Article
Chemistry, Physical
Jianning Zhang, Yong Jiang, Zhengqing Liu, Yiren Wang
Summary: A two-step method based on first-principles was proposed to predict the temperature-dependent segregation behaviors of solutes at grain boundaries. The method was validated by experimental results and applied to a series of alloying elements in ferrite alloys. The calculation results showed that the equilibrium weight-averaged grain boundary concentrations followed a specific ordering and decreased slowly with temperature. The segregation of certain elements had significant effects on grain boundary adhesion strength, while others had minimal impacts.
SURFACES AND INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Joseph Messina, Renjie Luo, Ke Xu, Guanghong Lu, Huiqiu Deng, Mark A. Tschopp, Fei Gao
Summary: Magnesium alloys have advantages in applications due to their high strength-to-weight ratio, but properties like corrosion resistance, formability, and creep are still concerns, especially in magnesium-aluminum alloys. This study quantifies aluminum segregation energetics at grain boundaries using atomistic simulations, showing that the segregation of aluminum is influenced by grain boundary structure and the local atomic environment, which has broad implications for grain boundary science and engineering.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Mechanical
Zhi Zhang, Jinghuai Zhang, Jinshu Xie, Shujuan Liu, Wei Fu, Ruizhi Wu
Summary: By introducing beneficial solute to achieve grain boundary segregation and reducing the critical resolved shear stress (CRSS) ratio, we obtained a Mg-0.3Er alloy with moderate-fine grains and high ductility. This study not only provides an effective way for large-scale development of high ductility Mg alloys at room temperature, but also reveals the origins of ultrahigh ductility by examining the fraction of non-basal slips and the level of grain boundary segregation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Multidisciplinary Sciences
Cong He, Zhiqiao Li, Houwen Chen, Nick Wilson, Jian-Feng Nie
Summary: The authors report an unusual solute segregation phenomenon in a group of Mg alloys driven by chemical bonding, where solute atoms larger than Mg segregate to compression sites of specific fully coherent twin boundary.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Chiharu Kura, Masato Wakeda, Kazushi Hayashi, Takahito Ohmura
Summary: In this study, molecular static simulations were used to investigate the absorption of a screw dislocation with a Burger's vector perpendicular to the grain boundary normal and corresponding symmetric tilt grain boundaries (STGBs) in BCC-Fe. The interaction between the STGB and screw dislocation was found to depend on the energetical stability of the STGB against the GB shift along the Burgers vector direction. The findings revealed important insights into the strength and fracture of polycrystalline metals.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Pavel Lejcek, Siegfried Hofmann
Summary: The article discusses the possibility of entropy-driven grain boundary segregation, using model examples in iron-based systems. It is shown that this phenomenon represents a further development of entropy-dominated grain boundary segregation, involving solute segregation at anti-segregation sites.
Article
Chemistry, Physical
Lili Zhang, Yan Song, Linjie Yang, Jiuzhou Zhao, Jie He, Hongxiang Jiang
Summary: The synergistic effect of TiB2 (in the form of Al-5Ti-1B) and La on grain refining in Al-2Cu alloy was investigated. The addition of Al-5Ti-1B significantly refines alpha-Al grains, and further refinement is achieved with the addition of trace La. Satisfactory grain refining results are achieved when the La addition level reaches 600 ppm.
Article
Materials Science, Multidisciplinary
S. Chandra, M. K. Samal, N. N. Kumar, V. M. Chavan
Summary: Crystal plasticity finite element simulations were used to analyze the effect of grain size on the stress-strain curve of FCC type Ni based alloy 690. The results showed that accurate modeling of grain boundaries can successfully predict the Hall-Petch effect.
