Article
Chemistry, Physical
Sergey Mironov, Maxim Ozerov, Alexander Kalinenko, Ivan Zuiko, Nikita Stepanov, Oleg Plekhov, Gennady Salishchev, Lee Semiatin, Sergey Zherebtsov
Summary: Laser shock peening (LSP) is an innovative technique used to enhance fatigue strength in structural materials by generating significant residual stress. This study aimed to evaluate the plastic strain induced during LSP and improve the understanding of the process. Electron backscatter diffraction (EBSD) and nano-hardness measurements were conducted on laser-shock-peened Ti-6Al-4V alloy to examine the microstructural response. Minor changes were observed in the shape of α grains/particles and hardness, indicating a small plastic strain. This unexpected result was attributed to a relatively high rate of strain hardening in Ti-6Al-4V during LSP.
Article
Nanoscience & Nanotechnology
C. Andrews, T. W. Heo, R. Shi, C. Basgul, S. Kurtz, M. J. Matthews, M. L. Taheri
Summary: This research aims to quantify the microscale origins of strain in L-PBF manufactured Ti-6Al-4V, understand the interplay between phase evolution and strain, and examine post-processing strain relief strategies. The study found that macroscale thermal strains decreased with heat treatment time, but lattice distortive strain remained primarily in the alpha grains. The retention of the beta phase significantly changed the strain and dislocation distribution while reducing overall residual strain.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Jianfeng Zhao, Xinlei Pan, Jian Li, Zhiyong Huang, Qianhua Kan, Guozheng Kang, Liucheng Zhou, Xu Zhang
Summary: Systematic characterization of microstructure, mechanical testing and constitutive modeling were conducted to investigate the effects of laser shock peening (LSP) treatment on the tensile properties of Ti-6Al-4 V alloy. The study revealed that LSP treatment resulted in grain refinement and introduction of compressive residual stress, leading to changes in the material's elastic-plastic behavior. The established deformation mechanism-based model showed that surface grain refinement enhanced initial yielding and strain hardening, while residual stress had a weakening effect on initial yielding but little influence on strain hardening behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
K. Praveenkumar, Phani Mylavarapu, Aritra Sarkar, E. Isaac Samuel, A. Nagesha, S. Swaroop
Summary: The influence of laser shock peening without coating (LPwC) on the induced compressive residual stress and the fatigue behavior of curved samples of Ti-6Al-4V was investigated. The study found that laser shock peening can increase fatigue life and retard crack propagation rate. The effect of grain refinement and misorientation angles on fatigue behavior was also considered.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Materials Science, Multidisciplinary
K. M. Bertsch, T. Voisin, J. B. Forien, E. Tiferet, Y. Ganor, M. Chonin, Y. M. Wang, M. J. Matthews
Summary: Effective optimization of Ti-6Al-4 V production using AM requires understanding the importance of different microstructural features to deformation and failure mechanisms. This study compared the tensile response and deformation mechanisms of EBM and SLM AM Ti-6Al-4 V materials and evaluated the influence of phase distribution, defect density, and porosity on material strength and ductility. The results suggest that phase distribution and defect density are crucial for determining material strength and maximum strain to failure, while porosity limits part ductility.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
K. Praveenkumar, Phani Mylavarapu, S. Swaroop
Summary: In this study, laser peening without coating was conducted on Ti-6Al-4V, resulting in unique residual stress and oxide layer formation. Acid pickling was used to remove the oxide layer, and the peening also caused changes in the grain boundaries, further enhancing the strength of the alloy.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Nanoscience & Nanotechnology
Zhongwei Xu, An Liu, Xishu Wang
Summary: In this study, a series of fatigue tests were conducted on rolled Ti-6Al-4V alloys to investigate the influence of macrozones on fatigue cracking behavior and fracture mechanisms. It was found that different macrozones have varying effects on fatigue crack propagation and resistance.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Alec I. Saville, Amy J. Clarke
