Article
Materials Science, Multidisciplinary
Changqing Ye, Guisen Liu, Kaiguo Chen, Jingnan Liu, Jianbo Hu, Yuying Yu, Yong Mao, Yao Shen
Summary: This study investigates the influence of strain rate and dislocation density on the strength and the corresponding hardening or softening effect using a newly developed crystal plasticity model. The results show that the material strength first softens and then hardens as the dislocation density increases, and the critical dislocation density separating the softening from hardening regimes increases with the strain rate. The study provides valuable insights into the strength evolution under different serving conditions and can guide material design accordingly.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Wensen Huang, Jihua Chen, Hongge Yan, Weijun Xia, Bin Su
Summary: By observing the microstructure evolution of Mg-Ga alloy during tensile deformation, it was found that the addition of Ga promotes the activation of non-basal slip, enhancing the work-hardening and plasticity of the alloy. The preparation method of high strain rate rolling (HSRR) is also an important factor for improving the ductility of magnesium alloy sheets.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
T. Katiyar, E. Van der Giessen
Summary: Two-dimensional discrete dislocation plasticity (2D-DDP) is a powerful tool for studying microplasticity problems, with challenges in modifying the dislocation evolution rules for different crystal structures and mapping different dislocation mobilities to an effective mobility. A proposed 3D-to-2D procedure allows for the computation of effective 2D mobility for BCC materials based on their edge and screw mobilities, validated by comparing predicted rate sensitivity with experimental results for polycrystalline iron.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Mechanics
Wen An, Zhaoquan Zeng, Qi-lin Xiong, Minsheng Huang, Zhenhuan Li
Summary: The stress overshoot phenomenon and its mechanism during high-strain rate deformation of metals are investigated using crystal plasticity finite element simulation. A constitutive model is adopted to simulate crystal anisotropic properties and deformation at different strain rates. The effects of strain rate, temperature, and crystal orientation on stress overshoot are studied and the corresponding physical mechanism is analyzed. Results show that both strain rate and temperature significantly influence stress overshoot and all crystal orientations exhibit this phenomenon.
Article
Materials Science, Multidisciplinary
Sh. Akhondzadeh, Minju Kang, Ryan B. Sills, K. T. Ramesh, Wei Cai
Summary: A long-standing challenge in computational materials science is to establish a quantitative connection between macroscopic properties of plastic deformation and microscopic mechanisms of dislocations in crystalline materials. This study provides direct comparisons between stress-strain curves obtained from miniaturized bar experiments and those from discrete dislocation dynamics (DDD) simulations. The DDD simulations show good agreement with experimental results, but the required dislocation mobility values are significantly lower than expected. Cross-slip of screw dislocations is also found to be necessary to capture the experimental stress-strain behavior.
Article
Physics, Applied
Yuming Qi, Tengwu He, Miaolin Feng
Summary: The impact of chemical compositions on the mechanical properties and microstructure evolution of single-crystal FCC CoCrFeNi-based high-entropy alloys was investigated through molecular dynamics simulation in nanoindentation. The addition of Cu and Mn elements influences the stacking faults energy and dislocation-mediated deformation. The total number of chemical compositions plays a critical role in the results, showing significant effects on plastic deformation, indentation force and hardness of the high-entropy alloys.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Zachary Barringer, Jie Jiang, Xiaowen Shi, Elijah Schold, Anastasios Pateras, S. Cipiccia, C. Rau, Jian Shi, Edwin Fohtung
Summary: The defects in V2O3 grown via a flux method were studied, revealing large flake-like particles with spiral growth characteristics and smaller particles without the characteristic screw dislocation of spiral growth. The identification and measurement of various defects were done using Bragg coherent diffractive imaging.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Engineering, Multidisciplinary
K. J. Juul, K. L. Nielsen, C. F. Niordson
Summary: A numerical framework for analyzing steady-state elastic-plastic material deformation at finite strains has been developed, providing an efficient and accurate method to extract steady-state solution. The framework offers advantages over traditional Lagrangian procedures and is important for manufacturing processes involving significant strains.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Engineering, Mechanical
Pratyush Srivastava, Katherine Jiang, Yinan Cui, Edgar Olivera, Nasr Ghoniem, Vijay Gupta
Summary: Experimental results show that reducing sample size can decrease the strain rate sensitivity of plastic flow, including flow stress and strain burst statistics. Nano-sized samples exhibit more stable scaling effects, while micron-sized samples show truncated scaling effects.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Nanoscience & Nanotechnology
Adib Salandari-Rabori, Bradley J. Diak, Vahid Fallah
Summary: This study systematically investigated the relationship between plasticity and strain rate for AlSi10Mg laser powder bed fusion samples, revealing a strong dependence of flow stress on strain rate. The compressive yield stresses showed significant sensitivity to strain rate in different stress states. Additionally, a negative strain rate sensitivity was observed within a certain range of strain rates, which was correlated with microstructural changes.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Environmental
B. Ma, J. L. Hayley, J. A. Priest
Summary: This study investigates the behavior of methane hydrates under pressure and strain conditions in the Arctic region. The results reveal that the strain rate of methane hydrates affects their compressive strength and behavior. Specimens with high slenderness ratios tend to experience brittle buckling failure under high strain rates, while specimens with low slenderness ratios exhibit more ductile behavior under low strain rates. Under constant stresses, the hydrates undergo plastic deformation, with low slenderness ratio specimens showing extensive cracking and shear dislocations, and high slenderness ratio specimens experiencing large out-of-plane deformations. The study also finds that hydrate veins hinder sediment consolidation, especially at shallow burial depths.
