Article
Nanoscience & Nanotechnology
He Wei, Yinli Chen, Yina Zhao, Wei Yu, Lan Su, Di Tang
Summary: The study investigated the relationship between microstructure and properties of a Copper-Nickel-Silicon-Cobalt alloy with different orientations. Results showed that the aged alloy exhibited clear anisotropy, showing different mechanical properties and conductivity between grains in the hard oriented zone and soft oriented zone.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Christian Wagner, Alberto Ferrari, Jurgen Schreuer, Jean-Philippe Couzinie, Yuji Ikeda, Fritz Koermann, Gunther Eggeler, Easo P. George, Guillaume Laplanche
Summary: The physical properties of ten single-phase FCC CrxMn20Fe20Co20Ni40-x high-entropy alloys were investigated. The lattice parameters of the alloys were nearly independent of composition, while the solidus temperatures increased linearly with increasing Cr content. The alloys did not exhibit ferromagnetism in a certain temperature range, and the temperature dependencies of their coefficients of thermal expansion and elastic moduli were independent of composition. Ab initio simulations qualitatively reproduced the magnetic transitions and magnetostriction observed in the alloys. The plastic deformation of the alloys was found to occur initially by the glide of perfect dislocations on {111} planes. The stacking fault energy (SFE) was determined and found to decrease with increasing Cr content. However, the calculated intrinsic SFEs were lower than the experimental values. The ab initio simulations showed that atomic relaxations, finite temperatures, and magnetism strongly influenced the intrinsic SFE.
Article
Engineering, Mechanical
Le Li, Zhenghao Chen, Koretaka Yuge, Kyosuke Kishida, Haruyuki Inui, Martin Heilmaier, Easo P. George
Summary: The plastic deformation behavior of equiatomic Cr-Fe-Co-Ni medium-entropy alloy was investigated through compression and tension experiments. The critical resolved shear stress (CRSS) for {111}<1((1)over bar)0> slip was found to be 44-45 MPa at room temperature without significant tension-compression asymmetry. The CRSS increased rapidly with decreasing temperature, but the temperature dependence dulled below 77 K due to the inertia effect. The 0 K CRSS was determined to be 200 MPa, higher than Cr-Mn-Fe-Co-Ni high-entropy alloy but lower than Cr-Co-Ni medium-entropy alloy.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Nanoscience & Nanotechnology
He Wei, Yinli Chen, Zulai Li, Quan Shan, Wei Yu, Di Tang
Summary: By conducting an in-depth exploration of the microstructure evolution and characterization of the dislocation density in Cu-Ni-Si-Co alloy, it was found that the alloy has good mechanical properties and electrical conductivity. The study also identified various structural features of the alloy, highlighting its potential for performance optimization and application.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Itsuki Yamaguchi, Mitsuharu Yonemura
Summary: This study investigates the deformation behavior of the high-temperature gamma-phase of low-carbon steel using quantitative observation of dislocation density and vacancies in the Ni-30 mass pct Fe alloy. The research aims to understand the work hardening, dynamic recovery (DRV), and dynamic recrystallization (DRX) behaviors in the gamma-phase of the Ni-30 mass pct Fe alloy during cold and hot compression through experiments and comprehensive analysis.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Dongsong Zeng, Jiongxian Li, Yinong Shi, Xiuyan Li, Ke Lu
Summary: By introducing a small amount of tungsten, the precipitation of intermetallic phases is suppressed, enhancing the thermal stability of the nanograined structure. The relaxation of grain boundary structures is achieved through the formation of annealing twins, facilitated by the reduction of stacking fault energy in the solid solution caused by tungsten addition.
Article
Physics, Multidisciplinary
Lin Lang, Huiqiu Deng, Jiayou Tao, Tengfei Yang, Yeping Lin, Wangyu Hu
Summary: This article investigates the formation and evolution of radiation-induced defects in NiCoFe MEA and pure Ni through molecular dynamics simulation and compares them. It is found that the defect recombination rate of ternary NiCoFe MEA is higher than that of pure Ni due to the decrease in energy dissipated through atom displacement caused by the increase in chemical disorder. Additionally, the stacking fault energy in Ni-Co-Fe decreases, facilitating the formation of ideal stacking fault tetrahedron structures.
