Article
Nanoscience & Nanotechnology
Yihong Wu, Boxiao Liu, Huijun Kang, Enyu Guo, Jiehua Li, Guohao Du, Zongning Chen, Tongmin Wang
Summary: This study uses SR-CT to reveal the effect of ultrasound vibration treatment on particle dispersion. The results show that ultrasound vibration treatment can completely eliminate mesoscale agglomerates in aluminum alloys. The composites not only have significant strengthening effect but also improved ductility after ultrasound treatment.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xintian Liu, Yaqing Sun, Yongbiao Wang, Sensen Jia, Yujuan Wu, Liming Peng, Jianglei Fan, Ying Li, Jianxiu Liu, Ansheng Li
Summary: The solidification process of Mg-15Gd alloys with different cross-section geometry was investigated using synchrotron radiation imaging technology. The evolution of dendrites, including nucleation and growth processes, was recorded and analyzed. The results show that the cross-section geometry of the samples has a significant effect on the number and growth rate of dendrites, as well as solute distribution.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Zhiguo Zhang, Chuangnan Wang, Billy Koe, Christian M. Schleputz, Sarah Irvine, Jiawei Mi
Summary: High speed synchrotron X-ray imaging and ultrafast tomography were used to study the fragmentation and growth dynamics of dendritic microstructures in an Al-15%Cu alloy under ultrasound. The results showed that efficient dendrite fragmentation occurred due to the acoustic flow, with thermal perturbation remelting plus mechanical fracture and separation being the dominant mechanism, while acoustic flow fatigue impact and phase collision effects played a minor role. Ultrasound application in the early solidification stage for just 10 s led to a significant increase in dendrite fragment number.
Article
Chemistry, Physical
Qingsong Liu, Ge Zhu, Ruhong Li, Shuaifeng Lou, Hua Huo, Yulin Ma, Jiale An, Chuntian Cao, Fanpeng Kong, Zaixing Jiang, Mi Lu, Yujin Tong, Lijie Ci, Geping Yin, Jiajun Wang
Summary: The research team successfully achieved the goal of uniform plating in lithium metal batteries by constructing 3D ionic-electronic transport channels, improving the stability and rate capability of the batteries.
ENERGY STORAGE MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
Sheng Li, Biao Cai, Ranxi Duan, Lei Tang, Zihan Song, Dominic White, Oxana Magdysyuk, Moataz M. Attallah
Summary: This study successfully fabricated a high-strength TiB2/Al-Cu composite with random texture using LPBF. Characterization techniques revealed ultra-fine grains with an average size of about 0.86 μm, and a yield strength and total elongation of 317 MPa and 10%, respectively. In situ synchrotron techniques were used to investigate defects and lattice strain evolution during tensile loading, contributing to the development of crystal-plasticity models.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Chemistry, Physical
Gennady N. Elmanov, Ilya Kozlov, Saule M. Irmagambetova, Kirill E. Prikhodko, Roman D. Svetogorov, Petr A. Chernavskii, Anton A. Lukyanchuk, Anton M. Shutov, Oleg A. Raznitsyn, Vadim P. Tarasov, Sergey A. Gudoshnikov
Summary: The study focused on the nucleation and growth processes of crystalline phases in Co-based amorphous micro wires in a glass shell, utilizing various theoretical models to process kinetic curves. X-ray diffraction and High Resolution Transmission Electron Microscopy were used to analyze the microstructure evolution. Novel methods, including sample magnetization changes over time and temperature, were employed to study the crystallization process kinetics. Analysis of kinetic curves revealed the Avrami exponent values, dimensionality of crystal growth, and absence of nucleation in the crystal growth process. The activation energy of primary crystallization process was determined by three methods, correlating with the nanocrystallization of the alloy due to the presence of chromium.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Metallurgy & Metallurgical Engineering
Ling Qin, Zhiguo Zhang, Baisong Guo, Wei Li, Jiawei Mi
Summary: In this study, in situ synchrotron X-ray radiographic and tomographic imaging techniques were combined to evaluate the critical fracture stress of growing dendrites during the solidification of an Al-15 wt% Cu alloy. Two dendritic 3D models were proposed to simulate the morphologic characteristics and revealed that the critical fracture stresses of the Al dendrites were in the range of 0.5 kPa-0.05 MPa. These results demonstrate the feasibility of measuring the high-temperature mechanical properties of metallic dendrites.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Kailin Luo, Ziyu Leng, Zhendong Li, Jiahe Chen, Nannan Sun, Jinting Xu, Xiaoling Cao, Zhe Peng
Summary: This research provides a new hierarchical lithiophilic structure to suppress severe lithium dendrite growth and promote the development of high-energy-density lithium metal batteries for practical applications.