Article
Nanoscience & Nanotechnology
Megan J. McCarthy, Timothy J. Rupert
Summary: This study investigates the migration behavior of a faceted Sigma 11 boundary in Cu doped with Ag atoms, revealing that solute atoms segregate to a facet with more free volume and greatly reduce boundary velocity in one migration direction. However, a directionally-dependent motion mechanism can escape solute pinning and speed up migration in the other direction, uncovering a new mechanism of chemically-induced anisotropy in grain boundary mobility.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Jingliang Wang, Hao Hong, Anran Huang, Xiang Yang, Rongtao Qian, Chengjia Shang
Summary: Different hierarchical bainitic/martensitic microstructures were obtained by varying the cooling rates for low-carbon steels with different Nb concentrations, revealing a close relationship between high angle grain boundaries (HAGBs) and hardness. Using a machine learning model, grain boundaries were further categorized by their crystallographic features, and it was found that block boundary density has a significant linear relationship with hardness.
Article
Materials Science, Multidisciplinary
Zhixin Shen, Lingying Ye, Xiaodong Liu, Yu Dong
Summary: To achieve high strain rate superplasticity, fine-grained aluminum alloy is typically prepared through severe plastic deformation such as equal channel angular pressing. In this study, a traditional thermo-mechanical processing method was used to produce Al-Cu-Li alloy with an average grain size of 3.1 μm. The alloy exhibited a maximum elongation of 1220% at a high strain rate of 1 x 10-2 s-1 and 490 degrees C. The presence of stabilized fine grains and nano-scaled Al3Zr particles was identified as the cause for the high strain rate superplasticity, as they inhibited the dynamic growth of grains. Additionally, the calculated deformation activation energy and m values indicated the active mechanism of grain boundary sliding.
Article
Multidisciplinary Sciences
Lihua Wang, Yin Zhang, Zhi Zeng, Hao Zhou, Jian He, Pan Liu, Mingwei Chen, Jian Han, David J. Srolovitz, Jiao Teng, Yizhong Guo, Guo Yang, Deli Kong, En Ma, Yongli Hu, Baocai Yin, XiaoXu Huang, Ze Zhang, Ting Zhu, Xiaodong Han
Summary: Grain boundaries (GBs) are crucial for the mechanical behavior of polycrystalline materials, yet the atomic-scale dynamic processes of GB deformation remain unclear. This study presents an in situ atomic-resolution investigation on how sliding-dominant deformation occurs at general tilt GBs in platinum bicrystals, involving direct atomic-scale sliding and sliding with atom transfer across the boundary plane.
Review
Crystallography
James C. M. Li, C. R. Feng, Bhakta B. Rath
Summary: The Frank-Read model is widely accepted for generating dislocations in metals and alloys, but Li proposed an alternate mechanism of grain boundary sources for dislocations. The article reviews Li's model, supporting evidence, and the role of grain boundary sources in nanomaterials.
Article
Chemistry, Physical
Lei Wang, Reza Darvishi Kamachali
Summary: The desire for developing high-entropy alloys has raised concerns about their safe application. This study investigates the co-segregation phenomena in multi-component alloys and quantitatively simulates the grain boundary spinodal decomposition. The concept of co-segregation maps is also introduced for grain boundary segregation screening and design in multi-component alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Zhong Li, Jianing Qi, Zhuangzhuang Li, Hongxia Li, Hui Xu, Guohua Bai, Xianguo Liu, Xuefeng Zhang
Summary: The magnetic domain structure and soft magnetic properties of high-entropy alloys FeCoNi(AlSi)x (0.1 <= x <= 0.7) are influenced by grain and phase boundaries. The variations in grain and phase boundaries in different alloys affect their magnetic properties differently.