Article
Materials Science, Multidisciplinary
Wenhao Pan, Huabei Peng, Yangyang Du, Jie Chen, Jiazhen Yan, Yuhua Wen
Summary: This study investigated the microstructures and shape memory effect (SME) of cast Fe-Mn-Si-CrNi alloys with four solidification modes. Ferritic-austenitic and ferritic modes introduced more stacking faults, reducing stress-induced critical martensite stress. Thus, the former solidification modes displayed better SME than the latter solidification modes.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Zhongsheng Yang, Feng He, Qingfeng Wu, Kaiwei Zhang, Dingcong Cui, Bojing Guo, Bin Han, Junjie Li, Jincheng Wang, Zhijun Wang
Summary: The study reveals that deformation twinning significantly affects the recrystallization behavior of HEAs, leading to distinct recrystallization kinetics in the two investigated alloys.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
S. Paul, B. Tripathy, R. Saha, P. P. Bhattacharjee
Summary: This study investigated the microstructure and crystallographic texture of an extremely low stacking fault energy high entropy alloy. Various changes and phase transformations were observed during heavy cold-rolling and annealing processes. The annealing texture showed remarkable resemblance with other low stacking fault energy alloys, and the suitably annealed alloy exhibited appreciable strength-ductility balance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Qin Zou, Xihui Ye, Yanguo Li, Wenqi Luo, Yongan Luo
Summary: Fe-Mn-Si-Cr-Ni shape memory alloys (SMAs) were prepared by mechanical alloying and discharge plasma sintering. The effects of milling time on the microstructure evolution, mechanical properties, superelasticity, and corrosion resistance of Fe-Mn-Si-Cr-Ni SMAs were investigated. The increase in milling time promoted the phase transition during the sintering process and affected the superelasticity and corrosion resistance of the alloy.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Xiaowen Peng, Kexing Song, Yanjun Zhou, Tao Huang, Haitao Liu, Yunxiao Hua, Jingzhao Yang, Guojie Wang
Summary: This study systematically investigates the influence of P content on the microstructure and texture evolution of oxygen-free copper during intermediate annealing and final cold rolling. It is found that the addition of P can refine grains and lead to the emergence of low angle grain boundaries (LAGBs), as well as transform the texture of the copper. Furthermore, the recrystallization temperature increases with the addition of P, and the grains are further refined during the final cold rolling process. The addition of P also affects the deformation and recrystallization texture of the copper.
Article
Nanoscience & Nanotechnology
Mengmeng Wang, Marko Knezevic, Ming Chen, Jiansheng Li, Tong Liu, Gang Wang, Yu Zhao, Miao Wang, Qi Liu, Zhongjia Huang, Dafan Du, Haiyan Gao, Jun Wang, Baode Sun
Summary: This paper presents an experimental investigation into tailoring the strength-electrical conductivity characteristics of an Al-Y eutectic alloy through cold drawing and annealing processes. The alloy exhibits high strength and extraordinary thermal stability due to grain refinement, formation of intermetallic phases, and the presence of stacking faults and fiber texture. The electrical conductivity of the alloy improves with annealing.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Dengshan Zhou, Zhenghao Chen, Kazuki Ehara, Kodai Nitsu, Katsushi Tanaka, Haruyuki Inui
Summary: Research shows that the macroscopic mechanical strength of single crystals of equiatomic Cr-Mn-Fe-Co-Ni high entropy alloy, which are expected to develop short-range ordering during thermal annealing, is not affected. The hardness, critical resolved shear stress, and activation volume values of the alloy do not significantly vary with the annealing temperature.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Kaori Kawano-Miyata
Summary: This study evaluated the susceptibility of polycrystalline Ni-Fe-Cr austenitic alloys to hydrogen-assisted fracturing and characterized the dislocation structures affected by hydrogen. It was found that hydrogen transforms the configuration of the dislocations, leading to increased brittleness in the alloy. The hydrogen trapping energy was found to be dependent on the chemical composition of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Kaushal Kishore, Avanish Kumar Chandan, Pham Tran Hung, Saurabh Kumar, Megumi Kawasaki, Jeno Gubicza
Summary: Microstructure and texture evolution of a Mn-added CoCrNi medium entropy alloy during high-pressure torsion (HPT) is investigated. The alloy exhibits a rapid rise in hardness at low shear strains, attributed to extensive dislocation activity, TWIP and TRIP effects, and microstructural refinement. At higher shear strains, hardness increases at reduced rates due to saturation of dislocation density and continued grain refinement. The FCC phase shows remarkable stability, with initial deformation-induced HCP martensitic transformation. The alloy demonstrates superior hardness compared to a wide spectrum of FCC materials, attributed to a combination of strengthening mechanisms.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Shobhit P. Singh, Ajay Rijal, Thomas Straub, Jae-Kyang Han, Tobias Kennerknecht, Christoph Eberl, Megumi Kawasaki, Praveen Kumar
