Article
Materials Science, Multidisciplinary
Tatyana Fedyaeva, Santhosh Mathesan, Anuj Bisht, Zhao Liang, Dan Mordehai, Eugen Rabkin
Summary: Hemispherical nanoparticles of Ag-33 at.% Au and Ag-60 at.% Au alloys were fabricated by solid state dewetting of Ag-Au bilayers on a sapphire substrate. In-situ microcompression tests and atomistic molecular dynamics simulations revealed the plastic deformation behavior and the absence of solid solution hardening effect in the alloys.
Article
Metallurgy & Metallurgical Engineering
Yu-Juan Geng, Chun-Yang Wang, Jing-Xin Yan, Zhen-Jun Zhang, Hua-Jie Yang, Jin-Bo Yang, Kui Du, Zhe-Feng Zhang
Summary: The movement and dissociation of dislocations play a significant role in understanding the plastic deformation mechanisms and mechanical properties of metals. Previous beliefs about the dissociation of dislocations in Au have been proven wrong, as new atomistic modeling and experimental observations show that this reaction can be completely suppressed. The deviation of Burgers vectors of partials from Shockley partials depends heavily on the tilt angle, which has important implications for better understanding face-centered cubic metals (FCC).
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Mayu Asano, Motohiro Yuasa, Hiroyuki Miyamoto
Summary: The study found that materials with low SFE exhibit a decrease in dislocation cell or grain sizes during the early stages of deformation, regardless of the presence of solute atoms. However, the solid solution effect causes a delayed saturation of dislocation density and hardening, leading to the formation of a UFG structure in the later stages of deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Jun-Hyoung Park, Sung-Hoon Kim, Seung-Gyun Kim, Hyung-Wook Kim, Jae-Chul Lee
Summary: The study focuses on producing Al-xMg alloys with high strength and ductility at cryogenic temperatures, achieved through a combination of thermo-mechanical treatment. Gradual addition of Mg significantly improves the cryogenic tensile properties of the alloys. Comparing Al-xMg alloys with different Mg contents provides insights into enhancing these properties for applications at cryogenic temperatures.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Wei Jiang, Xuzhou Gao, Yazhou Guo, Xiang Chen, Yonghao Zhao
Summary: In this study, the dynamic impact behavior and deformation mechanisms of a Cr26Mn20Fe20Co20Ni14 high-entropy alloy were systematically explored. The alloy exhibited uniform plastic deformation and a significant strain rate dependence in yield strength. Microstructural analyses revealed a transition in deformation mechanisms and interactions between different dislocations, stacking faults, and twins in strengthening the material. This work provides a comprehensive understanding of the high-entropy alloy's behavior and strengthening mechanisms.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Physics, Applied
Shunta Harada, Hitoshi Sakane, Toshiki Mii, Masashi Kato
Summary: The movement of partial dislocations in SiC bipolar devices can be suppressed by proton implantation, which is compatible with semiconductor processing. This finding addresses the issue of bipolar degradation in SiC power devices.
APPLIED PHYSICS EXPRESS
(2023)
Article
Metallurgy & Metallurgical Engineering
Y. Yue, S. L. Yang, C. C. Wu, J. F. Nie
Summary: An unusual F3 basal stacking fault resulting from twin-dislocation interaction in magnesium is observed in molecular dynamics simulation. The F3 fault is produced in the twin lattice from the interaction between a migrating twin boundary and a partial dislocation in the matrix. The formation frequency of the F3 fault is higher at lower shear stress and/or lower temperature, and it can decompose into other types of stacking faults at higher temperature.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Chemistry, Physical
Li Fu, Hualong Ge, Boning Zhang, Xuan Zhou, Lihua Ma, Lixian Zhu, Shaoping Lu, Bin Yuan, Junjie He, Yong Mao
Summary: This study investigates the microstructural evolution and the effects of discontinuous precipitation (DP) and ordering on the age-hardening behavior in Au-20Ag-30Cu ternary alloy. Experimental observations reveal that DP forms at grain boundaries consisting of alternating α1 and α2 phases, while L12-type AuCu3 ordered phase with nanometric spherical particles forms at grain interior and within the lamellar α1 phase of DP. Both DP and L12-type AuCu3 nanoprecipitates show growth with elevated aging temperature. DP at grain boundaries is found to have a detrimental effect on overall age-hardening, while the L12-type AuCu3 nanoparticles effectively impede the movement of dislocations to enhance age-hardening.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Junkui Li, Zhinan Yang, Gengcen Zhao, Fucheng Zhang
Summary: This paper presents a strategy to overcome the strength-ductility trade-off in high-strength carbide-free nanobainite steel. By designing two successive cycles of deformation within specific stacking fault energy ranges, the study successfully achieved a high density of dislocations and nanotwins in the steel, resulting in excellent strength and ductility. The proposed strategy has potential applications in the development of high-strength, high-ductility materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Zhichao Liu, Zhihua Nie, Xianjin Ning, Xiuchen Zhao, Xiaodong Yu, Fuchi Wang, Chengwen Tan
Summary: This study investigates the mechanical response and microstructural evolution of Ni-27 W alloys, finding that they exhibit a high strain hardening capacity mainly due to the dominance of planar slip mechanism in plastic deformation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Guo-Liang Shi, Kui Zhang, Xing-Gang Li, Yong-Jun Li, Ming-Long Ma, Jia-Wei Yuan, Hong-Ju Zhang