Article
Chemistry, Physical
D. A. Angel, T. Miko, F. Kristaly, M. Benke, Z. Gacsi, G. Kaptay
Summary: The study investigated the kinetics of transformation of 5 w% TiB2 nano-particles dispersed in a Ti matrix, finding that a complex Avrami kinetics described the transformation better than the classical one-step Avrami kinetics due to the formation of oxide inhibitors from contaminants.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Fei Chen, Jinrong Zhang, Yuchen Sun, Xizhou Kai, Yutao Zhao
Summary: Synchrotron radiation was used to investigate the formation mechanisms of TiB2 particles in an aluminium melt. It was found that TiAl3 particles dissolve and release free Ti atoms, which react directly with solid-state AlB2 particles, serving as an important source for the formation of both dispersed TiB2 nanoparticles and TiB2 aggregations in the high temperature aluminium melt. A model was proposed to explain the formation of TiB2 nanoparticles, consisting of five steps, with the cracking of bulk AlB2 particles being an important factor controlling the formation of TiB2 particles.
TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS
(2023)
Article
Nanoscience & Nanotechnology
Michael Musi, Benjamin Galy, Jean-Philippe Monchoux, Alain Couret, Helmut Clemens, Svea Mayer
Summary: Electromagnetic-assisted sintering offers time-efficient densification for intermetallic gamma-TiAl based powders, with controlled microstructure and mechanical properties through imposed temperature profiles. This study presents insights into phase evolution during the process using high-energy X-ray diffraction, highlighting the transferability of data to spark plasma sintering technology. The experiment provides time-resolved observations of non-equilibrium and equilibrium phase transformations, showcasing the potential for electromagnetic-assisted sintering in powder consolidation processes.
SCRIPTA MATERIALIA
(2022)
Article
Optics
Han Chu, Jiang Ping, Geng Shaoning, Liu Kun
Summary: The nucleation mechanism in oscillating laser welds of 2024 aluminium alloy was investigated using numerical and experimental methods in this study. Numerical results showed that the flow direction of the molten metal aligned with the laser beam movement, causing periodic fluctuations of the flow field in the molten pool. Experimental results indicated periodic temperature fluctuations at different positions in the molten pool, leading to reheating of the molten metal. The nucleation mechanism was identified as dendrite fragmentation, resulting in grain refinement in the welds.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
H. Oike, K. Takeda, M. Kamitani, Y. Tokura, F. Kagawa
Summary: Complex behaviors were observed in the phase evolution of transition-metal dichalcogenide IrTe2 thin flakes using scanning Raman microscopy, indicating that the degree of phase evolution can vary significantly in small-sized specimens. The emergence of a superconducting phase without chemical doping in a small-volume specimen highlights the significant impact of phase complexity on physical properties.
PHYSICAL REVIEW LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Xiao-Ru Chen, Bo-Chen Zhao, Chong Yan, Qiang Zhang
Summary: Lithium metal as a promising alternative anode material for high-energy-density batteries is crucial in the new era of advanced energy storage. Understanding the deposition mechanism from nucleation to early growth is essential for improving battery performance and dendrite-free deposition behavior. Various models have been proposed to enhance the insight into the lithium deposition process, opening up new possibilities for practical lithium metal batteries.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
L. Abou-Khalil, Z. Thompson, G. Reinhart, T. Stan, L. Sturz, G. Zimmermann, P. W. Voorhees, N. Mangelinck-Noel, H. Nguyen-Thi
Summary: Three-dimensional reconstruction of the microstructure of Al - 7 wt.% Si samples solidified in microgravity conditions on the International Space Station revealed that the number of dendrite fragments depends on the dendrite network configuration. Samples with multiple dendrites with different orientations had more fragments compared to samples with well-aligned dendrites. The highest number of fragments was found in the region corresponding to an incipient grain boundary where dendrites with different orientations compete, indicating that dendrite misorientation during solidification leads to the formation of dendrite fragmentation.
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)