Article
Chemistry, Physical
Andrea Mizelli-Ojdanic, Jelena Horky, Bernhard Mingler, Mattia Fanetti, Sandra Gardonio, Matjaz Valant, Bartosz Sulkowski, Erhard Schafler, Dmytro Orlov, Michael J. Zehetbauer
Summary: This study analyzed several biodegradable Mg alloys through high-pressure torsion and elevated temperature heat treatments, revealing significant strength increases from various factors including dynamic recovery for improved ductility. The study also showed that the initial values of Young's modulus and corrosion resistance were largely unaffected by the processing routes, indicating a viable method for optimizing Mg alloys for enhanced mechanical properties while maintaining corrosion properties.
Article
Materials Science, Multidisciplinary
H. T. Jeong, W. J. Kim
Summary: In this study, a high-entropy alloy was cold rolled using the differential speed rolling technique, and it was found that increasing the speed ratio led to improved microstructure and tensile properties.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Yucheng Zhou, Qun Luo, Bin Jiang, Qian Li, Fusheng Pan
Summary: A new Mg98.3Y1.3Ni0.4 alloy with good strength-ductility synergy, high ultimate tensile strength, and low work hardening rate has been prepared through high temperature homogenization and rolling. The strength increment in the alloy is attributed to refined grains, broken LPSO phases, and high-density geometrically necessary dislocations. The good ductility and low work hardening rate are due to weak basal texture, activation of non-basal slips with high Schmid factors, and annihilation of high-density dislocations.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Physical
Anna Dobkowska, Aleksandra Zielinska, Irena Paulin, Crtomir Donik, Maciej Lojkowski, Milena Koralnik, Boguslawa Adamczyk-Cieslak, Krystian Paradowski, Marek Tkocz, Dariusz Kuc, Jiri Kubasek, Matjaz Godec, Wojciech Swieszkowski
Summary: We investigated the microstructure, mechanical, and corrosion properties of an AZ61 alloy extruded using the KoBo method. The KoBo method enables extrusion of AZ61 without preheating and results in significant microstructure refinement. However, this study found that it did not enhance the strength or corrosion resistance of the AZ61 alloy. The continuously precipitated Mg17Al12 phase along the grain boundaries was identified as the main factor affecting the alloy's properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Martin Fibela-Esparza, Armando Salinas-Rodriguez, Juan Mendez-Nonell, Jose Martin Herrera-Ramirez, Yoshikazu Todaka, Jose Gerardo Cabanas-Moreno
Summary: A Mg-based composite material was produced by high-pressure torsion (HPT) consolidation. Differences were observed in density and microhardness measurements between the center and the periphery. Surface contamination of the Mg powders did not prevent full consolidation of the material.
Review
Materials Science, Multidisciplinary
Natalia Kudriashova, Jacques Huot
Summary: This paper reviews the enhancement of magnesium-based alloys through cold rolling. The technique is briefly described, and the main alloy systems investigated in recent years are discussed.
MATERIALS TRANSACTIONS
(2023)
Article
Nanoscience & Nanotechnology
Yu Gamin, Jairo Alberto Munoz Bolanos, A. S. Aleschenko, A. A. Komissarov, N. S. Bunits, D. A. Nikolaev, A. Fomin, V. V. Cheverikin
Summary: The semi-finished products from a Cu-Ni-Cr-Si alloy are produced for electrical purposes through radial-shear rolling (RSR) and heat treatment, resulting in improved mechanical properties and electrical conductivity. The alloy is thermally hardened after heat treatment due to the precipitation of fine inclusions uniformly distributed in the sample volume, leading to enhanced mechanical properties and electrical conductivity.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Review
Materials Science, Multidisciplinary
Hamed Mirzadeh
Summary: This monograph provides an overview of friction stir processing (FSP) of surface metal-matrix composites (MMCs) using AZ91 magnesium alloy, summarizing the results related to various reinforcing particles and explaining the AZ91 composite fabricating methods based on FSP. The effects of introducing second-phase particles and FSP process parameters on the microstructural modification, mechanical properties, wear/tribological behavior, and corrosion resistance are discussed. Furthermore, suggestions for future work, such as focusing on superplasticity, metal additive manufacturing processes, and common reinforcing phases, are proposed.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Mariana P. Medeiros, Amanda P. Carvalho, Augusta Isaac, Conrado R. M. Afonso, Milos Janecek, Peter Minarik, Mayerling Martinez Celis, Roberto B. Figueiredo
Summary: The effect of high pressure torsion processing on the mechanical properties and corrosion behavior of various magnesium alloys was studied. Severe plastic deformation processing improved the strength of all alloys, but deformation localization occurred in the Mg-Zn-Ca and Mg-Y-RE alloys. Pure magnesium, Mg-Zn, and Mg-Li-Y alloys exhibited good corrosion resistance with low corrosion rates and maintained integrity after 28 days of immersion.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Sang Yong Park, Woo Jin Kim
Summary: The HRDSR processing of niobium results in more effective grain refinement through continuous dynamic recrystallization, with a preference for recrystallization on {111} γ-fiber grains. The HRDSR-processed samples exhibit high tensile strength, with the major strengthening mechanism being dislocation-density strengthening.
