Letter
Materials Science, Multidisciplinary
Yu Han, Huabing Li, Hao Feng, Kemei Li, Yanzhong Tian, Zhouhua Jiang
Summary: Nitrogen was found to transform the TRIP alloy into a TWIP alloy, leading to improved strength and elongation. The nitrogen-doped HEA exhibited high yield strength due to the interstitial strengthening effect and high ductility from the retained strain-hardening capability.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Matias Bordone, Juan Perez-Ipina, Raul Bolmaro, Alfredo Artigas, Alberto Monsalve
Summary: This article focuses on the mechanical behavior and microstructural changes observed in two high-manganese steels with different carbon contents, impacting the TWIP and TRIP effects. Tensile tests revealed distinct fracture micro-mechanisms in the two steels.
Article
Nanoscience & Nanotechnology
Min Chul Jo, Min Cheol Jo, Alireza Zargaran, Seok Su Sohn, Nack J. Kim, Sunghak Lee
Summary: Austenitic high-Mn steels exhibit a combination of twinning-induced plasticity (TWIP) and transformation-induced plasticity (TRIP) mechanisms, with partial recrystallization enhancing yield strength achieved by the precipitation of (V + Mo) complex carbides. Adding aluminum alloy can increase yield strength and achieve 1 GPa of yield strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
A. K. Chandan, P. T. Hung, K. Kishore, M. Kawasaki, J. Chakraborty, J. Gubicza
Summary: The severe plastic deformation response of a face centered cubic twinning induced plasticity high entropy alloy subjected to high-pressure torsion was investigated. The study found that the alloy demonstrated an extensive transformation induced plasticity effect and nano-structuring with heavily dislocated structure during HPT processing. The research also quantified the fraction of c c+a dislocations and discussed their evolution in the studied alloy.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Mikhail Seleznev, Nico Kaden, Christoph Renzing, Matthias Schmidtchen, Ulrich Prahl, Horst Biermann, Anja Weidner
Summary: In this study, a four-layered laminate made of X5CrMnNi-16-6-6 (TRIP steel) and X5CrMnNi16-6-9 (TWIP steel) was successfully manufactured by accumulative roll bonding (ARB). The microstructure analysis revealed that the grain size and microhardness of the steel layers changed after repeated rolling and annealing, while significant texture appeared only after tensile loading. The ductile deformation lenses in the laminate ensured excellent bonding and microcrack blunting. As a result, the TRIP-TWIP laminate exhibited remarkable mechanical properties with a high yield strength of up to 800 MPa and an elongation to failure of up to 45%.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Chengshuang Zhou, Dan Tang, Kaiyu Zhang, Fangyue Wu, Ping Lin, Yan Jin, Lin Zhang, Jinyang Zheng
Summary: The hydrogen embrittlement behavior of two stabilized austenitic TWIP steels under high-pressure thermal hydrogen charging and hydrogen environment were investigated. It was found that both TWIP steels showed a certain susceptibility to hydrogen embrittlement after hydrogen charging, with the TWIP steel with higher Mn content showing weaker hydrogen embrittlement.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Dong Geun Kim, Min Cheol Jo, Yong Hee Jo, Hyoung Seop Kim, Byeong-Joo Lee, Seok Su Sohn, Sunghak Lee
Summary: This study investigates the compressive properties of high entropy alloys under different conditions, revealing variations in deformation mechanisms based on Fe content, testing temperature, and loading rate. The stability of FCC and the activation of TWIP and TRIP modes are correlated to these factors, showing a systematic shift in deformation mechanisms.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
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
Engineering, Mechanical
Chengshuang Zhou, Bei Fang, Jing Wang, Dan Tang, Huimin Tao, Yanming He, Zhengrong Zhou, Changfeng Chen, Lin Zhang
Summary: The behavior of as-received and cold-rolled Fe-25Mn-10Ni-0.65C twinning-induced plasticity steel in hydrogen environment was studied using fatigue crack growth rate tests. It was found that TWIP steel exhibits weak hydrogen embrittlement susceptibility due to the formation of deformation twins at the crack tip. Cold rolling was shown to significantly improve the hydrogen embrittlement resistance and fatigue resistance of TWIP steel.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Amin Radi, Seyedvahid Sajadifar, S. Vegar Seyedmohammadi, Marcel Krochmal, Artjom Bolender, Thomas Wegener, Thomas Niendorf, Guney Guven Yapici