COLD REGIONS SCIENCE AND TECHNOLOGY
(2022)
Article
Mechanics
Yan Wang, Hui Wu, Lizhong Sun, Wenjuan Jiang, Chunsheng Lu, Zengsheng Ma
Summary: This study presents a new model coupling the electrochemical reaction with strain gradient plasticity to analyze the evolutions and distributions of electrochemical-reaction dislocations and diffusion-induced stress during lithiation process. The research shows that microstructure evolution can impact the mechanical properties and electrochemical performances of electrode materials, and the lithiation reaction displays a strong size effect.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Construction & Building Technology
Ziwei Dai, Vikram Laheri, Xingyi Zhu, Francisco A. Gilabert
Summary: The research utilizes dynamic mechanical analysis to investigate the mechanics of asphalt matrix, revealing asymmetry between compression and tension properties, with properties highly dependent on strain rate. Creep tests and amplitude and frequency sweep tests show that asphalt matrix has inherent self-healing capabilities.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Multidisciplinary
James Pheysey, Francesco De Cola, Antonio Pellegrino, Francisca Martinez-Hergueta
Summary: Short fibre and hybrid carbon fibre PEEK composite materials were tested under different temperature and strain rate conditions, and the effects of hybridization on mechanical properties were observed.
COMPOSITES PART B-ENGINEERING
(2024)
Article
Nanoscience & Nanotechnology
Yao Chen, Shijian Wang, Haizhou Li, Yongjie Liu, Chao He, Jie Cui, Qing Jiang, Chang Liu, Qiyuan He, Quanwei Liang, Lang Li, Qingyuan Wang
Summary: This study systematically explores the subsurface cracking at the inner matrix from the mesoscale to the atomic scale. The results suggest that subsurface cracking initiates from a single coarse lath and is associated with the localized plastic deformation zones near alpha-Fe nanoprecipitates. It is proposed that the nucleation of interfacial microcracks at the nanoprecipitate/alpha-Fe interfaces, along with their coalescence into a trans-granular crack, is the mechanism for crack initiation within the coarse lath.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Multidisciplinary
Pan Zeng, Hao Zou, Chen Cheng, Lei Wang, Cheng Yuan, Genlin Liu, Jing Mao, Ting-Shan Chan, Qingyuan Wang, Liang Zhang
Summary: A cascade catalysis concept based on a ternary heterostructure is proposed to achieve the tandem reduction of Li2S8 to Li2S. The ternary heterostructure Na0.67Ni0.25Mn0.75O2(NNMO)-MnS2-Ni3S4 successfully integrates three types of active centers into one structure to realize cascade catalysis. The NNMO-MnS2-Ni3S4/S composite electrode exhibits excellent rate performance and high restraining ability toward the polysulfide shuttle under long cycling, high sulfur loading and low electrolyte conditions.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Energy & Fuels
Yiming Jiang, Xuhai Pan, Min Hua, Zhilei Wang, Tao Zhang, Qingyuan Wang, Yunyu Li, Andong Yu, Juncheng Jiang
Summary: This paper investigates the impact of flow directions in T-shaped tubes on over-pressure, shock wave, and spontaneous ignition. The results show that although the evolution of upstream pressure is not significantly different, the flow features in the trunk and branch pipelines downstream of the bifurcation point vary significantly. Additionally, the flow direction affects the critical release pressure required for self-ignition.
