Article
Materials Science, Multidisciplinary
Yin Zhang, Kunqing Ding, Sandra Stangebye, Dengke Chen, Josh Kacher, Olivier Pierron, Ting Zhu
Summary: Dislocation nucleation plays a crucial role in the plastic deformation of crystalline materials. However, accurately predicting the mode and rate of dislocation nucleation under typical experimental loading conditions through molecular dynamics simulation is challenging due to timescale limitations. In this study, the researchers used the free-end nudged elastic band method to determine the activation energies and activation volumes of dislocation nucleation in four typical face-centered cubic metals. Their focus was on surface and grain boundary dislocation nucleation processes. The atomistically determined activation volumes of these processes were found to be larger than 10b(3) under typical experimental loading conditions. The results were then compared with experimentally measured activation volumes in ultrafine-grained and nanocrystalline metals, providing mechanistic insight into their rate-controlling deformation mechanisms.
Article
Materials Science, Multidisciplinary
Sayantan Mondal, Amlan Dutta
Summary: This study presents a strategy based on Bayesian optimization to produce simulated nanocrystalline samples by minimizing the relative error between the computed and targeted grain boundary energy. Analysis of the optimized samples reveals that an increase in the average grain boundary energy primarily results from an increase in the fractions of grain boundary atoms with very low and very high free volumes.
Article
Chemistry, Physical
Lei Zhang, Gabor Csanyi, Erik van der Giessen, Francesco Maresca
Summary: Predicting atomistic fracture mechanisms in bcc iron is crucial for understanding its semi-brittle nature. By using a Gaussian approximation potential, we developed a model that accurately predicts critical stress intensity factors for different crack systems. Simulations revealed the mechanism of fracture along the original crack plane for {100} and {110} crack planes.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
I. Chesser, R. K. Koju, A. Vellore, Y. Mishin
Summary: Atomistic computer simulations are used to investigate the atomic structure, thermal stability, and diffusion processes at the Al-Si interphase boundaries in composite materials. It is found that some stable orientation relationships observed in epitaxy experiments also exist at these interfaces. An interface-induced recrystallization mechanism can transform non-equilibrium interfaces into more stable states. Diffusion of Al and Si atoms in stable Al-Si interfaces is slower compared to diffusion in Al grain boundaries but can be accelerated in the presence of interface disconnections. A qualitative explanation for the sluggish interphase boundary diffusion is proposed, involving correlated atomic rearrangements in the form of strings and rings of collectively moving atoms.
Article
Materials Science, Multidisciplinary
Hong He, Shangyi Ma, Shaoqing Wang
Summary: This study systematically investigated the <110> symmetric tilt grain boundaries (STGBs) in tungsten with different atomic densities and temperatures. It was found that STGBs with high Grin Boundary Energy (GBE) are poor sinks for interstitials, while those with low GBE are strong sinks. High temperature can promote the formation of GB complexions with local hexagonal or cubic structures, reducing the GBEs of certain STGBs. Additionally, a new analysis method based on effective interstice stacking was proposed to assess the interstitial absorption capacity of the STGBs.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Yang Su, Thanh Phan, Liming Xiong, Josh Kacher
Summary: This paper combines in situ high-resolution electron backscattered diffraction (EBSD) with concurrent atomistic-continuum (CAC) simulations to investigate the interactions between dislocation-mediated slip and grain boundaries (GBs) in Ni. The study shows that the local stress at slip-GB intersections initially increases with the pileup of dislocations and remains high, even after the nucleation of dislocations in the neighboring grain. The local stress only relaxes when the nucleated dislocations propagate away from the GB due to more incoming dislocations participating in the pileup. The relaxation of local stress is accompanied by the reconfiguration of atomic-scale GB structure, which not only affects subsequent dislocation transmission but also the configuration of dislocations away from the GB. These findings highlight the importance of incorporating local stress history in higher length scale models, such as crystal plasticity finite element.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Risheng Pei, Zhuocheng Xie, Sangbong Yi, Sandra Korte-Kerzel, Julien Guenole, Talal Al-Samman