Article
Materials Science, Ceramics
Ting Wang, X-L Wang, S-H Song, Qing Ma
CERAMICS INTERNATIONAL
(2020)
Article
Electrochemistry
Jingwei Wang, Guohua Chen, Shenhua Song
ELECTROCHIMICA ACTA
(2020)
Article
Engineering, Electrical & Electronic
Jianghe Liu, Zeba Khanam, Ravi Muchakayala, Shenhua Song
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2020)
Article
Nanoscience & Nanotechnology
Yu Guo, Kai Wang, Shenhua Song
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2020)
Article
Polymer Science
Jianghe Liu, Sultan Ahmed, Zeba Khanam, Ting Wang, Shenhua Song
Article
Electrochemistry
Zeba Khanam, Jianghe Liu, Shenhua Song
ELECTROCHIMICA ACTA
(2020)
Article
Materials Science, Multidisciplinary
Yu Guo, Yu Zhao, Shenhua Song
Article
Chemistry, Physical
Jianghe Liu, Zeba Khanam, Sultan Ahmed, Hengtai Wang, Ting Wang, Shenhua Song
Summary: A novel gel polymer electrolyte (GPE) membrane based on the PVdF-HFP/EMITf/Al(Tf)(3) system has been developed with high ionic conductivity and wide electrochemical stability window, showing outstanding performance under different temperatures.
JOURNAL OF POWER SOURCES
(2021)
Article
Nanoscience & Nanotechnology
Jianghe Liu, Zeba Khanam, Sultan Ahmed, Ting Wang, Hengtai Wang, Shenhua Song
Summary: The gel electrolyte based on the PVA/Zn/ethylene glycol system shows high ionic conductivity and excellent antifreezing performance. The antifreezing Zn-ion hybrid supercapacitor fabricated with this gel electrolyte exhibits outstanding electrochemical properties and cyclic stability, even under low temperatures, demonstrating its potential for flexible energy storage devices in subzero-temperature environments.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Zeba Khanam, Jianghe Liu, Shenhua Song
Summary: Efficient, facile, and scalable production of graphene dispersions is achieved by exfoliating graphite in an environment-friendly PVA/H2O solvent system. High-quality graphene flakes are obtained with a high concentration through systematic investigation of processing parameters. The PVA-stabilized graphene dispersion shows promising potential for commercial viability in various applications.
JOURNAL OF NANOPARTICLE RESEARCH
(2021)
Article
Engineering, Mechanical
T. C. Wang, Y. Guo, X. M. Chen, K. Wang, S. H. Song
Summary: In this study, the coarse-grained heat-affected zone (CGHAZ) of P-doped SA508Gr.4N steel was simulated, and the effects of residual stress and P grain-boundary segregation on fracture nature were investigated. It was found that annealing treatment could improve the toughness of the specimen to a certain extent, but the boundary cohesion would decrease. Furthermore, the variation of ageing temperature also affected the fracture properties of the specimen.
ENGINEERING FAILURE ANALYSIS
(2022)
Review
Materials Science, Multidisciplinary
Tingdong Xu, Kai Wang, Shenhua Song
Summary: The measurement uncertainty in tensile testing results from the influence of temperature and strain rate variations on the microstructure at atomic level, leading to changes in mechanical properties. A new technology system proposes using a mechanical property-tensile strain rate curve to evaluate the original mechanical property, with a higher strain rate yielding results closer to the original property. This technology system could potentially revolutionize the conceptual framework and testing technology system of metallic mechanics.
Article
Materials Science, Multidisciplinary
Kai Wang, Yu Guo, Shenhua Song
Summary: The study focuses on investigating the non-hardening embrittlement caused by grain boundary segregation of P in a P-doped SA508-4 N steel through impact testing in conjunction with Auger electron spectroscopy and microstructural characterization. Results show a linear dependence of DBTT on the boundary concentration of P when steel hardness is fixed. A time-temperature embrittlement diagram is developed based on the DBTT-segregation relation, which can be used to predict embrittlement tendency in the steel.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Jianghe Liu, Zijian Ye, Xingcheng Hu, Sultan Ahmed, Shenhua Song
Summary: The scarcity of lithium and its uneven distribution on Earth has posed a challenge in electrochemical energy storage, but replacing lithium with sodium, which is abundant and low-cost, shows promise. By synthesizing Na-ion conducting gel polymer membranes, the electrical and electrochemical properties of membranes can be optimized for potential applications in future sodium-ion energy storage devices.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yu Guo, Yu Zhao, Kai Wang, Shenhua Song
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2020)
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)