Summary: Fatigue resistance can be improved in high-pressure torsion (HPT) materials, as crack nucleation is inhibited due to their high strength and crack propagation is arrested at the boundaries of their ultra-fine grains. The grain size remains stable during fatigue in HPT samples, leading to higher lifetimes compared to annealed samples.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Xinyu Ren, Xinglong An, Song Ni, Yi Huang, Min Song
Summary: This study investigates the microstructural and hardness evolutions of an Mg-5.91Gd-3.29Y-0.54Zr alloy during high-pressure torsion (HPT). The results show that deformation twinning plays a crucial role in the grain subdivision process, with finer multiple twins formed in the area subjected to large plastic strain. Moreover, the maximum hardness obtained from this method is much higher than that achieved from other traditional plastic deformation methods.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Shibayan Roy, Amit Sharma, Atanu Chaudhuri, Yi Huang, Terence G. Langdon, Satyam Suwas
Summary: This research investigated the microstructural evolution and mechanical response of Ti-6Al-4V alloy under high-pressure torsion (HPT) processing in different conditions. The addition of boron refined the grains and introduced an additional TiB phase, affecting the deformation response and microstructural evolution at low strains. The orientation of the colonies significantly influenced the deformation response and substructure formation. However, at higher strains, all alloys showed similar deformation response and microstructure evolution. The hardness variation and strength modeling suggested that microstructural refinement and increased dislocation density contributed to the hardness increment during HPT processing. The as-cast and beta-forged Ti-6Al-4V-0.1B alloys exhibited the same deformation response as the beta-forged unmodified Ti-6Al-4V alloy in the initial and intermediate stages.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Physics, Applied
Amitesh Paul, Xiaojing Liu, Megumi Kawasaki, Klaus-Dieter Liss
Summary: We observe unconventional magnetization behaviors in a high-pressure torsion processed CoCrFeNi high-entropy alloy. The magnetization protocol and DC susceptibility reveal the effects of spin-clustering, indicating a change in magnetic properties from superparamagnetic to superspin glass dynamics. The material shows an inverted magnetic hysteresis loop, with the remanent magnetization pointing in the opposite direction to the applied field. This spin-clustering phenomenon is attributed to a non-equilibrium population of oppositely polarized domains in an ordered ferromagnetic state enabled by the nanostructured, highly distorted, and locally disordered crystalline medium.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Leonardo M. M. Reis, Amanda P. P. Carvalho, Isshu Lee, Yun-Hsuan Wu, Jae-Kyung Han, Melissa K. K. Santala, Megumi Kawasaki, Roberto B. B. Figueiredo
Summary: The cold angular rolling process (CARP) is a continuous severe plastic deformation technique that can enhance the mechanical properties of bulk metal sheets. This study uses finite element method (FEM) to simulate CARP under different processing conditions, including friction values and processing velocities for various copper and stainless steel alloys. The simulations show the impact of these parameters on strain, strain rate, stress, temperature, and torque requirements during CARP. Experimental characterization of a copper sheet validates the modeling results. The FEM results are also utilized to estimate the energy incorporated into different metal alloys at different processing conditions, and the feasibility of scaling up the CARP technique is discussed.
JOURNAL OF MATERIALS SCIENCE
(2023)
Review
Chemistry, Physical
Mariana P. Medeiros, Debora R. Lopes, Megumi Kawasaki, Terence G. Langdon, Roberto B. Figueiredo
Summary: There is great interest in using severe plastic deformation (SPD) to improve the performance of magnesium for biological applications. However, contradictory reports exist regarding the properties and trends. This study reviews the structural features, mechanical properties, corrosion behavior, and biological response of magnesium and its alloys processed by SPD, with a focus on equal-channel angular pressing (ECAP) and high-pressure torsion (HPT). The results show that grain refinement through SPD can improve the mechanical properties and corrosion resistance of magnesium without compromising the biological response, indicating the great potential of SPD for enhancing the performance of magnesium for biological applications.
Article
Crystallography
Hiba Azzeddine, Abdelkader Hanna, Achour Dakhouche, Thierry Baudin, Francois Brisset, Yi Huang, Terence G. Langdon
Summary: The microstructure, texture evolution, and corrosion behavior were evaluated and compared for low light rare-earth containing Mg-1.4Nd and low heavy rare-earth containing Mg-0.6Gd and Mg-0.4Dy alloys after high-pressure torsion (HPT) processing and isochronal annealing. The results showed that the Mg-1.4Nd alloy exhibited a heterogeneous deformation microstructure while the Mg-0.6Gd and Mg-0.4Dy alloys had a homogeneous deformation microstructure. The HPT processing resulted in a deviated basal texture in all three alloys. The corrosion resistance of the HPT-processed Mg-RE alloys improved due to grain refinement, but decreased with increasing annealing temperature for the Mg-0.6Gd and Mg-0.4Dy alloys due to increased grain size.