Summary: Solute segregation at grain boundaries in magnesium alloys with multiple substitutional elements has a strong impact on various material characteristics. This study investigates the compositional inhomogeneity of six different grain boundaries using experimental and simulation techniques. The results reveal that the solute concentration of Nd in Mg varies between 2 and 5 at.%, and this variation is observed for different grain boundary orientations and within the grain boundary plane. Correlated atomistic simulations suggest that this inhomogeneous segregation behavior is caused by local atomic rearrangements within the grain boundaries.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Kaoru Nakamura, Tomohisa Kumagai, Toshiharu Ohnuma
Summary: We investigated the effects of temperature and tilt angle on the shear deformation behavior at a body centered cubic (bcc)-Fe grain boundary using classical molecular dynamics simulations. The results showed that the critical shear stress required for grain boundary migration decreased with increasing temperature or simulation time, indicating that grain boundary migration is a thermally activated process. The dependence of the critical shear stress on the tilt angle could be explained by the presence of a specific structure unit composed of under-coordinated atoms. Additionally, the precipitation of Cr23C6 within the bcc-Fe crystal was found to decrease the critical stress required for generating dislocations, while the precipitation on a [001] axial bcc-Fe grain boundary increased the critical shear stress without changing the shear deformation mechanism.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Pengfei Fan, Saurav Goel, Xichun Luo, Yongda Yan, Yanquan Geng, Yang He
Summary: This paper used molecular dynamics simulation to reveal the origins of ductile plasticity in polycrystalline GaAs during nanoscratching, showing that dislocation nucleation in the grain boundaries is the initiation of plastic deformation. Cutting forces and sub-surface damage decrease with increasing scratch velocity, while cutting temperature scales with velocity increase.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Wenbin Liu, Yangyang Cheng, Haonan Sui, Jiaqi Fu, Huiling Duan
Summary: Intergranular fatigue crack nucleation has been found to frequently occur at high angle grain boundaries (HAGBs) but rarely at low angle GBs (LAGBs) during persistent slip band (PSB)-GB interactions. However, the understanding of the role of GB misorientation angles in GB fatigue cracking is limited. In this study, a theoretical framework based on the competition between dislocation transmission and GB cracking is established to investigate this phenomenon. The results show that HAGBs usually have higher resistance to dislocation transmissions, leading to more significant dislocation pile-up and stress concentration, which facilitates GB crack nucleation. The study also emphasizes the importance of GB fatigue damage accumulation and its association with PSB extrusion growth in promoting GB crack nucleation.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
S. Starikov, A. Abbass, R. Drautz, M. Mrovec
Summary: This study investigates temperature-induced disordering transitions of grain boundaries in body-centered cubic metals using classical atomistic simulations. The study reveals that gradual heating leads to continuous disordering of the grain boundary structure, accompanied by two complexion transitions, analogous to transitions described by the Berezinskii-Kosterlitz-Thouless-Halperin-Nelson-Young theory.
Article
Materials Science, Multidisciplinary
Xiao-Feng Yang, Chen-Yun He, Guang-Jian Yuan, Hao Chen, Run-Zi Wang, Yun-Fei Jia, Xian-Cheng Zhang, Shan-Tung Tu
Summary: Molecular dynamics simulations were used to investigate the structures, energies, and tensile properties of grain boundaries in nickel nanolaminated structures. Low-angle grain boundaries were found to consist of dislocations while high-angle grain boundaries were composed of disordered phases. The tensile properties were primarily dependent on textures, with {111} <112> texture showing the best combination of high strength and ductility.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Yue Sheng, Hongda Yang, Wentao Ma, Xiaoyu Jiang
Summary: This paper describes the interaction model between discrete dislocation emission and the grain boundary at the crack tip of microscale grain. The distribution and penetration of dislocations have a new effect on the crack. The results show that the main crack tends to propagate in large grain boundary angle and in small grain size crystalline materials, while wedge crack in the grain boundary tends to initiate with large grain boundary angle and in large grain size crystalline materials.