Article
Engineering, Mechanical
Maruff Hussain, Kamal Sharma, Kahtan A. Mohammed, Nikhil Kumar
Summary: In this study, cross cryo-rolling was used to produce ultrafine grained Al alloy. The mechanical properties of the alloy were improved by the cross rolling, with increased strength and ductility compared to room temperature rolling. Microstructural analysis revealed the formation of heavily deformed sub-grains and dislocation tangles, contributing to the improved strength.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Abbas Mohammadi, Marc Novelli, Makoto Arita, Jae Wung Bae, Hyoung Seop Kim, Thierry Grosdidier, Kaveh Edalati
Summary: High-strength materials often lack resistance to hydrogen embrittlement. In this study, gradient structures with surface nanotwins were introduced in a high-entropy alloy, resulting in materials with both high strength and good ductility under hydrogen. This research is significant for the development of hydrogen-resistant materials.
Review
Metallurgy & Metallurgical Engineering
M. Kasaeian-Naeini, M. Sedighi, R. Hashemi
Summary: This paper summarizes the use of severe plastic deformation (SPD) techniques to achieve an ultrafine-grained (UFG) structure in magnesium alloys and composites. The effects of various SPD methods on magnesium microstructure, mechanical properties, and corrosion behavior are discussed.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Materials Science, Multidisciplinary
Koji Hagihara, Ryohei Ueyama, Toko Tokunaga, Michiaki Yamasaki, Yoshihito Kawamura, Takayoshi Nakano
Summary: This study quantitatively evaluated the kink-band strengthening using a Mg-Zn-Y single crystal, revealing the origin of the anomalous ability of kink bands acting as barriers to dislocation motion. The high ability of a kink-band boundary to hinder dislocation motion is attributed to its peculiar hierarchical structure, where many small kink bands with high crystal rotation angles accumulate in a localized region.
MATERIALS RESEARCH LETTERS
(2021)
Article
Engineering, Mechanical
Hao Wu, Meng Huang, Xuewen Li, Yiping Xia, Zhi Wang, Guohua Fan
Summary: The study proposed a new heterogeneous laminated/gradient integrated strategy to improve material performance. Results demonstrated that the stress-bearing constituents gradually transition from Ti(Al) to TiBw/Ti layers as the temperature decreases, leading to temperature-dependent reversed fracture behavior.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Materials Science, Multidisciplinary
J. Y. Yang, W. J. Kim
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2020)
Article
Materials Science, Multidisciplinary
J. Y. Yang, W. J. Kim
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2020)
Article
Chemistry, Physical
H. T. Jeong, H. K. Park, H. S. Kang, W. J. Kim
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Materials Science, Multidisciplinary
W. J. Kim, H. T. Jeong
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2020)
Article
Materials Science, Multidisciplinary
J. Y. Yang, G. H. Kim, W. J. Kim
MATERIALS CHARACTERIZATION
(2020)
Article
Metallurgy & Metallurgical Engineering
T. J. Lee, W. J. Kim
JOURNAL OF MAGNESIUM AND ALLOYS
(2020)
Article
Nanoscience & Nanotechnology
H. T. Jeong, W. J. Kim
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Review
Chemistry, Physical
Ahmad Bahmani, Woo-Jin Kim
Article
Engineering, Civil
Eunsoo Choi, Alireza Ostadrahimi, Woo Jin Kim, Junwon Seo
Summary: This study investigates the stress recovery effect induced in Fe-based SMA and the prestressing effect of embedded Fe-SMA wires on the flexural behavior of mortar beams. By conducting three-point bending tests under prestressing force, the bending stress in Fe-SMA reinforced specimens is analyzed, leading to the discovery that prestressing force can significantly increase fracture deformation capacity and reduce stress in mortar beams.
