Article
Materials Science, Multidisciplinary
Aimo Winkelmann, Grzegorz Cios, Tomasz Tokarski, Piotr Bala, Yuri Grin, Ulrich Burkhardt
Summary: This paper investigates the effects of crystal structures of manganese, tellurium, and selenium elements on chirality, and resolves the presence of two physically different variants in crystallographic analyses. The study demonstrates the sensitivity of dynamical Kikuchi diffraction in scanning electron microscope to the local sense of chirality in crystals of single chemical elements.
MATERIALS CHARACTERIZATION
(2023)
Article
Materials Science, Multidisciplinary
Alec I. Saville, Amy J. Clarke
Summary: This study introduces a reconstruction process to evaluate the microstructural evolution of the high temperature fl-Ti phase in a Ti-Cu binary alloy. While the reconstruction of martensitic microstructures was successful, the reconstruction of pearlitic microstructures was not effective. However, this analysis provided new insights into the interfacial crystallographic orientations of pearlitic Ti-Cu microstructures.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
M. Myshlyaev, G. Korznikova, T. Konkova, E. Korznikova, A. Aletdinov, G. Khalikova, G. Raab, S. Mironov
Summary: In this study, the advanced capabilities of electron backscatter diffraction (EBSD) were used to investigate the role of dynamic recrystallization in the superplastic deformation of a fine-grained material. The results showed that dynamic recrystallization occurred only locally and had a minor contribution to microstructural evolution. Therefore, the preservation of the nearly-equiaxed grain morphology associated with superplasticity cannot be attributed to dynamic recrystallization.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Microscopy
Caleb E. Andrews, Maria Strantza, Nicholas P. Calta, Manyalibo J. Matthews, Mitra L. Taheri
Summary: The rapid collection and indexing of electron diffraction patterns via electron backscatter diffraction (EBSD) has enabled crystallographic orientation and structural determination, as well as strain and dislocation density information. However, EBSD acquisition is sensitive to many factors and can result in low confidence index, poor image quality, and improper fit minimization, leading to noisy datasets and misrepresented microstructure. To address this, an image denoising autoencoder was implemented, resulting in improved pattern quality and accuracy of fit. The use of denoised datasets in HR-EBSD cross correlative strain analysis further reduced phantom strain and improved indexing accuracy.
Article
Microscopy
Aimo Winkelmann, Gert Nolze, Grzegorz Cios, Tomasz Tokarski, Piotr Bala, Ben Hourahine, Carol Trager-Cowan
Summary: The study proposes a refined simulation approach to accurately model various features observed in experimental Kikuchi diffraction patterns, particularly the excess-deficiency features seen in transmission Kikuchi diffraction. It is found that neglecting excess-deficiency effects in the theoretical model can impact the accuracy of projection center coordinates in electron backscatter diffraction and transmission Kikuchi diffraction by an order of magnitude around 10-3-10-2, affecting the absolute accuracy of simulation-based EBSD strain determination.
JOURNAL OF MICROSCOPY
(2021)
Article
Materials Science, Multidisciplinary
Baptiste Gault, Heena Khanchandani, Thoudden Sukumar Prithiv, Stoichko Antonov, T. Ben Britton
Summary: Measuring local chemistry of specific crystallographic features by atom probe tomography (APT) is aided by transmission Kikuchi diffraction (TKD), but the potential structural damage caused by TKD is often ignored. Two case studies demonstrate damage in APT specimens from TKD mapping. The damage includes planar segregation of solutes and the formation of voids containing high concentrations of a specific element.