Article
Materials Science, Multidisciplinary
Denise C. Machado, Paula Cibely Alves Flausino, Yi Huang, Paulo Roberto Cetlin, Terence G. Langdon, Pedro Henrique R. Pereira
Summary: Experiments were conducted to assess the effect of processing temperature on the hardness evolution, microstructure and the flow properties of an annealed Al-3Mg alloy processed by high-pressure torsion (HPT) at either 300 or 450 K. The results show that HPT processing at room temperature (RT) leads to higher microhardness values and a more uniform hardness distribution compared to processing at 450 K. The metal processed at RT exhibits enhanced strength and superplastic flow during deformation at 523 K, while the alloy processed at 450 K shows limited elongation due to abnormal grain coarsening.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Isshu Lee, Laxman Bhatta, Yun-Hsuan Wu, Lukas Daut, Roberto B. Figueiredo, Klaus-Dieter Liss, Brian K. Bay, Melissa K. Santala, Megumi Kawasaki
Summary: The cold angular rolling process (CARP) is a continuous severe plastic deformation technique for metal sheets. It can process sheets without any length limitations at room temperature and achieve desired microstructure and mechanical properties. In this study, copper sheets with different widths were processed using CARP to evaluate its capability. Lab-scale X-ray diffraction and tensile testing were conducted to analyze the evolution in dislocation density and mechanical properties of the CARP-treated sheets. The results confirm the potential of CARP as a useful sheet process for strengthening ductile metals.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Engineering, Mechanical
Kaushal Kishore, Avanish Kumar Chandan, Pham Tran Hung, Saurabh Kumar, Manish Ranjan, Megumi Kawasaki, Jeno Gubicza
Summary: This study revealed the significant impact of small silicon (Si) addition on the plasticity mechanisms, grain refinement, and hardening response of a non-equiatomic CoCrMnNi multi-principal element alloy (MPEA) during high-pressure torsion (HPT) processing. Si addition changed the plasticity mechanism from micro-band formation to extensive nano-twinning, increased the propensity for deformation twinning, and promoted higher dislocation density. Furthermore, Si addition accelerated nano-structuring and led to a finer saturation grain size.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Ouarda Ould Mohamed, Piotr Bazarnik, Yi Huang, Hiba Azzeddine, Thierry Baudin, Francois Brisset, Terence G. Langdon
Summary: The evolution of microstructure, texture, and mechanical properties of AZ31 and Mg-0.6Gd alloys after high-pressure torsion was investigated. The results showed differences in grain refinement behavior and microhardness evolution between the two alloys.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Nanoscience & Nanotechnology
Wenting Jiang, Xinglong An, Song Ni, Li Wang, Junyang He, Zibin Chen, Yi Huang, Min Song
Summary: By regulating the substructures, the classical Co25Cr5Mo5W alloy was successfully endowed with an excellent combination of strength and ductility. The study establishes a clear connection between the substructures and the mechanical properties, offering valuable implications for surpassing the current mechanical limitation in the Co-Cr-Mo alloy family.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Pedro Henrique R. Pereira, Piotr Bazarnik, Yi Huang, Malgorzata Lewandowska, Terence G. Langdon
Summary: Experiments were conducted to investigate the flow behavior and microstructural stability of Al-3Mg-0.2Sc alloy treated with high-pressure torsion at different temperatures. The results indicate that the yield strength and microstructural stability of the alloy are influenced by the processing temperature. Additionally, evidence of dynamic strain aging was observed during annealing.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Crystallography
Jintao Zhang, Shibo Wang, Hua Ding, Peng Hu, Yi Huang, Yu Zhang
Summary: In this study, high-pressure torsion (HPT) was used to process Ni49.6Ti35.4Hf15 alloy with 1/4, 2 and 16 turns under a pressure of 4.0 GPa. The results showed that a mixture of amorphous and nanocrystalline microstructure developed in the alloy with increased HPT turns. The hardness of the samples increased significantly after 16 turns of HPT. Annealing of the HPT-processed samples at 550°C resulted in the formation of very fine martensite, with finer microstructures obtained with higher HPT turns. Differential scanning calorimetry (DSC) tests confirmed the transformation behavior after severe plastic deformation and annealing, providing experimental basis for the application of shape memory alloy.
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)