ENGINEERING STRUCTURES
(2021)
Article
Nanoscience & Nanotechnology
H. T. Jeong, H. K. Park, W. J. Kim
Summary: The hot compressive deformation behavior of a cast Sn0.5CoCrFeMnNi high-entropy alloy revealed that the MnNiSn-rich ordered FCC phase exhibited a significantly higher degree of dynamic recrystallization compared to the FCC solid solution phase. Continuous dynamic recrystallization was only pronounced in the FCC solid solution phase at the highest temperature of 1248 K.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
H. T. Jeong, W. J. Kim
Summary: The high strength and high uniform strain of Al0.5CoCrFeMnNi alloy were achieved by severe plastic deformation via high-ratio differential speed rolling (HRDSR) followed by an annealing treatment. The optimized microstructure with ultrafine-grained FCC matrix and BCC particles allowed for a high tensile strength of over 1 GPa with a good uniform elongation of 14%-20%.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Physical
Sang Yong Park, Woo Jin Kim
Summary: The HRDSR processing of niobium results in more effective grain refinement through continuous dynamic recrystallization, with a preference for recrystallization on {111} γ-fiber grains. The HRDSR-processed samples exhibit high tensile strength, with the major strengthening mechanism being dislocation-density strengthening.
Review
Chemistry, Physical
Hee-Tae Jeong, Woo Jin Kim
Summary: This review paper analyzes the hot compressive deformation mechanisms and processing maps of high-entropy alloys (HEAs) with different compositions and structures. The stress exponent (n1) values measured from compression tests at various temperatures and strain rates show a distribution between 3 and 35, with the most common values between 3 and 7. Al behaves as a solute atom that hinders dislocation slip motion at high temperatures, as evidenced by the decrease in n1 with increasing Al concentration in AlxCrMnFeCoNi (x = 0-1) and AlxCrFeCoNi (x = 0-1) HEAs. The activation energy for plastic flow (Qc) values for the HEAs are mostly in the range of 300-400 kJ/mol, similar to the activation energy for tracer diffusivity of elements in the HEAs. The power dissipation efficiency (η) of the HEAs follows a single equation uniquely related to n1. Flow instability in the HEAs occurs near n1 = 7, indicating the transition from power law creep to power law breakdown. The processing maps of the HEAs can be represented by plotting η as a function of the Zener-Hollomon parameter (Z = exp(QcRT)).
Article
Chemistry, Physical
Tae-Jin Lee, Woo-Jin Kim
Summary: Severe plastic deformation and short annealing treatment result in a partially recrystallized microstructure with small grain size in Ni-rich Ti-50.8Ni alloy. Aging treatment leads to the formation of R phase as the major phase, which contributes to excellent superelasticity and superelastic cyclability. The achievement is attributed to grain refinement, particle strengthening, and reduced critical stress for stress-induced martensite transformation due to the presence of R phase.
Article
Materials Science, Multidisciplinary
S. H. Han, W. J. Kim
MATERIALS CHARACTERIZATION
(2020)
Article
Nanoscience & Nanotechnology
Jie Zhang, Xiaoyang Chen, MingJian Ding, Jiaqiang Chen, Ping Yu
Summary: This study enhances the compositional inhomogeneity of relaxor ferroelectric thin films to improve their dielectric temperature stability. The prepared films exhibit a relatively high dielectric constant and a very low variation ratio of dielectric constant over a wide temperature range.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xiaoyu Chen, Ranran Zhang, Hao Zou, Ling Li, Qiancheng Zhu, Wenming Zhang
Summary: Polyaniline-manganese dioxide composites exhibit high conductivity, long discharge platform, and stable circulation, and the specific capacity is increased by providing additional H+ ions to participate in the reaction.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xutao Huang, Yinping Chen, Jianjun Wang, Gang Lu, Wenxin Wang, Zan Yao, Sixin Zhao, Yujie Liu, Qian Li
Summary: This study aims to establish a novel approach to better understand and predict the behavior of materials with multi-scale lamellar microstructures. High-resolution reconstruction and collaborative characterization methods are used to accurately represent the microstructure. The mechanical properties of pearlite are investigated using crystal plasticity simulation and in-situ scanning electron microscopy tensile testing. The results validate the reliability of the novel strategy.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Cheng Chen, Fanchao Meng, Jun Song
Summary: This study systematically investigated the unfaulting mechanism of single-layer interstitial dislocation loops in irradiated L12-Ni3Al. The unfaulting routes of the loops were uncovered and the symmetry breaking during the unfaulting processes was further elucidated. A continuum model was formulated to analyze the energetics of the loops and predict the unfaulting threshold.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Darshan Bamney, Laurent Capolungo
Summary: This work investigates the formation of adjoining twin pairs (ATPs) at grain boundaries (GBs) in hexagonal close-packed (hcp) metals, focusing on the co-nucleation (CN) of pairs of deformation twins. A continuum defect mechanics model is proposed to study the energetic feasibility of CN of ATPs resulting from GB dislocation dissociation. The model reveals that CN is preferred over the nucleation of a single twin variant for low misorientation angle GBs. Further analysis considering GB character and twin system alignment suggests that CN events could be responsible for ATP formation even at low m' values.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Bing Han, Zhengqian Fu, Guoxiang Zhao, Xuefeng Chen, Genshui Wang, Fangfang Xu
