundum-structured Cr2O3, has been observed even at the initial stages. A "partitioning-free oxide nucleation mechanism" is proposed to explain the non-equilibrium transformation pathway under highly restricted kinetics conditions.
Article
Chemistry, Physical
Bharat Gwalani, Shivakant Shukla, Donovan Leonard, Jonathan D. Poplawsky, Dean T. Pierce, Libor Kovarik, Govindarajan Muralidharan, Arun Devaraj
Summary: The study investigates the phase stability and microstructural evolution of Ni-Fe-Cr-Al-Ti alloys, and discusses the influence of heat treatment on the alloy's microstructure. Long-term aging was found to result in the coarsening and shape change of gamma' precipitates, as well as the formation of eta phase precipitates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Yan-Ru Lin, Arunodaya Bhattacharya, Da Chen, Yajie Zhao, Ji-Jung Kai, Jean Henry, Steven J. Zinkle
Summary: The study revealed that an increase in helium implantation rate shifts the swelling temperature peak towards higher temperatures in both Fe and Fe-Cr alloys. The formation of Cr-enriched precipitates in Fe-Cr alloys with Cr content above 10 wt% may suppress cavity swelling.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
V. Vojtech, M. Charilaou, A. Kovacs, A. Firlus, S. S. A. Gerstl, R. E. Dunin-Borkowski, J. F. Loeffler, R. E. Schaeublin
Summary: The Fe-Cr alloy system can undergo phase separation and embrittlement when exposed to elevated temperatures and radiation, affecting its magnetic properties. By studying the microstructural decomposition induced by annealing, it is found that increasing annealing time leads to increased hardness, magnetic saturation, and coercivity.
Article
Nanoscience & Nanotechnology
S. Zeisl, A. Lassnig, A. Hohenwarter, F. Mendez-Martin
Summary: The influence of severe plastic deformation on the hardness and precipitation behavior of a Co-free maraging steel was investigated in this study. It was found that severe plastic deformation transformed the microstructure, delayed austenite reversion, and accelerated and influenced the precipitation reaction, thus affecting the characteristics of intermetallic phases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yajie Zhao, Arunodaya Bhattacharya, Cristelle Pareige, Caleb Massey, Pengcheng Zhu, Jonathan D. Poplawsky, Jean Henry, Steven J. Zinkle
Summary: The kinetics of CrRP formation due to particle irradiation were investigated, and it was found that the formation of CrRP can be suppressed under certain irradiation conditions. The distribution of CrRP after irradiation was analyzed using atom probe tomography (APT), and a radiation modified precipitation mechanism was proposed to explain the evolution of CrRP.
Article
Materials Science, Multidisciplinary
Yong-Jie Zhang, Shao-Wen Young, Katherine P. Rice, Mitsutaka Sato, Goro Miyamoto, Tadashi Furuhara, Tadakatsu Ohkubo, Kazuhiro Hono
Summary: The clustering behaviors of solutes in Fe-1.0mass%Cr-0.3mass%N tempered martensite were compared using three atom probe instruments, LEAP 4000 HR, 5000 XR, and 5000 XS. The microstructural features of nanoclusters were measured under the same conditions, and statistical analysis on the Cr atoms' distribution and cluster size was performed on the reconstructed datasets. The results showed that LEAP 5000 XR had a superior capability in detecting Cr nanoclusters in tempered martensite, while the high level of background in the spectrum measured by LEAP 5000 XS limited its application in solute nanocluster detection.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Nanoscience & Nanotechnology
Shipeng Shu, Xiaobing Hu, Maryam Kazemzadeh-Atoufi, Tao Liu, Anyu Shang, Mark B. Davis, Robin Ziebarth, Sandeep Dhingra, Robert D. Morgan, Yao Du, Peter W. Voorhees, David N. Seidman
Summary: This study investigates a phase transformation in a Ni-Cr-Fe-based high-temperature alloy during the carburization process, focusing on the formation and stability of novel austenitic islands within carbide structures. It is shown that the austenitic islands nucleate near the M23C6/M7C3 transformation front and remain relatively stable inside the carbides due to their large sizes and weak Gibbs-Thomson effect.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
F. Vogel, S. Ngai, X. Y. Zhou, E. Zaiser, A. M. Manzoni, Y. Wu, W. W. Zheng, P. Zhang, G. B. Thompson