Summary: The study analyzed the influence of thermomechanical treatment T10 on the dislocation structure and precipitation behavior in magnesium alloys, and found that T10 treatment can significantly enhance the strengthening effect of magnesium alloys. This is achieved by forming high-density basal I-1 stacking faults and < c + a > dislocations as nucleation sites and fast diffusion channels for continuous precipitates in extension twins.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Nanoscience & Nanotechnology
Kang Yan, Zhongwei Chen, Wenjie Lu, Yanni Zhao, Wei Le, YanQing Xue, Sufyan Naseem, Ali Wafaa
Summary: In-situ tension test in a transmission electron microscope was used to study the fracture process of aluminium, finding that multiple Frank-Read dislocation sources are formed in the crystal thinning area at the front of the crack, leading to the nucleation of nanocracks. Continuous perfect dislocations emitted from the crack tip slip, decompose, and form twin boundaries, with residual dislocations forming dislocation walls and stacking faults, ultimately causing slip at the twin boundary.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
B. Srinivas, S. K. Panigrahi
Summary: This study focuses on developing a constitutive model to establish the influence of twin fraction and cryodeformed microstructure on the work hardening behavior of cryodeformed materials with medium and low stacking fault energies.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Jie Li, Xinhua Yang, Peng Wang, Qunli An
Summary: This study investigates the interaction between low-angle GBs and SFTs in pure Ni and Ni-Fe bicrystals using molecular dynamics simulations. The results show that Ni-Fe bicrystals have a higher healing efficiency for SFTs compared to pure Ni, and the addition of Fe atoms reduces stacking fault energy and promotes the transformation of certain dislocations, enhancing the healing effect on SFTs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Applied
Saeid Aliakbarpour, Mohammad Amjadi, Tooba Hallaj
Summary: We introduced a sensitive colorimetric platform for hydrogen peroxide (H2O2) assay using gold/silver nanocages. The platform exhibits high sensitivity and low detection limit, and can be used for measurement using a smartphone.
Review
Materials Science, Multidisciplinary
Chao Zhang, Hangbo Zhou, Shuai Chen, Gang Zhang, Zhi Gen Yu, Dongzhi Chi, Yong-Wei Zhang, Kah-Wee Ang
Summary: Artificial synapses based on 2D materials have the potential to mimic biological synaptic plasticity for brain-like computation. Different structures and physical mechanisms of these devices are discussed, along with their potential applications in neuromorphic computing. The field shows promising prospects for significant advancements.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2022)
Article
Engineering, Chemical
Chaolang Chen, Lei Chen, Ding Weng, Shuai Chen, Jian Liu, Jiadao Wang
Summary: In this study, superwetting fibrous membranes were designed for separating surfactant-free water-in-oil emulsions and their separation mechanism was revealed. The designed membranes showed high permeation flux and separation efficiency, demonstrating great potential for industrial applications.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Shuai Chen, Zachary H. Aitken, Viacheslav Sorkin, Zhi Gen Yu, Zhaoxuan Wu, Yong-Wei Zhang
Summary: MEAM potentials have been widely used in MD simulations to describe interatomic interactions in metallic systems, but conventional potentials have limitations for complex HCP metals. New MEAM potentials for Mg, Co, and Ti show better performance in reproducing relevant properties and enabling accurate MD simulations.
ADVANCED THEORY AND SIMULATIONS
(2022)
Article
Chemistry, Multidisciplinary
Yesheng Li, Shuai Chen, Zhigen Yu, Sifan Li, Yao Xiong, Mer-Er Pam, Yong-Wei Zhang, Koh-Wee Ang
Summary: This paper presents a low-voltage memristor array based on an ultrathin PdSeOx/PdSe2 heterostructure switching medium, which solves the problem of random ion transport in traditional memristors, achieving remarkable uniform switching with low variability. Convolutional image processing with high recognition accuracy was also achieved by using various crossbar kernels.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
V Sorkin, Z. G. Yu, S. Chen, Teck L. Tan, Z. H. Aitken, Y. W. Zhang
Summary: This study presents a high fidelity, high throughput method for fast screening of high entropy alloys. By using the preselected small set of ordered structures method, the formation energies and mass densities of a large number of compositions were accurately calculated and the most stable ones were selected for further analysis. The method was validated against experimental data and found to outperform the special quasi-random structures method in terms of efficiency.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Shuai Chen, Tian Wang, Xiaoyan Li, Yuan Cheng, Gang Zhang, Huajian Gao
Summary: The effects of elemental concentration, short-range ordering, and atomic segregation on the melting temperature of high-entropy alloys (HEAs) were studied. It was found that the melting temperature of HEAs increases with decreasing Cu concentration, and Cu atoms tend to break bonds more readily during heating. The reduced melting temperature is attributed to the formation of more short-range ordering and atomic segregation with increasing Cu concentration.