Summary: This study investigates the behavior of electric-field induced antiferroelectric to ferroelectric (AFE-FE) phase transition and reveals the evolution of atomic displacement ordering as the cause for the transition behavior changing from sharp to diffuse. The novel semi-ordered configuration results from the competing interaction between long-range displacement modulation and compositional inhomogeneity, which leads to a diffuse AFE-FE transition while maintaining the switching field.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Akib Jabed, Golden Kumar
Summary: This study demonstrates that cryogenic rejuvenation promotes homogeneous-like flow and increases ductility in metallic glass samples. Conversely, annealing has the opposite effect, resulting in a smoother fracture surface.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Xin Ji, Yan Chong, Satoshi Emura, Koichi Tsuchiya
Summary: A heterogeneous microstructure in Ti-15Mo-3Al alloy with heterogeneous distributions of Mo element and omega(iso) precipitates has achieved a four-fold increase in tensile ductility without a loss of tensile strength, by blocking the propagation of dislocation channels and preventing the formation of micro-cracks.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Amit Samanta, Prasanna Balaprakash, Sylvie Aubry, Brian K. Lin
Summary: This study proposes a combined large-scale first principles approach with machine learning and materials informatics to quickly explore the chemistry-composition space of advanced high strength steels (AHSS). The distribution of aluminum and manganese atoms in iron is systematically explored using first principles calculations to investigate low stacking fault energy configurations. The use of an automated machine learning tool, DeepHyper, speeds up the computational process. The study provides insights into the distribution of aluminum and manganese atoms in systems containing stacking faults and their effects on the equilibrium distribution.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Guowei Zhou, Yuanzhe Hu, Zizheng Cao, Myoung Gyu Lee, Dayong Li
Summary: In this work, a physics-constrained neural network is used to predict grain-level responses in FCC material by incorporating crystal plasticity theory. The key feature, shear strain rate of slip system, is identified based on crystal plasticity and incorporated into the loss function as physical constitutive equations. The introduction of physics constraints accelerates the convergence of the neural network model and improves prediction accuracy, especially for small-scale datasets. Transfer learning is performed to capture complex in-plane deformation of crystals with any initial orientations, including cyclic loading and arbitrary non-monotonic loading.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Pengfei Yang, Qichang Li, Zhongying Wang, Yuxiao Gao, Wei Jin, Weiping Xiao, Lei Wang, Fusheng Liu, Zexing Wu
Summary: In this study, the HER performance of Ru-based catalysts is significantly improved through the dual-doping strategy. The obtained catalyst exhibits excellent performance in alkaline freshwater and alkaline seawater, and can be stably operated in a self-assembled overall water splitting electrolyzer.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Ilias Bikmukhametov, Garritt J. Tucker, Gregory B. Thompson
Summary: Depositing a Ni-1at. % P film can facilitate the formation of multiple quintuple twin junctions, resulting in a five-fold twin structure and a pentagonal pyramid surface topology. The ability to control material structures offers opportunities for creating novel surface topologies, which can be used as arrays of field emitters or textured surfaces.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Zening Yang, Weiwei Sun, Zhengyu Sun, Mutian Zhang, Jin Yu, Yubin Wen
Summary: Multicomponent oxides (MCOs) have wide applications and accurately predicting their thermal expansion remains challenging. This study introduces an innovative attention-based deep learning model, which achieves improved performance by using two self-attention modules and demonstrates adaptability and interpretability.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Ze Liu, Cai Chen, Yuanxun Zhou, Lanting Zhang, Hong Wang
Summary: This study attempts to address the gap in cooling rates between thin film deposition and bulk metallic glass (BMG) casting by correlating the glass-forming range (GFR) determined from combinatorial materials chips (CMCs) with the glass-forming ability (GFA) of BMG. The results show that the full-width at half maximum (FWHM) of the first sharp diffraction peak (FSDP) is a good indicator of BMG GFA, and strong positive correlations between FWHM and the critical casting diameter (Dmax) are observed in various BMG systems. Furthermore, the Pearson correlation coefficients suggest possible similarities in the GFA natures of certain BMG pairs.
SCRIPTA MATERIALIA
(2024)
Article
Nanoscience & Nanotechnology
Mike Schneider, Jean-Philippe Couzinie, Amin Shalabi, Farhad Ibrahimkhel, Alberto Ferrari, Fritz Koermann, Guillaume Laplanche
Summary: This work aims to predict the microstructure of recrystallized medium and high-entropy alloys, particularly the density and thickness of annealing twins. Through experiments and simulations, a database is provided for twin boundary engineering in alloy development. The results also support existing theories and empirical relationships.
SCRIPTA MATERIALIA
(2024)