Summary: The study investigates the hierarchical phase separation behavior and microstructural evolution of a single crystal Fe79.5Si15.5V5.0 alloy using transmission electron microscopy (TEM) and atom probe tomography (APT). A complex maze-like microstructure is formed, and the supersaturation in precipitates with Fe and V drives the formation of plates. The study also explores the potential for improving the properties of high-temperature structural materials through the stabilization of hierarchical microstructures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Jianlei Zhang, Yuxiang Liu, Conghui Hu, Yueshan Jiang, Ahmed Addad, Gang Ji, Changjiang Song, Qijie Zhai
Summary: The effect of Cr content on intragranular kappa-carbide precipitation behaviors in Fe-Mn-Al-Cr-C low-density steels was investigated. It was found that the volume fraction of kappa-carbides decreased and the growth rate slowed down with increasing Cr content. The precipitation temperature and temperature range of kappa-carbides were also affected by the increased Cr content. The presence of Cr atoms in the kappa-carbide structure increased interfacial energy and nucleation energy, making kappa-carbide formation more difficult. The increased interfacial energy, improved solubility of Al and C, and decreased diffusion coefficient of C in gamma-austenite caused by increasing Cr content resulted in a slower growth rate of the kappa-carbides.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Multidisciplinary
Arun Devaraj, Dallin J. Barton, Cheng-Han Li, Sten Lambeets, Tingkun Liu, Anil Battu, Shutthanandan Vaithiyalingam, Suntharampillai Thevuthasan, Feipeng Yang, Jinghua Guo, Tianyi Li, Yang Ren, Libor Kovarik, Daniel E. Perea, Maria L. Sushko
Summary: Understanding the early stages of oxygen-material surface interactions is crucial for various fields including materials degradation, corrosion, geological sciences, forensics, and catalysis. This study demonstrates the use of in situ atom probe tomography to track the diffusion of oxygen and metal ions during the early stages of oxidation of a model alloy. By using O-18 isotope tracers and complementary techniques, the researchers were able to analyze the kinetics of oxidation and determine the primary mechanism for intragranular oxide growth in this alloy.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
A. Gedsun, S. Antonov, T. S. Prithiv, M. Palm
Summary: The composition of the metastable L21 Heusler phase in Fe2AlX alloys (X = Nb, Ta) was determined using atom probe tomography. It was found that the composition of L21 is off-stoichiometric in both systems, but closer to stoichiometric in Fe-Al-Ta alloy. L21 dissolves faster in Fe-Al-Nb(-B) alloy, leading to quicker formation of the stable C14 Laves phase. Doping with boron does not result in the formation of borides, but slight enrichment of boron at the grain boundary of the Fe-Al matrix covered with C14 precipitates is observed.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
G. Da Rosa, P. Maugis, A. Portavoce, J. Drillet, N. Valle, E. Lentzen, K. Hoummada
Article
Materials Science, Multidisciplinary
Arthur Marceaux Dit Clement, Khalid Hoummada, Josee Drillet, Veronique Hebert, Philippe Maugis
JOURNAL OF MATERIALS SCIENCE
(2020)
Article
Materials Science, Multidisciplinary
I Medouni, A. Portavoce, P. Maugis, M. Yescas, F. Roch, P. Joly, A. Compos, C. Dominici, K. Hoummada
JOURNAL OF MATERIALS SCIENCE
(2020)
Article
Materials Science, Multidisciplinary
Arthur Marceaux Dit Clement, Khalid Hoummada, Josee Drillet, Veronique Hebert, Philippe Maugis
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2020)
Article
Materials Science, Multidisciplinary
Mike El Kousseifi, Khalid Hoummada, Federico Panciera, Christian Lavoie, Dominique Mangelinck
Article
Materials Science, Multidisciplinary
Arthur Marceaux Dit Clement, Khalid Hoummada, Josee Drillet, Veronique Hebert, Philippe Maugis
COMPUTATIONAL MATERIALS SCIENCE
(2020)
Article
Chemistry, Physical
Loic Patout, Selma Rabhi, Carine Perrin-Pellegrino, Ahmed Charai, Khalid Hoummada
Article
Engineering, Electrical & Electronic
Soukaina Merselmiz, Zouhair Hanani, Said Ben Moumen, Aleksander Matavz, Daoud Mezzane, Nikola Novak, Zahra Abkhar, Lahoucine Hajji, M'barek Amjoud, Yaovi Gagou, Khalid Hoummada, Dejvid Cresnar, Zdravko Kutnjak, Brigita Rozic
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Multidisciplinary Sciences
I. Medouni, A. Portavoce, P. Maugis, P. Eymeoud, M. Yescas, K. Hoummada
Summary: This study experimentally investigated the influence of the elastic field on atomic segregation in Fe-based alloys, finding that each element segregates either in the edge dislocation core or forms atmospheres. The elastic field strongly affects segregation atmospheres, but has no effect on dislocation core segregation. The theory is in good agreement with experimental results, supporting dislocation engineering.
