Article
Nanoscience & Nanotechnology
J. -E. Brandenburg, J. Seo, K. Eto, D. A. Molodov, S. Tsurekawa
Summary: The study used nanoindentation to investigate the local mechanical properties near 1010 tilt grain boundaries in magnesium bicrystals with different misorientation angles. It was found that critical shear-stress for the second pop-in differed substantially for grain boundaries with different structures, indicating important mechanical property variations in these boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Mechanics
Gerard Michot
Summary: This paper presents the analytical solution for the equilibrium conditions between a dislocation pile-up and a loaded crack, taking into account the influence of image distributions. The study highlights the effects of image forces on the stress intensity factor, dislocation nucleation conditions, and criteria for crack propagation. It also discusses the control of dislocation free zone size in semi-brittle and ductile materials, as well as the modification of Griffith criteria in the presence of plastic deformation.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Nanoscience & Nanotechnology
F. J. Dominguez-Gutierrez, S. Papanikolaou, A. Esfandiarpour, P. Sobkowicz, M. Alava
Summary: The study investigates the effects of high temperature on the mechanical deformation properties of single crystalline Mo under nanoindentation, revealing that temperature increase changes dislocation densities, mechanisms, atomic displacements, and hardness. The characteristic formation of [001] dislocation junctions and high-temperature stability may be responsible for the persistent thermomechanical stability of Mo, contrasting with other BCC metals.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yang Li, Sabyasachi Chatterjee, Enrique Martinez, Nasr Ghoniem, Giacomo Po
Summary: In the model, basal-to-prismatic cross-slip is energetically favorable, while prismatic-to-basal cross-slip is only activated under specific conditions. The proposed mechanism for basal slip of <a> screw dislocations in Zr involves the formation and lateral migration of kink pairs formed by double cross-slip.
Article
Materials Science, Multidisciplinary
Xu Long, Ziyi Shen, Qipu Jia, Jiao Li, Ruipeng Dong, Yutai Su, Xin Yang, Kun Zhou
Summary: Using molecular dynamics and finite element simulations, this study reveals that the shape of the plastic zone in elastoplastic materials under a Berkovich indenter is hemispherical across a wide range of length scales. By analyzing the load-penetration depth curve, dimensionless functions are derived to describe the radius of the hemispherical plastic zone. The study also identifies the key parameters for predicting plastic deformation during loading and unloading stages. Furthermore, the proposed dimensionless analysis shows that the plastic zone radii are significantly different for materials with the same load-penetration depth curve, overcoming the long-standing uniqueness issue in determining the elastoplastic properties of materials based on nanoindentation responses.
MECHANICS OF MATERIALS
(2022)
Article
Engineering, Mechanical
M. P. Ariza, M. Ortiz
Summary: The semi-discrete particle method developed for Volterra dislocation currents uses particles to represent line elements and employs mobility kinetics driven by elastic and applied forces. The method weakly enforces the divergence constraint through mesh-free interpolation, avoiding the need for explicitly defining linear connectivity between particles. This 'line-free' approach offers computational advantages in simplicity, robustness, and efficiency, particularly in tracking complex dislocation patterns.