Article
Chemistry, Physical
Jia Liu, Xuguang An, Jing Zhang, Qingquan Kong, Qiangguo Li, Hui Wang, Weitang Yao, Qingyuan Wang
Summary: The effects of Al/Mo content on phase, microstructure, mechanical and corrosion properties of AlxCrFeNi2.5Mo1-x high-entropy alloys were investigated. With the increase of Al content, the alloy phases evolved from FCC + sigma phase to FCC + BCC + sigma phase and finally to FCC + BCC phase, and the microstructure transformed from hypoeutectic to hypereutectic. Among all the alloys, Al1.0CrFeNi2.5 alloy exhibited excellent comprehensive mechanical properties. Additionally, Mo element improved the pitting corrosion resistance but promoted the formation of sigma phase, leading to an uneven distribution of Cr elements and reduced resistance to localized corrosion.
Article
Engineering, Mechanical
Qing-Yun Deng, Shun-Peng Zhu, Xiaopeng Niu, Grzegorz Lesiuk, Wojciech Macek, Qingyuan Wang
Summary: This study defines a simple and applicable method to quantify the effect of non-proportional loading on fatigue life and proposes a new fatigue damage parameter. Experimental data validation shows that this method effectively evaluates the multiaxial fatigue life of materials under non-proportional loadings.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Hong Zhang, Dong Lu, Yubing Pei, Tan Chen, Tongfei Zou, Tianjian Wang, Xiaoyan Wang, Yongjie Liu, Qingyuan Wang
Summary: Uniaxial tensile experiments were conducted at various temperatures to evaluate the tensile behavior, microstructural evolution, and deformation mechanisms of Ti-45Al-8Nb alloy manufactured by electron beam melting. The results showed that temperature has a significant effect on tensile behavior and flow stress. The transition temperature from brittle to ductile fracture for this alloy is between 700 and 750 degrees Celsius. Below this temperature, fracture occurs mainly through trans-granular mechanisms, leading to brittle failure. Above this temperature, fracture transforms to a mixed mode of trans-granular and ductile dimples. Dynamic recovery and recrystallization play a key role in the softening behavior observed. The Chaboche model was used to describe the tensile inelastic behavior at different temperatures.
MATERIALS & DESIGN
(2023)
Article
Construction & Building Technology
Hongen Zhang, Bei He, Xinping Zhu, Qingyuan Wang, Zhengwu Jiang
Summary: This study investigates the flexural performance of ultra-high performance concrete (UHPC) under different temperature conditions. The results show that the in-situ-170℃ condition enhances flexural strength and toughness due to frozen water and improved bond strength. A non-linear relationship between deflection and flexural strength is observed at different temperatures. The presence of shear cracks in the linear-elastic stage is attributed to the fracture process of frozen water. Cryogenic-induced ductility degradation is observed in the flexural behavior of UHPCs, which is attributed to higher energy release rate. Pre-exposure to 200℃ reduces the positive influence of cryogenic temperature and the negative effect of cryogenic temperature on ductility due to initiated cracks around steel fibers.