SCIENTIFIC REPORTS
(2021)
Article
Materials Science, Multidisciplinary
G. Tellouche, D. Mangelinck, K. Hoummada, A. Derafa
Summary: The solid state reaction between 50 nm Ni and Si(100) substrate was investigated using in situ X-ray diffraction. The reaction sequence involves the formation of delta-Ni2Si phase followed by the metastable theta-Ni2Si phase, with simultaneous growth of both phases. The growth mechanism of the non-stoichiometric theta-Ni2Si phase is explained by the presence of two regions with different concentrations, attributed to the discontinuous variation in diffusion coefficient and d-lattice spacing during its growth.
Article
Materials Science, Multidisciplinary
H. Khelidj, A. Portavoce, M. Bertoglio, M. Descoins, L. Patout, K. Hoummada, A. Hallen, A. Charai, M. C. Benoudia, D. Mangelinck
Summary: By depositing Ge1-xSnx thin films at higher temperatures using magnetron sputtering, it is possible to produce low-cost and CMOS-compatible layers with improved crystallinity. This method allows for the integration of optoelectronic and photonic devices based on Ge1-xSnx alloys in the CMOS technology, showing promise for future applications.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Physics, Applied
M. A. Khaled, D. C. Arnold, B. Dkhil, M. Jouiad, K. Hoummada, M. El Marssi, H. Bouyanfif
Summary: The use of nanoscale superlattices to design new anti-ferroelectric systems is an elegant strategy in the pursuit of high energy density capacitors. In-depth characterization of BiFeO3/NdFeO3 superlattices reveals that the stability of the anti-polar state within the superlattices is controlled by the thickness of the BiFeO3 layer and interlayer strain.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Adrien Fourmont, Sophie Le Gallet, Khalid Hoummada, Marion Descoins, Clara Desgranges, Olivier Politano, Florence Baras
Summary: AlCoCrFeNi High Entropy Alloys were synthesized through Planetary Ball Milling and Spark Plasma Sintering at 1100 degrees C, resulting in a unique dual-phase microstructure that was chemically homogeneous at the nanoscale. The presence of oxides could potentially alter the alloy's microstructure.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
P. Douguet, G. Da Rosa, P. Maugis, J. Drillet, K. Hoummada
Summary: The study demonstrates that boron segregation at austenite grain boundaries reduces the bainitic transformation rate and also affects the transformation rate based on austenite grain size. The developed kinetic model successfully explains the experimental data and confirms the influence of boron segregation on bainite nucleation.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
A. Portavoce, H. Khelidj, N. Oueldna, S. Amhil, M. Bertoglio, D. Mangelinck, L. Essaleh, K. Hoummada
Article
Microscopy
C. Gao, C. Hofer, T. J. Pennycook
Summary: Ptychography provides high dose efficiency images that can reveal light elements next to heavy atoms. However, contrast reversals can occur when the projected potential becomes strong. Recent research has shown that these reversals can be counteracted by adapting the focus. This study explains why the best contrast is often found with the probe focused to the middle of the sample and highlights the importance of convergence angle in thin samples to remove contrast reversals.
