Article
Metallurgy & Metallurgical Engineering
N. Harshavardhana, S. P. Sundar Singh Sivam, Gulshan Kumar, Ashish Kumar Saxena
Summary: In electron backscatter diffraction (EBSD), parameters like KAM, GAM, and GOS are compared to determine the extent of recrystallization in pure copper, with GOS found to be the most suitable parameter for distinguishing between strain-free and deformed grains. This study provides insights into achieving higher mechanical strength and electrical conductivity in pure copper through analyzing different parameters.
PHYSICS OF METALS AND METALLOGRAPHY
(2021)
Article
Chemistry, Physical
Abheepsit Raturi, Krishanu Biswas, N. P. Gurao
Summary: A comprehensive study was conducted to predict the elastic and plastic anisotropy of the non-equiatomic Mo15Nb35Ta35V5W10 Refractory High Entropy alloy (RHEA) using high throughput combinatorial approach and instrumented micro-indentation with electron backscatter diffraction (EBSD). The results indicate that the anisotropy in the elastoplastic behavior of the novel RHEA is distinct from its constituent elements, requiring high throughput experimental techniques to establish the structure-property linkages.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Felipe M. Carvalho, Dany Centeno, Gustavo Tressia, Julian A. Avila, Fabiano E. M. Cezario, Andres Marquez-Rossy, Edwan A. Ariza, Mohammad Masoumi
Summary: Novel quenching and partitioning (Q&P) processing were designed to deliver a complex and desirable nanostructured multicomponent microstructure in commercial carbon silicon spring steel, enhancing its mechanical properties with high ultimate tensile strength, yield strength, and good strain to fracture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Multidisciplinary
Jianxun Li, Minghang Wang, Haofeng Chen, Pengfei Wang, Weiqiang Wang
Summary: In this study, the tensile damage in stainless steel 316L was evaluated using the nonlinear ultrasonic Lamb wave method. The effect of tensile deformation on the nonlinear ultrasonic response was analyzed, and it was found that the nonlinearity was controlled by the microstructure evolution. A method based on continuous damage mechanics was proposed to quantify the degradation of mechanical properties.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Review
Metallurgy & Metallurgical Engineering
Vinicius dos Santos Dagostini, Ariane Neves de Moura, Temistocles de Sousa Luz, Nicolau Apoena Castro, Marcos Tadeu D'Azeredo Orlando, Estefano Aparecido Vieira
Summary: This study investigated the heat-affected zone (HAZ) behavior in API 5L X70 steel welded by the gas metal arc welding process (GMAW), revealing changes in microstructures and properties under different heat inputs. The presence of low-angle grain boundaries was found to enhance fracture toughness in the HAZ, with a heat input of 3.0 kJ/mm showing characteristics similar to the base metal.
WELDING IN THE WORLD
(2021)
Article
Materials Science, Multidisciplinary
Qianqian Zhu, Lingfei Cao, Yahui Liu, Shifeng Liu, Xiaodong Wu
Summary: Compression experiments were conducted to study the intergranular deformation behaviors of 7xxx aluminum alloy at a micro-scale. The results showed that dislocation slips could be transmitted between some pairs of adjacent deformed grains, influenced by factors such as the Schmid factor and the degree of strain concentration between grains.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Shogo Oda, Shun-Ichiro Tanaka
Summary: The bending properties of 6000 series Al alloys are influenced by various factors, including precipitates, shear band generation, preferred orientation, and residual stress distribution. The energetic stability of grain boundaries and grain matrix plays a crucial role in crack initiation mechanisms, with unstable grain boundaries with a large Sigma value being more prone to cracking.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jinkui Meng, Xiangguang Chen, Jiantang Jiang, Li Liu
Summary: The anisotropic behavior of the Ti-6Al-4V alloy was investigated through tensile tests along different directions. It was found that samples tensioned along the rolling direction and transverse direction showed similar yield strength, while samples tensioned along the diagonal direction had lower yield strength. The anisotropy of the Ti-6Al-4V sheet is closely related to its crystallographic texture.
