Editorial Material
Multidisciplinary Sciences
Yazhou Guo, Xiaolei Wu, Qiuming Wei
Summary: We analyze the results of Zhao et al. (Reports, 17 September 2021, p. 1363) with a focus on the mechanical properties and microstructural evolution. We conclude that their results, together with the explanations and interpretations, are confusing, misleading, or even wrong.
Article
Chemistry, Physical
Vidar Skogvoll, Jonas Ronning, Marco Salvalaglio, Luiza Angheluta
Summary: Topological defects and smooth excitations play crucial roles in determining the properties of systems exhibiting collective order. We propose a generic non-singular field theory that provides a comprehensive description of defects and excitations in systems with O(n) broken rotational symmetry. By employing this formalism, we investigate fast events, including defect nucleation/annihilation and dynamical phase transitions, where the interplay between topological defects and nonlinear excitations is particularly significant. We showcase the versatility of our approach by applying it to various systems such as Bose-Einstein condensates, active nematics, and crystal lattices.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Linfeng Bu, Zhao Cheng, Yin Zhang, HengAn Wu, Ting Zhu, Lei Lu
Summary: The strength-controlling dislocation mechanism in nanotwinned metals is illuminated by partitioning the flow stress into effective stress and back stress components. Recent experiments show a nearly constant saturated effective stress of about 100 MPa in nanotwinned Cu with nanotwin thicknesses less than 100 nm. This surprising result suggests that trans-twin dislocations spanning multiple nanotwin lamellae, rather than threading dislocations within individual lamellae, control the effective stress.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Mingyan Huang, Qin Yu, Jiasheng Li, Yongjin Mai
Summary: Nanotwinned metals, specifically nanotwinned copper, exhibit superior tribological performance due to the sliding-induced layered heterostructure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Engineering, Mechanical
Yongpan Zeng, Xiaoyan Li
Summary: This study conducted large-scale atomistic simulations to investigate the high-temperature creep mechanisms of nanocrystalline and nanotwinned TiAl alloys, revealing the influences of applied stress, grain size, and temperature on creep behaviors and mechanisms. Particularly, a critical twin thickness was identified for nanotwinned samples under high stress, leading to a transition in creep mechanism from dislocation nucleation and slip to detwinning.
EXTREME MECHANICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Chetan Singh, Hariharan Krishnaswamy, Sudarshan Phani Pardhasaradhi, Fu Chian Chen, Dinh-Phuc Tran, Chih Chen, Jayant Jain
Summary: Depth sensing nanoindentation experiments were conducted to investigate the strain rate dependentindependent behaviors of nanotwinned microcrystalline Cu. Different additives were used for electro-deposition to control microstructural parameters, such as grain size and twin spacing. The sample with the lowest twin lamella spacing exhibited a lower stress exponent, potentially leading to enhanced ductility. The mechanical properties obtained by introducing nanotwins in coarser initial grain size are comparable to nanotwinned nanocrystalline materials, suggesting a new paradigm for a broader range of nanotwinned materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Jyun-Yu Lai, Dinh-Phuc Tran, Shih-Chi Yang, I-Hsin Tseng, Kai-Cheng Shie, Jihperng Leu, Chih Chen
Summary: In this study, highly (111)-oriented nanotwinned Cu films were fabricated by adjusting electroplating parameters, and the relaxation behaviors of thermal stresses in the films were investigated. The results showed that the degree of (111)-preferred orientation and grain size decreased significantly with increasing current density, and films with larger grains exhibited slower rates of stress relaxation.
Article
Nanoscience & Nanotechnology
B. Zhu, Y. Liu
Summary: An anisotropy Cosserat continuum model is proposed to describe the mechanical behavior of nanotwinned copper, taking into account the differences in crystal orientation and strain gradient between the twin and the matrix. The model shows good agreement with experimental stress-strain curves of nanotwinned copper with varying twin thickness and coarse grain copper. The effects of twin spacing, twin thickness, and preferred orientation on the mechanical performance of nanotwinned copper are systematically studied, with the results revealing that the anisotropy effect mainly affects elastic modulus and yield strength, while the strain gradient effect influences yield strength and strain hardening rate. The results also demonstrate the importance of coordinated deformation between different nanotwinned structures in achieving stress softening or uniform stress distribution.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Shou-Yi Chang, Yi-Chung Huang, Shao-Yi Lin, Chia-Ling Lu, Chih Chen, Ming Dao
Summary: The nanoscopic deformation of < 111 > nanotwinned copper nanopillars under different strain rates was investigated using in situ transmission electron microscopy. The study found that the deformation mechanism, including dislocation activity and twin boundary migration, is influenced by strain rates. At higher strain rates, dislocations accumulate in the nanotwinned copper, resulting in significant hardening. At lower strain rates, detwinning occurs and the hardening is reduced. Different deformation mechanisms, such as dislocation activity and twin boundary migration via atom motion, are proposed based on the experimental results.