INTERNATIONAL JOURNAL OF FRACTURE
(2023)
Article
Materials Science, Multidisciplinary
Masato Wakeda, Takahito Ohmura
Summary: This study evaluates the resistance for dislocation transmission across tilt/twist low-angle grain boundaries (LAGBs) and found that the twist LAGB is a stronger obstacle compared to the tilt LAGB. The barrier effect of the grain boundary (GB) on the transmission is stronger for the screw component than for the edge component. The dominant factors of the GB-strengthening effect in LAGB are the incident lattice dislocation type, the structure of GB dislocations, and dislocation-dislocation reactions.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Engineering, Mechanical
Chuanlong Xu, Xiaobao Tian, Wentao Jiang, Qingyuan Wang, Haidong Fan
Summary: This study investigates the migration mechanisms of symmetric tilt grain boundaries (STGBs) in magnesium using molecular dynamic simulations. The results show that the migration mechanisms of grain boundaries are significantly influenced by their structure, with small angle STGBs migrating through twin nucleation and growth, large angle STGBs migrating through the glide of grain boundary dislocations, and medium angle STGBs transforming into twin boundaries through the emission of lattice dislocations/stacking faults.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
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
Materials Science, Multidisciplinary
Anton Bochkarev, Yury Lysogorskiy, Sarath Menon, Minaam Qamar, Matous Mrovec, Ralf Drautz
Summary: The article presents an efficient framework for parametrization of atomic cluster expansion (ACE) models for elements, alloys, and molecules, and discusses some key issues in the parameterization process.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Sergei Starikov, Daria Smirnova, Tapaswani Pradhan, Ilia Gordeev, Ralf Drautz, Matous Mrovec
Summary: The recently developed angular-dependent potential for pure iron has been extended to the Fe-Cr-H ternary system, allowing for simulations of Fe-Cr alloys with various hydrogen concentrations. The model's angular-dependent format and machine learning-based development procedure strike a favorable balance between computational cost and parametrization reliability. Validation tests on binary metallic alloys and hydrogen interactions demonstrate the potential's applicability, especially in large-scale simulations of hydrogen diffusion near crystal defects.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Engineering, Mechanical
Ali Riza Durmaz, Erik Natkowski, Nikolai Arnaudov, Petra Sonnweber-Ribic, Stefan Weihe, Sebastian Munstermann, Chris Eberl, Peter Gumbsch
Summary: This study proposes a validation framework where a fatigue test is simulated by embedding measured microstructures into the specimen geometry and adopting an approximation of the experimental boundary conditions. A phenomenological crystal plasticity model is applied to predict deformation in ferritic steel, and the hotspots in commonly used fatigue indicator parameter maps are compared with damage segmented from micrographs. The framework is published for benchmarking future micromechanical fatigue models.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Chemistry, Physical
Xin Fang, Jihong Wen, Li Cheng, Dianlong Yu, Hongjia Zhang, Peter Gumbsch
Summary: This research demonstrates a design paradigm for creating robust robotic metamaterials using versatile gear clusters. The design allows for continuous tuning of elastic properties while maintaining stability and robust maneuverability, even under heavy loads. The gear-based metamaterials offer excellent properties such as tunable Young's modulus, shape morphing, and fast response.
Article
Multidisciplinary Sciences
Nikolay T. Garabedian, Paul J. Schreiber, Nico Brandt, Philipp Zschumme, Ines L. Blatter, Antje Dollmann, Christian Haug, Daniel Kuemmel, Yulong Li, Franziska Meyer, Carina E. Morstein, Julia S. Rau, Manfred Weber, Johannes Schneider, Peter Gumbsch, Michael Selzer, Christian Greiner
Summary: This paper discusses the lack of FAIR (Findable, Accessible, Interoperable, and Reusable) data and metadata in experimental tribology and proposes a scalable framework for generating FAIR data. Through collaboration with developers, crowdsourcing controlled vocabulary, ontology building, and the use of digital tools, this paper demonstrates a collection of scalable non-intrusive techniques to improve the lifespan, reliability, and reusability of experimental tribological data.