Article
Materials Science, Multidisciplinary
M. A. Mohtadi-Bonab, Edwan A. Ariza, Rodrigo C. P. Loureiro, Dany Centeno, Felipe M. Carvalho, Julian A. Avila, Mohammad Masoumi
Summary: A complex microstructure and crystallographic data were developed through quenching and partitioning (Q&P) process to improve the tensile properties of commercial pearlitic carbon-silicon steel. The two-stage Q&P process produced a microstructure composed of tempered martensite, bainite, ultrafine carbides/martensite-austenite/retained austenite particles. Electron microscopy and X-ray diffraction techniques were used to investigate the microstructure and crystallographic data. Hardness and tensile properties were evaluated to confirm the improvement in mechanical properties. The presence of nano-carbide particles inside athermal martensite and the formation of preferential atomic-compact < 111 > direction in BCC plates were observed. The development of nanoscale carbide dispersed in refined bainite/martensite matrix significantly increased the yield and ultimate tensile strength, but reduced ductility compared to the initial microstructure.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Emilio Bassini, Giulio Marchese, Antonio Sivo, Pietro Antonio Martelli, Alessio Gullino, Daniele Ugues
Summary: A new advanced dual-phase steel with equal fractions of ferrite and bainite was investigated in this study. The anisotropy change of the steel was evaluated during a cold rolling process, which progressively increased the thinning level. Tensile tests were conducted to construct a strain-hardening curve that described the evolution of the steel's mechanical properties. The microstructure and mechanical assessment revealed that the steel became isotropic after 50% strain hardening. The paper also assessed the forming limit of the steel and introduced geometric limitations to testing the mechanical properties of thin steel plates.
Article
Materials Science, Multidisciplinary
Marcos Natan da Silva Lima, Samuel Filgueiras Rodrigues, Majid Al-Maharbi, Jessica Calvo Munoz, Jose Maria Cabrera Marrero, Hamilton Ferreira Gomes de Abreu
Summary: The development of microstructure and texture of TWIP steel sheet during ECAP at different temperatures were studied, and the effect of temperature during the severe plastic deformation process was compared. The results showed that the volume fraction of twins, dislocation density, and yield strength increased while ductility decreased after ECAP. The best balance between high strength and good ductility was achieved after four passes at 250 degrees C and 350 degrees C.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Multidisciplinary
Jasper Ramon, Ritwik Basu, George Vander Voort, Gururaj Bolar
Summary: The study evaluated solidification cracks in stainless steel welds on a laboratory scale using detailed EBSD investigation. It found a near-linear relationship between welding speed and cracking susceptibility. The cracks were predominantly transgranular type and propagated through grains with lower Taylor factors, with a correlation between in-grain misorientation and crack sensitivity.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Materials Science, Multidisciplinary
Moussa Bouchedjra, Abdelwaheb Amrouche, Toufik Kanit, Mohamed El Amine Belouchrani
Summary: The study investigates the influence of microstructural characteristics of polycrystalline metals on the evolution of the damage process, using quaternion theory to represent the orientation of each grain and numerical homogenization to calculate the damage evolution and its distribution on each grain. The results show that neighboring grains effects are larger and may change the tendency that larger grains with great misorientation are the most damaged.
INTERNATIONAL JOURNAL OF DAMAGE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Xu Zhang, Songjiang Lu, Bo Zhang, Xiaobao Tian, Qianhua Kan, Guozheng Kang
Summary: This article investigates a generalized dislocation-GB interaction model and its application in nanopillars and bicrystals within a three-dimensional multiscale discrete dislocation dynamics framework. It is found that the mechanical responses of bicrystals are influenced by the GB structures and complex dislocation interactions. Furthermore, the specific events of dislocation absorption and emission, as well as the evolution of resolved shear stress and dislocation density, are found to be independent of GB misorientation angles or GB strength.
Article
Materials Science, Multidisciplinary
Atul Kumar, Lambodar Sahoo, Deepak Kumar, Vajinder Singh, K. Gopinath, R. Balamuralikrishnan
Summary: High-strength low-alloy (HSLA) steels are important for critical engineering applications, and understanding the phases that occur during their decomposition is vital for optimizing processing parameters. Continuous cooling transformation diagrams provide valuable information about cooling transformations and can be constructed from dilatometry experiments. However, distinguishing between martensite and bainite, which often make up the microstructure of low-carbon HSLA steels, can be challenging. Advanced data processing techniques using electron backscattered diffraction (EBSD) have shown success in differentiating between these two phases.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
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.