Summary: This study introduces a reconstruction process to evaluate the microstructural evolution of the high temperature fl-Ti phase in a Ti-Cu binary alloy. While the reconstruction of martensitic microstructures was successful, the reconstruction of pearlitic microstructures was not effective. However, this analysis provided new insights into the interfacial crystallographic orientations of pearlitic Ti-Cu microstructures.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Edwin J. Schwalbach, Jake T. Benzing, Vikas Sinha, Todd M. Butler, Adam L. Pilchak, Kevin J. Chaput, Norman D. Schehl, Reji John, Nikolas Hrabe
Summary: Electron beam powder bed fusion scan strategies can lead to variations in crystallographic texture and mechanical properties for Ti-6Al-4V, even below the recommended maximum scan line length. The microstructural attributes are similar for short and long scan line length conditions, but the crystallographic textures vary considerably.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Automation & Control Systems
Kunhao Xu, Jingchen Wang, Yukui Gao, Fan Yang, Yongdong Pan
Summary: One factor that significantly affects the aerodynamic performance of aeroengines is the blade shape, which can be altered by plastic deformation and residual stresses induced during the manufacturing processes, particularly shot peening. However, there have been few studies focusing on the strategies of shot peening on complex blade profiles and the cumulative effects of residual stresses throughout the manufacturing processes. In this study, using the concept of eigenstrains, the impact of shot peening on residual stresses and deformation of blades was investigated through a combination of experimental measurement and local-global simulation. The results indicate that the initial residual stresses induced by milling can be disregarded. Shot peening resulted in the highest deformation of the blade when considering the initial residual stresses during milling with substantial material removal compared to cases without considering initial residual stresses or considering them after dynamic milling. Additionally, the in-out sequence of shot peening led to the smallest deformation, and pre-deformation of the blade effectively compensated for this deformation. Furthermore, it is recommended to avoid excessively high shot peening intensity in practical blade manufacturing, especially for small thickness, to maintain reliability and safety.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
A. Manjunath, V. Anandakrishnan, S. Ramachandra, K. Parthiban, S. Sathish
Summary: Wire additive manufacturing is an effective and efficient technique for producing complex and bulky components in the aerospace industry. This study focuses on the heterogeneous and anisotropic behavior of Ti-6Al-4 V alloy fabricated through electron beam wire additive manufacturing. The results show that samples built along the Z-axis exhibit higher yield strength and percentage elongation compared to samples built in other orientations.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Coatings & Films
K. Praveenkumar, S. Swaroop, Geetha Manivasagam
Summary: The present study investigates the effects of laser peening without coating on the fatigue and fretting wear behavior of AISI 304 alloy. Laser peening treatment increases the compressive residual stress, microhardness, and refines the grain size of the alloy, resulting in improved fatigue and fretting wear resistance.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
A. E. Davis, J. Donoghue, J. R. Kennedy, N. Byres, P. B. Prangnell
Summary: In-situ cooling experiments were conducted on Ti64 samples for the first time, revealing the development of alpha colonies. Primary alpha laths play a crucial role in influencing subsequent colony growth and transformation process by nucleating secondary alpha laths through sympathetic autocatalysis.
Article
Materials Science, Multidisciplinary
Andrew Deal, Ian Spinelli, Andrew Chuang, Yan Gao, Thomas Broderick
Summary: The study successfully determined elastic strain and residual stress values in an engineering material using high-resolution EBSD and reference patterns from annealed, recrystallized material. The methodology showed good repeatability and provided insight into the state of individual grains.