Summary: In this study, a multi-phase non-equiatomic FeCrNiMnCo high entropy alloy (HEA) was fabricated through vacuum induction melting. Thermo-mechanical treatments consisting of cold rolling and annealing were used to improve the mechanical properties of the alloy. Tensile experiments showed that the yield strength and ultimate tensile strength levels of the HEA can be significantly enhanced by the thermo-mechanical processing. Similarly, strain-controlled low-cycle fatigue experiments revealed that the processed samples had higher stress levels and fatigue lives compared to the as-received counterpart.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Junha Yang, Yong Hee Jo, Woojin An, Hyoung Seop Kim, Byeong-Joo Lee, Sunghak Lee, Hyokyung Sung, Seok Su Sohn
Summary: This study evaluated the fracture toughness of a metastable alloy at room and cryogenic temperatures and investigated the effects of deformation-induced martensitic transformation (DIMT) on fracture behavior. The results showed that high fracture toughness and ductile fracture mode were observed at room temperature, but the fracture toughness significantly decreased at cryogenic temperature. The morphology of the martensite had an impact on the fracture behavior, with the plate-type BCC martensite exhibiting lower toughness and brittle fracture mode compared to the lath-type BCC martensite.
Article
Materials Science, Multidisciplinary
Wenkai Fu, Yulan Li, Shenyang Hu, Peter Sushko, Suveen Mathaudhu
Summary: Through the study of crystal plasticity theory, it was found that in solid phase processing, regions with high misorientation and GND density first appear near grain boundaries and extend towards interior grains. The loading path affects plastic deformation accumulation and recovery, and thus affects dislocation evolution and misorientation.
COMPUTATIONAL MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
C. H. Wang, C. Y. Sun, L. Y. Qian, W. Cai, J. Jiang, Y. Xiao
Summary: The study investigates the dynamic mechanical behavior induced by adiabatic temperature rise of Fe-Mn-Al-C twinning-induced plasticity steel through dynamic tensile testing and a dynamic constitutive model. The results show that the more active twinning at higher strain rates contributes to plasticity, while the decreasing plasticity from dislocation slip leads to a low strain hardening rate. In the later stage, adiabatic heating promotes dislocation annihilation through enhanced dynamic recovery, resulting in negative rate-dependent hardening.
MATERIALS SCIENCE AND TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Dongdong Li, Lihe Qian, Chaozhang Wei, Shuai Liu, Fucheng Zhang, Jiangying Meng
Summary: The tensile properties, evolution of dislocation density, and twinning behavior of Fe-18Mn-1.0C and Fe-18Mn-0.6C twinning-induced plasticity steels were systematically investigated. Increasing the cold rolling reduction led to an obvious increase in yield strength and tensile strength, as well as a decrease in elongation to fracture. The dislocation density and amount of deformation twins increased with increasing rolling reduction and tensile strain. The contributions of lattice friction stress, dislocations, twins, and dynamic strain ageing to flow stress were analyzed, with dislocation strengthening and twin boundaries strengthening found to play a dominant role.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
C. D'Hondt, V Doquet, J. P. Couzinie
Summary: In situ tensile and reversed cyclic tests were conducted on a TWIP steel in a SEM, showing evidence of twinning/detwinning processes and their effects. It was observed that detwinning and retwinning occurred partially after load reversal, with stress variations close to twinning stress affecting the mechanical hysteresis of the material.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yongju Kim, Jaimyun Jung, Hyung Keun Park, Hyoung Seop Kim
Summary: The article introduces the purpose of studying bimodal structures and the importance of the microstructure-property linkage. It proposes a physical-based constitutive model to describe this linkage well. Microstructure-based finite element method simulations can further explore the performance of bimodal structures.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Olivier Bouaziz, Hyoung Seop Kim, Jungwan Lee, Yuri Estrin