Article
Physics, Applied
Chao Zhang, Xinxin Wang, Shuai Chen, Yong-Wei Zhang
Summary: Concentrated solid-solution alloys (CSAs) are a new type of alloy material with high strength, extreme hardness, remarkable corrosion resistance, and excellent radiation resistance. The mechanical properties of CSAs are strongly determined by the types and concentration of component elements, which provide a large space for design.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Mehrdad T. Kiani, Judy J. Cha
Summary: This Perspective discusses the use of nanomolding to fabricate topological nanowires, which offers scalability and high throughput fabrication, producing defect-free single crystalline nanowires with high aspect ratios.
Article
Chemistry, Multidisciplinary
Dingbo Zhang, Ke Wang, Shuai Chen, Lifa Zhang, Yuxiang Ni, Gang Zhang
Summary: Based on ab initio calculations and the phonon Boltzmann transport equation, this study found that magnetic phase transitions can significantly change the thermal conductivity of monolayer MnPS3. The study sheds light on the understanding of phonon thermal conductivity in 2D magnets and provides a practical method for the realization of 2D thermal switching devices. It has a broad range of novel applications including energy conversion and thermal management.
Article
Physics, Applied
Jian Zhang, Haochun Zhang, Shuai Chen, Gang Zhang
Summary: This study systematically investigates the phonon localization effect and heat flux regulation using a silicon nanofilm with a periodic array of nanopillars as an example. The results show that the phonon localization effect generated by the nanopillars is mainly concentrated near the surface layer. The effects of nanopillar height, spacing, and atomic mass on the localization are also explored, and the relationship between phonon localization and heat flux density is demonstrated. This research provides valuable insights into the design of nanoscale heat flux regulation devices and a better understanding of the phonon resonance hybridization mechanism in nanophononic metamaterials.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Mechanical
Wanghui Li, Shuai Chen, Zachary Aitken, Yong -Wei Zhang
Summary: This study systematically investigates the shock-induced deformation and fracture behavior of single-crystalline and nanocrystalline CoCrFeMnNi high-entropy alloys (HEAs) under different shock intensities using large-scale molecular dynamics simulations. The research reveals the strong anisotropy in single-crystalline HEAs and how the reversibility of HCP-structured atoms affects void nucleation and growth. Additionally, the study analyzes the effects of SRO and chemical heterogeneity on the shock response in CoCrFeMnNi HEAs. The comprehensive and systematical findings provide deep insights into the deformation and fracture mechanisms and contribute to the rational design of new HEAs/MEAs with enhanced performance.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Nanoscience & Nanotechnology
Ping Liu, Shuai Chen, Qing-Xiang Pei, Zachary H. Aitken, Wanghui Li, Yong-Wei Zhang
Summary: This study investigates the mechanical properties of AlxCoCuFeNi HEAs composites reinforced with AlNi3 nanoparticles using large-scale molecular dynamics simulations. The results show that the AlNi3 nanoparticles can enhance the ultimate tensile strength and ultimate tensile strain of the composite by suppressing phase change and dislocation appearance in the HEA matrix. The study also reveals the underlying reason for the lower-bound relation between Young's modulus, ultimate tensile strength, and ultimate tensile strain by following the rule of mixtures.
Article
Multidisciplinary Sciences
Shuai Chen, Ping Liu, Qingxiang Pei, Zhi Gen Yu, Zachary H. Aitken, Wanghui Li, Zhaoxuan Wu, Rajarshi Banerjee, David J. Srolovitz, Peter K. Liaw, Yong-Wei Zhang
Summary: This study constructs nanolamellar high-entropy alloys and explores their mechanical properties using molecular dynamic simulation and density functional theory calculation. The results show that the nanolamellar structure exhibits ideal plastic behavior and remarkable shape memory effect, highlighting the importance of nanolamellar structures in controlling the mechanical and functional properties of high-entropy alloys.
Article
Chemistry, Multidisciplinary
Mehrdad T. Kiani, Quynh P. Sam, Yeon Sik Jung, Hyeuk Jin Han, Judy J. Cha
Summary: With shrinking dimensions in integrated circuits, sensors, and functional devices, there is a need to develop nanofabrication techniques with simultaneous control of morphology, microstructure, and material composition over wafer length scales. This study extends the thermomechanical nanomolding (TMNM) technique for wafer-scale fabrication of 2D nanostructures. Nanomolded structures with high aspect ratio and single-crystal Cu were successfully achieved, and the deformation mechanism during molding is discussed based on the retained microstructures.
Article
Chemistry, Multidisciplinary
Ke Wang, Kai Ren, Yuan Cheng, Shuai Chen, Gang Zhang
Summary: In this study, we investigated the effect of molecular adsorption on the magnetic anisotropy and intralayer Dzyaloshinskii-Moriya interaction (DMI) of monolayer MnPS3. We found that molecular adsorption can enhance the magnetic anisotropy and induce significant DMI in 2D magnets. The enhancement of magnetic anisotropy mainly originates from structural deformation, while the presence of a new 'bridge' super-exchange interaction between Mn ions and adsorbed molecules contributes to the increased DMI.
MATERIALS HORIZONS
(2022)