MICROSCOPY AND MICROANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
Huijun Cao, Yu Zhang, Yinggan Zhang, Jiajia Han, Dongchuan Su, Zhihao Zhang
Summary: The miniaturization trend of three-dimensional integrated circuits presents challenges to solder reliability. This study comprehensively explores the solder evolution under high current stressing, considering the anisotropic characteristics of beta-Sn. The results reveal that the anisotropy of beta-Sn aggravates the nonuniform distribution of current-induced stresses, leading to multiple migration modes in the solder bump. Additionally, electron-dislocation interaction promotes dislocation slip and lattice rotation, and current-induced grain merging via detwinning is observed. The study contributes to a better understanding of anisotropic evolution and damage mechanisms in micro solder bump design under current stressing.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Physical
Mikhail Myshlyaev, Sergey Mironov, Galia Korznikova, Tatyana Konkova, Elena Korznikova, Ainur Aletdinov, Gulnara Khalikova, George Raab, Sheldon Lee Semiatin
Summary: The application of Electron backscatter diffraction (EBSD) revealed that microstructural changes in a fine-grain Al-Mg-Li alloy during superplastic behavior were significantly influenced by continuous dynamic recrystallization. This mechanism involved the transverse subdivision of pre-elongated grains transforming into chains of nearly-equiaxed grains. Experimental observations, including significant strain hardening, grain elongation, and the development of crystallographic texture, provided strong evidence of intragranular slip operating during superplastic flow.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
K. Sai Jyotheender, M. K. Punith Kumar, Chandan Srivastava
Summary: Electrogalvanization at room temperature using aqueous bath is widely used to protect steel in highly corrosive environments. However, low temperature galvanization at -2 degrees C produces Zn coating with significantly lower corrosion current density, leading to higher corrosion resistance compared to coatings deposited at higher temperatures. The texture of the coatings is highly sensitive to the deposition temperature, with coatings deposited at 2 degrees C showing the highest corrosion resistance due to specific grain orientation and grain boundary constitution.
APPLIED SURFACE SCIENCE
(2021)
Article
Microscopy
Yitian Shen, Yongsheng Zhang, Wei Li, Hong Miao, Yongzhe Wang, Yi Zeng
Summary: This paper introduces a novel local band detection method for accurately extracting Kikuchi bands in low-quality patterns, improving indexing accuracy. The proposed method reduces the average interplanar angle error by approximately 29.0% and decreases the mean angular deviation by about 38.5% compared to the Hough transform-based technique.
JOURNAL OF MICROSCOPY
(2021)
Article
Materials Science, Multidisciplinary
C. Haug, D. Molodov, P. Gumbsch, C. Greiner
Summary: Tribological loading induces microstructural changes in metals through dislocation-mediated plastic deformation. Crystal lattice rotations play an important role in friction and wear at the sliding interface, and are influenced by sliding direction and grain orientation.
Article
Chemistry, Multidisciplinary
Peter D. B. Fischer, Stefan Martin, Alexander Walnsch, Martin Thuemmler, Mario J. Kriegel, Andreas Leineweber
Summary: Iron-based Fe-Mn-Al-Ni shape-memory alloys are cost-effective materials with remarkable pseudoelastic properties. The martensitic transformation of these alloys, studied through heat treatment and quenching, reveals a complex structure described by nanoscale twinned structure with tetragonal distortion. The lack of interstitial elements does not prevent the presence of these features.
JOURNAL OF APPLIED CRYSTALLOGRAPHY
(2021)
Article
Materials Science, Coatings & Films
K. Sai Jyotheender, M. K. Punith Kumar, Chandan Srivastava
Summary: Based on electrochemical experiments, Zn coatings with CTAB surfactant exhibited the highest corrosion resistance, while surfactant-free coatings showed the lowest corrosion resistance. The type of surfactant used also influenced the grain size and grain boundary constitution of the coatings.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Microscopy
Yuexing Han, Ruiqi Li, Yi Zeng, Mengyang Liu
Summary: The study proposes a method to automatically obtain the locations and intersections of Kikuchi bands in EBSD patterns, using Radon transform and progressive probabilistic Hough transform to detect straight lines and line segments. Experimental results demonstrate that the method is robust and can detect more accurate Kikuchi bands and intersections.
JOURNAL OF MICROSCOPY
(2022)
Article
Materials Science, Multidisciplinary
Fanbo Meng, Sheng Huang, Kwang Boon Lau, You Zhou, Yuheng Deng, Pei Wang, Xiaojun Shen, Christopher H. T. Lee
Summary: In this study, near grain-oriented and near non-oriented Fe-3.5 wt.%Si silicon steel were fabricated using LPBF, and the effects of processing parameters on the texture evolution and magnetic properties of the silicon steel were investigated. The results showed that the morphology of the molten pool and the grain orientations can be controlled by adjusting the linear energy density, laser power, and scanning speed. This study provides valuable insights into the relationship between processing parameters, texture evolution, and magnetic properties in LPBFed silicon steel.
MATERIALS & DESIGN
(2023)
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.