Article
Multidisciplinary Sciences
Avanish Mishra, Cody Kunka, Marco J. Echeverria, Remi Dingreville, Avinash M. Dongare
Summary: During shock loading, materials go through various transient deformation modes that can influence their final state. By atomistic simulation and diffraction experiments, specific deformation characteristics were identified to aid in interpreting the results of shock experiments.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Mechanical
C. Li, K. Yang, Y. H. Gao, L. Wang
Summary: Large-scale molecular dynamics simulations were conducted to investigate dislocation-dominated void nucleation in single crystal copper under shock loading and spall failure. The study found that the spall strength is influenced by the orientation of the crystal, with group II orientations showing the highest spall strength. The formation of stable immobile dislocations was found to play a key role in void nucleation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Nanoscience & Nanotechnology
J. X. Li, Y-N Shi, Z. S. You, X. Y. Li
Summary: This study investigates the plastic deformation in an electrodeposited nanotwinned columnar grained Ni-Mo film with extremely fine grain size. The significant detwinning and texture evolution observed during tensile straining can be attributed to interface energy minimization. The activity of threading dislocations contributes to high yield strength and noticeable deformability in the material.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Ting-Chun Lin, Chien-Lung Liang, Shan-Bo Wang, Yung-Sheng Lin, Chin-Li Kao, David Tarng, Kwang-Lung Lin
Summary: The introduction of highly (111)-oriented nanotwinned Cu effectively inhibits detrimental Cu protrusion in TSV technology, reducing protrusion height during thermal annealing and strengthening TSV by impeding dislocation glide. The electrodeposited nanotwinned Cu TSV shows great thermal stability and slight micro-hardness loss under thermal annealing.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Hsiang-Yuan Cheng, Dinh-Phuc Tran, K. N. Tu, Chih Chen
Summary: High-strength nanotwinned copper foils with slanted columnar grain structures were fabricated using a rotary electroplating system, which can serve as an anode current collector in lithium ion batteries. By controlling the temperature and current density during electroplating, the nanotwinned microstructure can be tuned to enhance the mechanical properties of the foils. The ultimate tensile strength of the electroplated copper foils was increased by 60%, reaching 637 MPa from the original 403 MPa.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Multidisciplinary Sciences
Yan Lu, Yongchao Chen, Yongpan Zeng, Yin Zhang, Deli Kong, Xueqiao Li, Ting Zhu, Xiaoyan Li, Shengcheng Mao, Ze Zhang, Lihua Wang, Xiaodong Han
Summary: Understanding the nanoscale fracture processes and mechanisms in BCC metals is important for preventing failure. In this study, in situ atomic-resolution observations reveal the crack growth process and the effects of temperature and strain rate on crack growth. The results provide insights into the dislocation-mediated mechanisms of the ductile to brittle transition in BCC refractory metals.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Guang Yang, Shang-Yi Ma, Kui Du, Dong-Sheng Xu, Sen Chen, Yang Qi, Heng-Qiang Ye
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2019)
Article
Multidisciplinary Sciences
Lihua Wang, Kui Du, Chengpeng Yang, Jiao Teng, Libo Fu, Yizhong Guo, Ze Zhang, Xiaodong Han
NATURE COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Lu Qi, Suyun He, Chunjin Chen, Binbin Jiang, Yulin Hao, Hengqiang Ye, Rui Yang, Kui Du
Article
Microscopy
Suyun He, Chunyang Wang, Lu Qi, Hengqiang Ye, Kui Du
Article
Chemistry, Multidisciplinary
Guixin Cao, Kepeng Song, Liang Qiao, Junjie Guo, Weihua Han, Xuechu Shen, Kui Du, Jincang Zhang, David J. Singh, Yuze Gao
Summary: By embedding ultra-small ZrO2 nanopillars, the strain distribution of La2/3Sr1/3MnO3 films was controlled, leading to rational manipulation of their functional properties. Increasing the number of nanopillars resulted in a significant decrease in the Curie temperature and metal-insulator transition temperature of the films, demonstrating the remarkable tuning capability of vertical tensile stress.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Suyun He, Binbin Jiang, Chunyang Wang, Chunjin Chen, Huichao Duan, Shuai Jin, Hengqiang Ye, Lei Lu, Kui Du
