Article
Materials Science, Multidisciplinary
Roman Groger
Summary: A study has found that the phenomenon of anomalous slip in transition metals is closely related to the stability of screw junctions between dislocations. In most bcc metals, these junctions do not break under stress and the dislocations can only move on common crystal planes. However, in alkali metals, tantalum, and iron, the application of stress causes the dislocations to unzip and further glide on predicted planes. These results provide an explanation for the experimentally observed anomalous slip and suggest a reason for its increased propensity in later stages of plastic deformation.
MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Priyanka Agrawal, S. Karthikeyan, Surendra Kumar Makineni, Baptiste Gault, Dipankar Banerjee
Summary: A dynamic strain aging (DSA) regime is established in a near-a titanium alloy through constant strain rate tests, with jogged screw dislocations dominating the dislocation structure within slip bands. The model predicts a DSA peak at 673-723K, with C and Si as solute species responsible for DSA, but dominated by C in this temperature and strain rate regime. Atom probe tomography confirms C and Si segregation at the dislocations, supporting the model.
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
Peng Zhang, Pengming Cheng, Jinyu Zhang, Gang Liu, Jerome Weiss, Jun Sun
Summary: The intermittent plasticity of pure Mo microcrystals was studied to explore its dependence on external size and temperature. The study found that there is a coupled size and temperature effect on the mild-to-wild transition in plastic fluctuations. Strain-rate sensitivity tests were conducted, indicating that mild plasticity is associated with screw dislocation motions controlled by thermally activated nucleation of kink-pairs, while wild plasticity is nearly athermal. A controlling parameter based on a simple dislocation source model was proposed to unify the coupled sample size and temperature effects on the mild-to-wild transition, which could have practical significance for microscale applications.
Article
Physics, Applied
Yajuan Cheng, Masahiro Nomura, Sebastian Volz, Shiyun Xiong
Summary: This Perspective discusses the impact of one-dimensional defects, i.e. dislocations, on phonon transport engineering, including mechanisms of thermal conductivity reduction and complex stress fields induced by dislocations. The emphasis is placed on anisotropic thermal transport in materials with well-oriented dislocations. The article concludes with prospects for future research on phonon-dislocation interactions in theory and experiments.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Neha Aggarwal, Shibin Krishna, Lalit Goswami, Govind Gupta
Summary: The reduction of screw dislocations has a significant impact on improving the performance of photodetection devices, including decreasing dark current and enhancing photogenerated current. Additionally, reducing dislocation density can increase the responsivity and external quantum efficiency of photodetection devices.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Jiashi Miao, Connor Slone, Sriswaroop Dasari, Maryam Ghazisaeidi, Rajarshi Banerjee, Easo P. George, Michael J. Mills
Summary: A CrCoNi based medium entropy alloy with small additions of Ti, Al and Nb (denoted as (CrCoNi)(93)Al4Ti2Nb) exhibits comparable tensile properties to equiatomic CrCoNi alloy. Spatially-localized long range ordering (LRO) L1(2) domains are found in this alloy, where deformation occurs by the slip of a/2 <110> dislocations and leading dislocations glide as pairs in slip bands due to the existence of LRO domains. Multipoles are formed through dislocation slip with opposite signs on adjacent {111} slip planes, serving as building blocks for subgrain structures consisting of fine slip bands.
Article
Chemistry, Physical
Tongqi Wen, Rui Wang, Lingyu Zhu, Linfeng Zhang, Han Wang, David J. Srolovitz, Zhaoxuan Wu
Summary: Large scale atomistic simulations using machine learning potentials provide direct access to important materials phenomena, with the ability to accurately capture material structures, properties, and responses through specialized approaches. The method is general and extensible to other systems and properties, enabling accurate reproduction of properties of interest.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Peter Sutter, Raymond R. Unocic, Eli Sutter
Summary: This research presents a rational synthetic route for controlling the placement and tuning of single dislocations in van der Waals nanowires, allowing for the identification of their functional properties and potential technological applications.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Geochemistry & Geophysics
Diana Avadanii, Lars Hansen, Katharina Marquardt, David Wallis, Markus Ohl, Angus Wilkinson
Summary: The distribution of grain-boundary types in olivine-rich rocks might affect the mechanical behavior during deformation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Materials Science, Multidisciplinary
Mingxu Wu, Shubin Wang, Fei Xiao, Guoliang Zhu, Chao Yang, Da Shu, Baode Sun
Summary: An equiatomic VNbTi medium-entropy alloy with outstanding tensile properties and unique deformation behavior has been reported. The alloy exhibits three deformation mechanisms - screw dislocation glide, deformation twinning, and dislocation accumulation induced kink bands, which contribute to a large elongation above 20%. The activation of twin bands and kink bands impedes dislocation motion and alleviates stress concentration, providing opportunities for designing ductile refractory medium- and high-entropy alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Kazushige Tokuno, Masatoshi Mitsuhara, Shinnosuke Tsuchida, Ryo Tsuboi, Junji Miyamoto, Masahiro Hagino, Takashi Inoue, Kouki Nishidate
Summary: BF-STEM was used to investigate the tangled dislocation structures inside the dislocation channels of rapidly cooled and tensile deformed aluminum single crystals. It was found that prismatic dislocation loops were activated inside the channels, and interactions between these loops formed butterfly shape dislocation loops, acting as obstacles against the dislocations.
MATERIALS TRANSACTIONS
(2022)
Article
Materials Science, Multidisciplinary
Kazushige Tokuno, Masatoshi Mitsuhara, Masahiro Hagino
Summary: Early-stage dislocation structures inside dislocation channels of rapidly cooled and tensile-deformed aluminum single crystals were investigated using STEM-BF. Prismatic dislocation loops originated from dislocations of the primary slip system were mainly formed inside dislocation channels. Interactions between dislocation loops produced butterfly-shaped dislocation loops, which act as obstacles to subsequent dislocation multiplication and glide. Angled structures would be formed around the arrays of prismatic dislocation loops originated from dislocations of the primary slip system.
MATERIALS TRANSACTIONS
(2023)
Article
Materials Science, Multidisciplinary
Shunsuke Kitou, Yu Oshima, Atsutomo Nakamura, Katsuyuki Matsunaga, Hiroshi Sawa
Summary: The plasticity of zinc sulfide (ZnS) single crystals is significantly altered by the light environment: they are ductile in darkness but brittle under light. This study investigated the microscopic deformation modes of light-environment-dependent plasticity using synchrotron X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning TEM (STEM) measurements. The results showed that the deformation modes of ZnS at the initial stage were similar regardless of light environments, although the macroscopic deformation behaviors were quite different.
Article
Materials Science, Multidisciplinary
J. Narayan
Summary: The study explores the formation of screw dislocations and their role in the growth of nanostructured materials, showing how they can transform into helical dislocations and eventually pair up to form a double helix, impacting the growth of nanowires.
MATERIALS RESEARCH LETTERS
(2021)
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)