CEMENT & CONCRETE COMPOSITES
(2023)
Article
Engineering, Mechanical
Yu-Huai Xie, Qiang Liu, Shun-Peng Zhu, Haihe Sun, Yun He, Qingyuan Wang
Summary: In this study, a novel model for turbine disk burst speed assessment is proposed, which utilizes the average stress approach and introduces the notch strength ratio and stress triaxiality parameter to characterize the stress field and stress state. The model is validated and compared using disk overspeed test data, and it is found to match the experimental results well. Furthermore, a probabilistic framework is developed to account for material property dispersion, and the model is extended to a probabilistic one. Finally, the relationship between safety margin and reliability index is established, providing a reference for reliability-based design and evaluation of turbine disk.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Chemistry, Physical
Xin Li, Qingquan Kong, Xuguang An, Jing Zhang, Qingyuan Wang, Weitang Yao
Summary: We propose a synergistic strategy of titanium doping and surface coating to modify the Na-rich manganese-oxide-based cathode material in sodium-ion batteries, resulting in enhanced electrochemical performance. The optimized Ti doping amount is found to be x = 0.3. Additionally, the cathode material coated with a manganese-rich shell exhibits excellent electrochemical performance, with a discharge capacity of 169 mAh/g and a capacity retention rate of 71% after 500 charge-discharge cycles. The Ti doping and surface coating with a Mn-rich shell improve the specific discharge capacity, cycling stability, rate capability, and mitigate voltage decay.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Zhijun Wang, Che Liao, Chi Yang, Xinchun Mao, Huazhou Zhang, Ge He, Fujun Gou, Kun Zhang, Feng Zhao, Zongbiao Ye, Qingyuan Wang
Summary: Due to its direct activation of reactant species, plasma has been widely used in surface engineering, especially for the production of nano-materials. In this study, molybdenum-derived nano-fiber films were synthesized using a thermal plasma method under the irradiation of dense helium plasma. The surface composition of the films could be controlled to produce molybdenum nitrides or molybdenum oxides while maintaining the nanofiber structure. The Mo nano-fiber film with an amorphous MoOx layer on the surface showed a strong SERS effect for the Raman detection of Rhodamine 6G molecule, significantly improving the detection limit.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Engineering, Environmental
Yiming Jiang, Xuhai Pan, Tao Zhang, Zhilei Wang, Xilin Wang, Qingyuan Wang, Yunyu Li, Min Hua, Juncheng Jiang
Summary: This paper investigates the shock waves and self-ignition in tubes with T-shaped structure. The study reveals that the shock wave intensity decreases after passing through the T-shaped region and is lower in the branch pipeline. The flow field becomes extremely complex after shock waves enter the T-shaped region, exhibiting different shockwave structures and multiple reflections.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2023)
Article
Nanoscience & Nanotechnology
Chuanlong Xu, Mingyi Zhang, Xiaobao Tian, Wentao Jiang, Qingyuan Wang, Haidong Fan
Summary: The interaction between Mg17Al12 precipitate and low-angle grain boundaries in Mg-Al alloys was investigated using molecular dynamics simulations. The precipitate was found to be sheared by grain boundaries with a rotation angle of 9 degrees or larger, but not sheared with a rotation angle smaller than 8 degrees. An analytical model based on Eshelby theory was proposed to explain this behavior, and it showed good agreement with the simulation results. The critical shear of the grain boundary was found to be related to the aspect ratio of the precipitate.
SCRIPTA MATERIALIA
(2023)
Article
Polymer Science
Hongping Zhang, Pengfei Tang, Youhong Tang, Kun Yang, Qingyuan Wang
Summary: The penetration of external stimuli is the main reason for the deterioration of cement and concrete structures. A protective coating based on phenol and Ti3C2 MXene-modified polyacrylate (MXene-PG/PA) was developed to address this challenge. The MXene-PG/PA coating exhibited good waterproof and antimicrobial properties, making it a potential candidate for protective coating for cement-based materials.
Review
Construction & Building Technology
Yunhui Pu, Lang Li, Xiaoshuang Shi, Qingyuan Wang, Abdelfatah Abomohra
Summary: This article provides a comprehensive summary of the research status, mechanisms, and application effects of accelerated carbonation in the life cycle of cement-based materials. It discusses various methods and strategies to enhance carbonation efficiency. The review also analyzes CO2 mitigation potential, research gaps, and future perspectives. The findings show that carbonation reactions can extract high-purity calcium carbonates from cement-based wastes and valorize them as high-quality recycled aggregates. CO2 curing can improve compressive strength and durability, while different accelerated carbonation methods have distinct advantages in industry practice.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Engineering, Chemical
Hongping Zhang, Pengfei Tang, Kun Yang, Qingyuan Wang, Wei Feng, Youhong Tang
Summary: A porous hydrogel (T-PMADA) was prepared by copolymerizing acrylic acid (AA) and methacrylamide dopamine (MADA) in the presence of Ti3C2 MXene. The porous structure increased the specific surface area of the hydrogel and provided active sites for pollutant treatment, leading to high adsorption capacities for Pb (II) and Cd (II). Additionally, the hydrogel exhibited photocatalytic degradation ability for organic dyes. It showed good performance in treating wastewater containing heavy metal ions and organic dyes, indicating its potential for water pollution treatment in complex environments.