MATERIALS CHARACTERIZATION
(2021)
Article
Nanoscience & Nanotechnology
Tingyan Yan, Jinzhao Liu, Ke Hu, Xufeng Kang, Xiaohong Zhan
Summary: This study investigated the microstructure and microtexture evolution of Ti-6Al-4V T-joints produced by DLBSW using OM and EBSD, and correlated the results with mechanical properties. Significant differences were found in temperature field, grain morphology, misorientation angles, and texture intensity among different zones of the joint. The WS had a lower geometrically necessary dislocations density and a higher peak misorientation angle, leading to the generation of twins. The HAZ showed more heterogeneous properties compared to the weld due to a higher microstructure gradient.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
N. Yurchenko, E. Panina, A. Tojibaev, V. Novikov, G. Salishchev, S. Zherebtsov, N. Stepanov
Summary: This study demonstrated the diverse effects of B2 ordering on the tensile mechanical properties of new refractory medium-entropy alloys, AlxNb40Ti40V20-x (x = 0; 15; 20 at%). The impact of the ordering depended on the chemical composition. Al15Nb40Ti40V5 alloy, with weak B2 ordering, exhibited large uniform room-temperature elongation and moderate high-temperature strength. On the other hand, Al20Nb40Ti40 alloy, with high B2 ordering, was brittle at room temperature and sensitive to the testing environment at elevated temperatures. Meanwhile, it showed slower softening up to 0.4 Tm but lost strength faster above 0.4 Tm compared to the bcc Nb40Ti40V20 or weakly B2-ordered Al15Nb40Ti40V5 alloys. The factors responsible for these mechanical properties were thoroughly discussed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Ruslan Kuliiev, Stefan Riekehr, Volker Ventzke, Soeren Keller, Nikolai Kashaev
Summary: This paper investigates the effect of testing frequency on the fatigue behavior of metallic materials. The results show that changes in testing frequency significantly influence the mechanical response of Ti-6Al-4V alloy, while no substantial impact on the fatigue properties of AA2024 and Inconel 718 alloys was identified. These findings contribute to a more complete understanding of the frequency sensitivity of alloys and provide insights for the design and evaluation of materials used in high-frequency applications.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Nanoscience & Nanotechnology
N. Yurchenko, E. Panina, A. Tojibaev, V. Novikov, G. Salishchev, S. Zherebtsov, N. Stepanov
Summary: Here, it is demonstrated that the grain size, rather than the domain size, plays a crucial role in determining the room-temperature properties of a B2-ordered refractory Al15Nb40Ti40V5 medium-entropy alloy. Refining the grain size to 20 μm, regardless of the domain size, resulted in an elongation of approximately 50%, surpassing all previously reported refractory high/medium-entropy alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Kirill Vasilevich Kuskov, Andrey A. A. Nepapushev, Sofiya Aydinyan, Dmitry G. G. Shaysultanov, Nikita D. D. Stepanov, Khachik Nazaretyan, Suren Kharatyan, Elena V. V. Zakharova, Dmitry S. S. Belov, Dmitry O. O. Moskovskikh
Summary: This research reports the direct production of a high-entropy intermetallic CoNi0.3Fe0.3Cr0.15Al material with a B2 structure from mechanically activated elemental powder mixtures. Various synthesis methods were used to obtain the desired powders and bulks. The formation of the main B2 phase and other secondary phases were observed, and the interaction between the components during heating was studied. The alloy synthesized by the reactive SPS method showed enhanced mechanical properties at elevated temperatures.
Article
Chemistry, Physical
Dmitrii Panov, Egor Kudryavtsev, Stanislav Naumov, Denis Klimenko, Ruslan Chernichenko, Vladimir Mirontsov, Nikita Stepanov, Sergey Zherebtsov, Gennady Salishchev, Alexey Pertcev
Summary: The study investigates the changes in microstructure and texture gradient of a 321-type metastable austenitic stainless steel during cold rotary swaging. Through cold rotary swaging with a 90% reduction at ambient temperature, significant gradients are observed in the volume fraction of alpha'-martensite, axial texture of austenite and alpha'-martensite, and non-uniform microhardness distribution along the rod diameter after an 80-90% reduction. Finite element analysis reveals moderate tensile stresses at the center and high compressive stresses at the edge, along with a temperature gradient due to water cooling and heating during the process. The paper discusses strain-induced martensitic transformation, microstructure and texture evolution, and non-uniform hardening during cold rotary swaging.
Article
Materials Science, Multidisciplinary
Maxim Ozerov, Nikita Yurchenko, Vitaly Sokolovsky, Elena Nozdracheva, Evgeniya Panina, Sergey Nadezhdin, Nikita Stepanov, Sergey Zherebtsov
Summary: Ti(50-x)Zr38NbxTa8Sn4 high-entropy alloys with x = 0, 10, and 20 at.% were produced. The Ti30Nb20 and Ti40Nb10 alloys showed untypical mechanical behavior with a short strain-hardening stage followed by a gradual decrease in flow stress after reaching the yield point. The Ti30Nb20 and Ti40Nb10 alloys have properties that make them highly attractive for biomedical application.