EXTREME MECHANICS LETTERS
(2021)
Article
Materials Science, Ceramics
Ryo Nakamura, Hiroshi Masuda, Hidehiro Yoshida
Summary: This study investigates the local mechanical responses near single grain boundaries of oxide ceramics through nanoindentation. Contrary to traditional strengthening theories, the study found negligible variations in hardness among grain interiors, grain boundary vicinities, and grain boundaries. However, transmission electron microscopy observation revealed the presence of dislocation pileups at grain boundaries. Therefore, single grain boundaries make limited contributions to the mechanical properties of oxide ceramics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Mechanical
Marion Borde, Laurent Dupuy, Adrien Pivano, Bruno Michel, David Rodney, Jonathan Amodeo
Summary: In this study, the plasticity of irradiated UO2 is investigated using molecular dynamics and discrete dislocation dynamics simulations. The interactions between irradiation loops and glissile dislocations are studied, and the effects of these interactions on the strengthening of UO2 are characterized. The collective behavior of irradiation defects and the formation of clear bands in UO2 fuel at high temperature are also discussed.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Nanoscience & Nanotechnology
Frederic Habiyaremye, Antoine Guitton, Florian Schafer, Felicitas Scholz, Mike Schneider, Jan Frenzel, Guillaume Laplanche, Nabila Maloufi
Summary: This study reveals that the deformation mechanisms and micromechanical responses in the alloy vary depending on the distance between a low-angle grain boundary and the nanoindenter tip. The low-angle grain boundary can either accommodate plasticity by blocking the nanoindentation-induced dislocations or induce slight motions of its constituent dislocations, depending on the specific distance between the grain boundary and the indenter tip.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Zhijie Ge, Hongjun Li, Xiao Cheng
Summary: Nanoindentation experiments were conducted to study the plastic deformation mechanism of single crystal diamond. It was found that the plastic characteristic of diamond was due to phase transition rather than dislocation slip. The nucleation and growth of 1/2[110]{111} complete dislocation ring during the plastic deformation of diamond were determined by observing pop-in events and dislocation evolution. The formation and growth of the dislocation ring were attributed to the phase transition from disordered sp3 to ordered sp2 carbon atoms. It was concluded that phase transition is an important excitation source for plastic deformation at the atomic scale in diamond.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
A. Breidi, S. L. Dudarev
Summary: This study investigates the thermal evolution and elevated temperature annealing of the dislocation microstructure in an irradiated metal using discrete dislocation dynamics simulations. The results suggest that the evolution of dislocations is primarily driven by the pipe diffusion of atoms along the dislocation lines and the diffusion of vacancies in the crystal bulk. The temperature plays a significant role in the coalescence and coarsening of the dislocation loop microstructure.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Jian Wang, Lv Zhao, Minsheng Huang, Yaxin Zhu, Zhenhuan Li
Summary: The presence of hydrogen in single-crystal bcc Fe was found to reduce the nucleation strength of dislocations and promote their motion. This indicates that hydrogen has a significant impact on the behavior of dislocations.
ACTA MECHANICA SOLIDA SINICA
(2022)
Article
Instruments & Instrumentation
K. Mulewska, F. Rovaris, F. J. Dominguez-Gutierrez, W. Y. Huo, D. Kalita, I. Jozwik, S. Papanikolaou, M. J. Alava, L. Kurpaska, J. Jagielski
Summary: In this study, multi-scale numerical modeling was used to investigate the nanomechanical response of pristine and ion-irradiated high purity iron specimens. The sudden displacement burst observed in the load-displacement curves during loading was found to be connected with increased shear stress due to dislocation slip activation and mobilization by ion irradiation. Molecular dynamics and 3D-discrete dislocation dynamics simulations provided insights into the nucleation mechanisms of geometrically necessary dislocations and their qualitative agreement with GNDs density mapping images. It was also observed that the nucleated dislocations and defects were responsible for the increase in material hardness, as evidenced by the recorded load-displacement curves and pop-ins analysis.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2023)
Article
Chemistry, Multidisciplinary
Atsutomo Nakamura, Xufei Fang, Ayaka Matsubara, Eita Tochigi, Yu Oshima, Tatsushi Saito, Tatsuya Yokoi, Yuichi Ikuhara, Katsuyuki Matsunaga
Summary: Recent studies have discovered significant plasticity in bulk compression of single-crystal ZnS under complete darkness. The introduction of the photoindentation technique provides a new approach to understand the effects of light on dislocation nucleation and mobility. Research shows that light irradiation significantly increases the pop-in stress of dislocation nucleation near the surface of ZnS, leading to a drastic reduction in dislocation mobility.