Summary: This article presents a modeling approach for the Bauschinger effect, combining microstructure-based modeling with tensorial modeling in continuum mechanics. A microstructure-related model is developed and generalized to multiaxial loading, offering an advanced modeling tool for solid mechanics and physical metallurgy communities.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Wenke Wang, Jaimyun Jung, Chao Cui, Wenzhen Chen, Yang Yu, Peng Li, Wencong Zhang, Renlong Xiong, Hyoung Seop Kim
Summary: This work investigated the anisotropy variation of tensile flow stress for AZ31 magnesium alloys at different temperatures and tensile strains using the visco-plastic self-consistent model. The results showed that the anisotropy of flow stress weakened with increasing temperature and exhibited a slightly increasing stage followed by a continuously decreasing stage with increasing strain. Activation of basal slip and tension twinning contributed to the development of a (0002)//LD type texture during tension deformation, while activation of prismatic slip produced a < 10-10 >//LD type texture. The study found that the macroscopic average resolved shear stress decreased significantly with increasing temperature or strain, resulting in the decline of the tension deformation behavior anisotropy.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Engineering, Manufacturing
Taekyeong Kim, Jung Gi Kim, Sangeun Park, Hyoung Seop Kim, Namhun Kim, Hyunjong Ha, Seung-Kyum Choi, Conrad Tucker, Hyokyung Sung, Im Doo Jung
Summary: By optimizing conditional generative adversarial networks, virtual surface morphology can be generated with the use of artificial intelligence, helping to obtain high-quality parts cost-effectively.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
Article
Chemistry, Physical
Seong-June Youn, Young-Kyun Kim, Hyoung Seop Kim, Kee-Ahn Lee
Summary: The microstructure of the Ti4822 alloy, manufactured by EBM, was controlled through various heat treatment methods to improve mechanical properties at different temperatures. The results showed that Ti4822 with a thinner lamellar structure exhibited better mechanical properties and high ductility at room and high temperatures. Moreover, an increased fraction of the lamellar structure resulted in intensified yield stress anomaly and dynamic recrystallization.
Article
Chemistry, Physical
Hyojin Park, Nhung Thi-Cam Nguyen, Praveen Sathiyamoorthi, Sujung Son, Jongun Moon, Hyoung Seop Kim
Summary: In this study, the superplastic behavior and microstructural characteristics of the high pressure torsion-processed Al-15(CuFeMn)(85) immiscible medium-entropy alloy (IMMEA) were investigated. The multi-phase structure generated through spinodal-like decomposition in IMMEA played a key role in maintaining the ultra-fine structure and preserving an equiaxed shape during testing at high temperatures, ultimately leading to superplastic behavior. This study is the first IMMEA superplasticity study and these results contribute to a better comprehension of the phenomenon.
Article
Materials Science, Multidisciplinary
Sujung Son, Peyman Asghari-Rad, Jungwoo Choi, Aeree Kim, Jin-Hwan Jeong, Sungho Cho, Hyoung Seop Kim
Summary: New AlVCr medium-entropy alloys (MEAls) were developed by starting from an equiatomic V-Cr alloy. Al20VCr and Al33VCr MEAls formed body-centered cubic single-phases and exhibited good mechanical properties. This reverse approach can aid the development of lightweight high- and medium-entropy Al alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Jaemin Wang, Hyeonseok Kwon, Hyoung Seop Kim, Byeong-Joo Lee
Summary: A neural network model is developed to search the vast compositional space of high entropy alloys (HEAs) and predicts their mechanical properties better than other models due to its special structure and the utilization of thermodynamics descriptors as input. A conditional random search is selected as the inverse predictor and used to design two HEAs, which are experimentally verified to have the best combination of strength and ductility. The alloy design approach could help researchers design numerous new alloys with interesting properties.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Soung Yeoul Ahn, Dong Geun Kim, Jeong Ah Lee, Eun Seong Kim, Sang Guk Jeong, Rae Eon Kim, Jungho Choe, Soon-Jik Hong, Pham Quang, Sunghak Lee, Hyoung Seop Kim
Summary: This study investigates the mechanical properties of CoCrFeMnNi high-entropy alloy (HEA) manufactured through direct energy deposition. The effect of strain rate on the mechanical properties was analyzed, and a Johnson-Cook constitutive model was employed for simulation. The results showed that the microstructural behavior of the HEA was influenced by strain localization and twin formation, which have significant implications for the design and development of HEAs under extreme environments.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