Article
Engineering, Manufacturing
Mengjie Wang, Nikolai Kashaev
Summary: The present study investigates the processability and optimal process window of high-strength Al-alloy AA7050 in powder-based laser-directed energy deposition (L-DED). The results show that the scanning strategy and robot program have a strong effect on buildability, geometrical accuracy, melt pool visibility, porosity level, and crack initiation. By choosing an appropriate combination of scanning strategy and robot program, hot cracks can be reduced or eliminated, and the geometrical accuracy can be well maintained for specimens with any height. Appropriate L-DED process parameters were identified for the deposition of structures up to 24 layers with a lower porosity level (about 3.7 +/- 0.8 %) and lower amount of hot cracks, comparable with that in the 12-layer structure.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Theano N. Examilioti, Wenya Li, Nikolai Kashaev, Volker Ventzke, Benjamin Klusemann, Murat Tiryakioglu, Nikolaos D. Alexopoulos
Summary: In this study, the anisotropic mechanical behavior of Al-Cu-Li (AA2198) alloy was investigated under different artificial ageing conditions and for different thicknesses of the material. The results showed that the grain structure did not change significantly when applying different ageing times. The major precipitates observed were T1 (Al2CuLi) phases, which increased in size with artificial ageing time. The specimens extracted in the diagonal direction showed high variation in mechanical properties compared to the other two directions investigated.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
E. Povolyaeva, D. Shaysultanov, I. Astakhov, M. Klimova, S. Zherebtsov, N. Stepanov
Summary: This study investigated two medium-entropy alloys, Fe60 and Fe65, which underwent cold rolling and subsequent annealing. Fe60 alloy had a fcc structure, while Fe65 alloy contained a significant amount of bcc martensite. Fe65 alloy exhibited a stronger TRIP effect, leading to a more comprehensive combination of properties. Quantitative analysis of the structure-properties relationships revealed similarities and differences between the two alloys' behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Ilya Magidov, Konstanitin Mikhaylovskiy, Svetlana Shalnova, Ilya Topalov, Marina Gushchina, Sergey Zherebtsov, Olga Klimova-Korsmik
Summary: An important direction in the development of additive technologies is the addition of ceramic particles to metal powders. This study predicted the physical and mechanical characteristics of a SiC-particle-reinforced composite material and found that the addition of SiC particles improved the properties in the whole temperature range.
Article
Chemistry, Physical
Sergey Mironov, Maxim Ozerov, Alexander Kalinenko, Ivan Zuiko, Nikita Stepanov, Oleg Plekhov, Gennady Salishchev, Lee Semiatin, Sergey Zherebtsov
Summary: Laser shock peening (LSP) is an innovative technique used to enhance fatigue strength in structural materials by generating significant residual stress. This study aimed to evaluate the plastic strain induced during LSP and improve the understanding of the process. Electron backscatter diffraction (EBSD) and nano-hardness measurements were conducted on laser-shock-peened Ti-6Al-4V alloy to examine the microstructural response. Minor changes were observed in the shape of α grains/particles and hardness, indicating a small plastic strain. This unexpected result was attributed to a relatively high rate of strain hardening in Ti-6Al-4V during LSP.
Article
Materials Science, Multidisciplinary
Maxim Ozerov, Nikita Stepanov, Vitaly Sokolovsky, Ilya Astakhov, Margarita Klimova, Alexander Galtsev, Lujun Huang, Sergey Zherebtsov
Summary: A metal-matrix composite with TiB reinforcing fibers was produced using vacuum arc melting, resulting in a 40% increase in strength compared to the unreinforced alloy. The composite exhibited a yield strength of 1100 MPa and a ductility of 10% in compression at room temperature. At elevated temperatures, the composite maintained a yield strength 1.5-2 times greater than the unreinforced alloy. The interphase boundary between TiB particles and the matrix was defect-free. Processing maps were analyzed for both the composite and the unreinforced 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)