Article
Microscopy
J. Lindner, U. Ross, T. Meyer, V. Boureau, M. Seibt, Ch. Jooss
Summary: Phase-shifting electron holography is an excellent method with high phase sensitivity to reveal electron wave phase information. An advanced drift correction scheme is proposed in this study, which exploits the interface of the TEM specimen and the vacuum area in the hologram. This method allows for obtaining reliable phase information.
Article
Microscopy
Ali Jaberi, Nicolas Brodusch, Jun Song, Raynald Gauvin
Summary: This study investigates knock-on damage in lithium-ion batteries (LIBs) by computing threshold displacement energies (TDEs) and performing Monte Carlo simulation. The results indicate that Li is most sensitive to knock-on damage at moderate electron energies, and TDE is the principal parameter for assessing Li sensitivity to knock-on damage across similar structures.
Article
Microscopy
Alexander Schroeder, Christopher Rathje, Leon van Velzen, Maurits Kelder, Sascha Schaefer
Summary: This study utilizes novel event-based electron detector platforms to extend the temporal resolution of electron microscopy. By training a neural network to predict electron arrival time, the researchers were able to improve the timing accuracy and achieve a promising solution for enhancing electron timing precision in various electron microscopy applications.
Article
Microscopy
Avi Auslender, Nivedita Pandey, Amit Kohn, Oswaldo Dieguez
Summary: This article describes a faster implementation based on DFT for computing the mean inner potential of crystals, providing quantum-mechanical calculations beyond the independent-atom approximation. The study also reveals the dependence of the mean inner potential on sample boundary conditions, mass density, and magnetic susceptibility, highlighting its correlation with various material properties.
Article
Microscopy
Zhidong Yang, Dawei Zang, Hongjia Li, Zhao Zhang, Fa Zhang, Renmin Han
Summary: In this work, we propose a self-supervised deep learning model for cryo-ET volumetric image denoising based on noise modeling and sparsity guidance. Experimental results demonstrate that our method can achieve reliable denoising by training on single noisy volume and outperform existing methods.
Article
Microscopy
J. Kuttruff, J. Holder, Y. Meng, P. Baum
Summary: In this study, a robust clustering algorithm is proposed that can find clusters in a continuous stream of raw data in real time. This algorithm converts pixel hits measured by hybrid pixel detectors to real single-electron events. By continuously comparing with previous hits, the algorithm efficiently identifies the merging of new and old events.
Article
Microscopy
D. G. Senturk, C. P. Yu, A. De Backer, S. Van Aert
Summary: This article presents a statistics-based method for accurately counting the number of atoms in nanostructures, especially for images acquired with low electron doses and multiple element structures.
Article
Microscopy
Mauricio J. Prieto, Lucas de Souza Caldas, Liviu C. Tanase, Thomas Schmidt, Oscar Rodriguez de la Fuente
Summary: This study presents a synchrotron-based investigation of the synthesis process of a magnetite/hematite bilayer. Ion bombardment gradually transforms hematite into magnetite, and the growth of magnetite leads to the formation of stable boundaries. These findings are significant for understanding novel oxide heterostructures.
Article
Microscopy
Emre Yoruk, Holger Klein, Stephanie Kodjikian
Summary: Beam sensitive nanomaterials pose challenges for crystallographic structure determination. A dose symmetric electron diffraction tomography (DS-EDT) method is developed to reduce beam damage and obtain complete data sets by merging individual datasets from multiple crystals.
Article
Microscopy
A. Pofelski, Y. Zhu, G. A. Botton
Summary: The precision and sensitivity of the GPA method for strain characterization is a widely discussed topic. This study introduces the concept of phase noise and analyzes the parameter of sampling to improve the precision of GPA. Experimental and theoretical results demonstrate that using a larger pixel spacing in STEM can enhance the precision and sensitivity of the GPA method.
Article
Microscopy
Sangjun Kang, Di Wang, Christian Kuebel, Xiaoke Mu
Summary: Transmission electron microscopy is a valuable tool for assessing strain fields within materials. However, using thin specimens in TEM analysis can affect atomic configuration and deformation structure.