Article
Materials Science, Multidisciplinary
Peng Song, Kiyohiro Yabuuchi, Philippe Spaetig
Summary: FeCrAl(Zr)-ODS ferritic steels were studied to understand their radiation hardening behavior. Irradiation-induced hardening increased with increasing displacement damage, and the addition of Zr reduced the ion-irradiation hardening. The relationship between the plastically deformed zone size and the density of geometrically necessary dislocations was determined.
Article
Materials Science, Multidisciplinary
M. J. Lai, T. Li, D. Raabe
Article
Materials Science, Multidisciplinary
Yanhong Chang, Andrew J. Breen, Zahra Tarzimoghadam, Philipp Kuernsteiner, Hazel Gardner, Abigail Ackerman, Anna Radecka, Paul A. J. Bagot, Wenjun Lu, Tong Li, Eric A. Jaegle, Michael Herbig, Leigh T. Stephenson, Michael P. Moody, David Rugg, David Dye, Dirk Ponge, Dierk Raabe, Baptiste Gault
Article
Materials Science, Multidisciplinary
R. Soler, A. Evirgen, M. Yao, C. Kirchlechner, F. Stein, M. Feuerbacher, D. Raabe, G. Dehm
Article
Materials Science, Multidisciplinary
Bob Svendsen, Pratheek Shanthraj, Dierk Raabe
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2018)
Article
Materials Science, Multidisciplinary
Shyam Katnagallu, Baptiste Gault, Blazej Grabowski, Joerg Neugebauer, Dierk Raabe, Ali Nematollahi
MATERIALS CHARACTERIZATION
(2018)
Article
Materials Science, Multidisciplinary
Zhiming Li, Dierk Raabe
MATERIALS CHEMISTRY AND PHYSICS
(2018)
Article
Nanoscience & Nanotechnology
Huan Zhao, Baptiste Gault, Dirk Ponge, Dierk Raabe, Frederic De Geuser
SCRIPTA MATERIALIA
(2018)
Article
Nanoscience & Nanotechnology
Hye Ji Im, Surendra K. Makineni, Baptiste Gault, Frank Stein, Dierk Raabe, Pyuck-Pa Choi
SCRIPTA MATERIALIA
(2018)
Article
Nanoscience & Nanotechnology
P. Kontis, M. Kohler, S. Evertz, Y. -T. Chen, V. Schnabel, R. Soler, J. Bednarcik, C. Kirchlechner, G. Dehm, D. Raabe, J. M. Schneider, B. Gault
SCRIPTA MATERIALIA
(2018)
Article
Materials Science, Multidisciplinary
Christian H. Liebscher, Mengji Yao, Poulumi Dey, Marta Lipinska-Chwalek, Benjamin Berkels, Baptiste Gault, Tilmann Hickel, Michael Herbig, Joachim Mayer, Joerg Neugebauer, Dierk Raabe, Gerhard Dehm, Christina Scheu
PHYSICAL REVIEW MATERIALS
(2018)
Article
Materials Science, Multidisciplinary
S. Medrano, H. Zhao, F. De Geuser, B. Gault, L. T. Stephenson, A. Deschamps, D. Ponge, D. Raabe, C. W. Sinclair
Article
Materials Science, Multidisciplinary
P. Pandey, S. K. Makineni, A. Samanta, A. Sharma, S. M. Das, B. Nithin, C. Srivastava, A. K. Singh, D. Raabe, B. Gault, K. Chattopadhyay
Article
Materials Science, Multidisciplinary
Jing Su, Dierk Raabe, Zhiming Li
Article
Chemistry, Multidisciplinary
Seok Su Sohn, Alisson Kwiatkowski da Silva, Yuji Ikeda, Fritz Koermann, Wenjun Lu, Won Seok Choi, Baptiste Gault, Dirk Ponge, Joerg Neugebauer, Dierk Raabe
ADVANCED MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
I. R. Souza Filho, M. J. R. Sandim, R. Cohen, L. C. C. M. Nagamine, H. R. Z. Sandim, D. Raabe
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2019)
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)