K. R. Ramkumar, Hyojin Park, Jungwan Lee, Hyeonseok Kwon, R. J. Vikram, Eun Seong Kim, Alireza Zaragaran, Hyoung Seop Kim
Summary: This short communication presents the developed as-cast CoCrNi-based eutectic high entropy alloy, which achieved a balance between strength and ductility by adjusting the valence electron concentration. The alloy consists of a face-centered cubic (FCC) phase, an ordered B2 phase, and precipitates. The dislocation pile-up at the FCC/B2 interface provides a balance between strength and ductility over a wide temperature range.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Sang Guk Jeong, Soung Yeoul Ahn, Eun Seong Kim, Suk Hoon Kang, Sang Hun Yoo, Joo Young Ryu, Joo Hong Chun, Gangaraju Manogna Karthik, Hyoung Seop Kim
Summary: This study investigates the liquation cracking behavior of LPBF-processed Inconel718 and finds that heat treatments decrease its resistance to liquation cracking. Microstructural differences play a key role in determining the susceptibility to liquation cracking. The as-built material exhibits good resistance, providing more flexibility in high-temperature process design, while HIP treatment reduces internal defects but increases susceptibility to liquation cracking.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Farahnaz Haftlang, Alireza Zargaran, Jae Bok Seol, Jongun Moon, Peyman Asghari Rad, Eun Seong Kim, Hyoung Seop Kim
Summary: A novel maraging medium-entropy alloy was designed to achieve high tensile strength and uniform elongation at liquid nitrogen temperature by conducting a short-time martensite-to-austenite reversion treatment and adding needle-like (NiMn)(3-x)Ti-x and elliptical-shaped Ni2SiTi nano-precipitates. The alloy exhibited an ultra-high yield strength of 1.41 GPa and ultimate tensile strength of 1.88 GPa, with a uniform elongation of 14% in the reverted condition. These superior properties were attributed to the transformation-induced plasticity (TRIP)-assisted heterogeneous dual-phase microstructure strengthened by well-distributed nano-precipitates. The metastability-engineering approach can guide the design of TRIP-assisted maraging MEA to overcome the strength-ductility trade-off in extreme environments.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Yong Hee Jo, Hae-Rim Moon, Jae Wung Bae, Jisung Yoo, Seok Gyu Lee, Yun-Soo Lee, Hyoung-Wook Kim
Summary: Comparative analysis of traditional horizontal twin-roll casting (HTRC) and promising vertical twin-roll casting (VTRC) technologies was conducted to develop Al-Mg-Si strips with high mechanical performance. Two types of Al-Mg-Si alloys (H-alloy and V alloy) were fabricated and their microstructural evolution and mechanical properties were assessed. It was found that center segregation occurred in both alloys but in different forms, and the texture components and plastic deformation were different between the two alloys, leading to variations in their yield strength. Solid-solution strengthening and precipitation strengthening were found to improve the strength of V-alloy, while pre-existing voids caused premature fracture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Sang-Ho Oh, Yang-Jin Jeong, Sin-Hye Na, Jiman Kim, Byeong-Joo Lee
Summary: In this study, the fundamental reason for the formation of columnar Nb3Sn grains was investigated using a novel Monte Carlo Potts model. It was found that insufficient Sn at the interface leads to a decrease in thermodynamic driving force and the formation of columnar Nb3Sn grains. Possible ways to suppress columnar grain formation were suggested based on this understanding, and the difference in columnar grain fraction depending on the wire strand type was explored. A brief guideline for designing wire strand geometry to avoid columnar grain formation was proposed.
Article
Materials Science, Multidisciplinary
Jung Soo Lee, Guanglong Xu, Joung Sik Suh, Jun Ho Bae, Byeong-Chan Suh, Young Min Kim, Byeong-Joo Lee, Won-Seok Ko
Summary: Molecular dynamics simulations are used to study the deformation and twinning behavior of single-crystal Mg nanopillars under different loading orientations. The developed interatomic potential successfully reproduces the observed slip and twinning phenomena and provides insights into the nucleation and growth mechanisms of unconventional twins.
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