Article
Materials Science, Multidisciplinary
J. Salamania, D. G. Sangiovanni, A. Kraych, K. M. Calamba Kwick, I. C. Schramm, L. J. S. Johnson, R. Boyd, B. Bakhit, T. W. Hsu, M. Mrovec, L. Rogstrom, F. Tasnadi, I. A. Abrikosov, M. Oden
Summary: Through high-resolution scanning transmission electron microscopy, different types of dislocations in titanium nitride films are identified, and their effects on chemical bonding are revealed. The findings have significant implications for the design and interpretation of nanoscale and macroscopic properties of TiN.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Navid Hussain, Torsten Scherer, Chittaranjan Das, Janis Heuer, Rafaela Debastiani, Peter Gumbsch, Jasmin Aghassi-Hagmann, Michael Hirtz
Summary: This study explores the interaction between capillary-printed Galinstan and gold surfaces, revealing the spreading process of liquid metals on gold films and the formation of intermetallic nanostructures. By utilizing various microscopy techniques, a comprehensive understanding of the material interaction between LM and gold is achieved.
Article
Materials Science, Multidisciplinary
Kolja Zoller, Patric Gruber, Michael Ziemann, Alexander Goertz, Peter Gumbsch, Katrin Schulz
Summary: Microwires have gained increasing interest for miniaturizing structural components. Understanding the deformation behavior of microwires is crucial for assessing their applicability and lifespan in specific components. This study analyzes the microstructure evolution of single crystalline gold microwires under torsion, specifically for high-symmetry crystal orientations (100), (110), and (111), using simulation and experimental results. The classification of slip systems can be predicted through theoretical considerations, and it is found that slip system activity, stress relaxation mechanism, and dislocation density depend on specific slip system groups.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Kai Xia, Zheqin Dong, Qing Sun, Rafaela Debastiani, Sida Liu, Qihao Jin, Yang Li, Ulrich W. Paetzold, Peter Gumbsch, Uli Lemmer, Yolita M. Eggeler, Pavel A. Levkin, Gerardo Hernandez-Sosa
Summary: 3D-printed conductive structures with customized properties are fabricated using digital light processing technology and inkjet printing. By optimizing the deposition conditions, conductive structures with sheet resistance <2 ohm sq(-1) are achieved. The integration of an inkjet-printed photodetector onto the nanoporous substrate demonstrates the potential for additive manufacturing of functional 3D-printed optoelectronic devices.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Yury Lysogorskiy, Anton Bochkarev, Matous Mrovec, Ralf Drautz
Summary: The atomic cluster expansion (ACE) is a new class of data-driven interatomic potentials that have a complete basis set. Automation of the construction of the training dataset and indication of model uncertainty are important for the development of any interatomic potential. This study compares two approaches for uncertainty indication of ACE models and finds that the extrapolation grade based on the D-optimality criterion is more efficient and allows for active exploration of new structures.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Sergei Starikov, Vahid Jamebozorgi, Daria Smirnova, Ralf Drautz, Matous Mrovec
Summary: Screw and edge dislocations in body-centered cubic transition metals exhibit distinct diffusion characteristics, with the migration along screw dislocations being faster due to their different atomic structures.
Article
Materials Science, Multidisciplinary
S. Starikov, A. Abbass, R. Drautz, M. Mrovec
Summary: This study investigates temperature-induced disordering transitions of grain boundaries in body-centered cubic metals using classical atomistic simulations. The study reveals that gradual heating leads to continuous disordering of the grain boundary structure, accompanied by two complexion transitions, analogous to transitions described by the Berezinskii-Kosterlitz-Thouless-Halperin-Nelson-Young theory.
Article
Physics, Multidisciplinary
Hannes Holey, Peter Gumbsch, Lars Pastewka
Summary: This study employs molecular dynamics simulations to investigate flow at the molecular scale and explores the influence of in-plane wavelengths. By probing the long wavelength limit in thermodynamic equilibrium, anomalous relaxation of density and longitudinal momentum fluctuations is observed, which can be described by an effective continuum theory.
PHYSICAL REVIEW LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Senja Ramakers, Anika Marusczyk, Maximilian Amsler, Thomas Eckl, Matous Mrovec, Thomas Hammerschmidt, Ralf Drautz
Summary: This paper investigates the thermodynamic stability of different SiC polytypes and identifies that the differences in surface energy are likely the driving force for nucleation, while the differences in bulk thermodynamic stability slightly favor certain polytypes.
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)