Summary: The development of bulk metals with large reversible strain is important for flexible electronic devices. Nanometer-scale twins in bulk metals have shown high strength, good ductility, and promising electrical conductivity. The introduction of thin twin lamellae in nanotwinned metals leads to ultrahigh reversible strain by suppressing dislocation nucleation.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Chunjin Chen, Kepeng Song, Xuelu Wang, Kui Du
Summary: The study observed the packing structure of gold nanoribbons with heptagonal clusters, and revealed the structure transition and the quantum change of conductance through in situ observation and theoretical calculations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Xuelu Wang, Chunjin Chen, Binbin Jiang, Huichao Duan, Kui Du
Summary: Phase engineering of nanomaterials is gaining increasing research interest due to the influence of crystal structures on the physical and chemical properties of metals. In this study, a novel simple hexagonal structured gold was fabricated through in situ selective etching on an ordered Cu-Au intermetallic compound, demonstrating a low coordination number and packing fraction. The discovery of this new crystal structure suggests that metals can form diverse structures by changing their effective atomic volume, providing opportunities for engineering new physical properties and applications.
Article
Nanoscience & Nanotechnology
Chunjin Chen, Xuelu Wang, Shuhui Hao, Kui Du
Summary: This study demonstrates that the orientation rotation of monoatomic-layered gold membrane embedded in a gold crystal can be controlled through dynamic vortexing, providing a conceptual approach for constructing a novel electronic system with monoatomic-layered metals and inspiring applications for future spintronics.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Peng Zhao, Guang Xie, Chunjin Chen, Xuelu Wang, Panlin Zeng, Fang Wang, Jian Zhang, Kui Du
Summary: This work investigates the precipitation process of topologically close packed (TCP) phases in nickel-base single crystal superalloys under thermomechanical fatigue deformation, with and without the addition of Ru. It is found that deformation twins on different {111} planes intersect and form high angle boundaries, which have a similar structure to topologically close packed sigma phase and are enriched in Re, Ru, Co, and Cr. The segregation of Ru to the interfaces between TCP phase and the matrix reduces interface energies and dramatically changes the morphology of TCP phase precipitates. These findings provide insights into the effects of lattice imperfections and coevolution chemistry on TCP phase formation in superalloys, as well as inhomogeneous precipitation in alloys in general.
Article
Metallurgy & Metallurgical Engineering
Peng Zhao, Guang Xie, Huichao Duan, Jian Zhang, Kui Du
Summary: Ni-based single crystal superalloys are investigated using SEM and TEM to understand the deformation mechanism during thermo-mechanical fatigue. The results reveal the formation of deformation twins and recrystallized grains, with different types of grain boundaries observed. Aberration-corrected TEM analysis provides further insights into the twinning-induced dynamic recrystallization process. These findings contribute to improving the understanding of the deformation mechanism of single crystal superalloys under service conditions.
ACTA METALLURGICA SINICA
(2023)
Article
Chemistry, Physical
Chunyang Wang, Hongyang Liu, Huichao Duan, Zhenwei Li, Panlin Zeng, Peichao Zou, Xuelu Wang, Hengqiang Ye, Huolin L. Xin, Kui Du
Summary: The study focuses on enhancing catalytic activity by constructing abundant low-coordinated sites, and uses atomic-resolution electron tomography to visualize the coordination environment of hierarchical nanoporous gold in three dimensions, revealing that the introduction of low-coordinated active sites significantly improves its catalytic performance in CO oxidation.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Multidisciplinary
Qi Zhu, Youran Hong, Guang Cao, Yin Zhang, Xiaohan Zhang, Kui Du, Ze Zhang, Ting Zhu, Jiangwei Wang
Article
Materials Science, Multidisciplinary
Chunyang Wang, Huichao Duan, Chunjin Chen, Peng Wu, Dongqing Qi, Hengqiang Ye, Hai-Jun Jin, Huolin L. Xin, Kui Du
Article
Materials Science, Multidisciplinary
Yongchao Zhang, Wei Zhang, Beining Du, Wenqing Li, Liyuan Sheng, Hengqiang Ye, Kui Du