Article
Materials Science, Ceramics
Lei Su, Min Niu, Mingzhu Li, De Lu, Pengfei Guo, Lei Zhuang, Kang Peng, Hongjie Wang
Summary: Ceramic aerogels have attractive properties for applications in various fields due to their high porosity, low density, high specific surface area, low thermal conductivity, and thermal stability. However, the brittleness of conventional ceramic aerogels hinders their practical use. Resilient ceramic aerogels have overcome the brittleness issue but still exhibit brittleness under tensile stress and limited load-bearing ability. In this short review paper, strategies for modifying the mechanical properties of resilient ceramic aerogels are discussed, including the deformation and moving ability of nanowire building blocks and the deformation resistance provided by the aerogel architecture. Perspectives for further modification are also explored.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Shuo Gao, Xiangke Lv, Xiaoqian Bao, Rongxia Wang, Shanshun Zha, Jiheng Li, Xuexu Gao
Summary: Commercial Nd-Fe-B sintered magnets were processed with Pr-Cu, Pr-Al, and Pr-Tb-Cu alloys through grain boundary diffusion, resulting in increased coercivity but reduced bending strength. Microstructure analysis showed that Cu enriched at grain boundaries, while Tb and Al atoms diffused into the main phase and caused lattice distortion, leading to decreased bending strength.
Article
Chemistry, Physical
Bingyang Ma, Xiaoben Qi, Rongbin Li, Rulin Zhang, Hailong Shang
Summary: In this study, Al-Zr nanocrystalline alloy films were prepared by magnetron sputtering with Zr contents ranging from 0 to 8.3 at.%. The films exhibited a supersaturated solid solution structure of Zr in the Al lattice, with added Zr atoms segregating at grain boundaries. The film's hardness increased gradually with Zr content, mainly due to grain refinement, solid solution, and nanocrystalline solution pinning strengthening mechanisms. Among these mechanisms, grain refinement was the most significant contributor, followed by solid solution strengthening and nanocrystalline solution pinning strengthening.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Serhat Sap, Aydin Turgut, Mahir Uzun
Summary: Through microstructure studies, a homogeneous interface between reinforcement elements and main matrix was determined in the Cu/Ti-B-SiCp hybrid composite materials; the samples with 6 wt% reinforcement ratio showed the highest hardness value, while samples with 4 wt% reinforcement ratio exhibited the maximum strength values in hardness and strength tests.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Youngkyu Hwang, Anupam Sadhu, Sangho Shin, Shin Woei Leow, Ze Zhao, Jingyu Deng, Joshua A. Jackman, Munho Kim, Lydia H. Wong, Nam-Joon Cho
Summary: This study reports the fabrication of a flexible substrate made from pollen, which exhibits high transparency (>92%) and high haze (>84%), with optical properties that are tunable and arise from light-matter interactions with the spiky surface of pollen particles. The pollen substrate, readily obtained from nature and requiring minimal extraction or processing, can be incorporated into optoelectronic applications such as functional perovskite solar cells.
ADVANCED MATERIALS
(2021)
Article
Crystallography
Guangjie Feng, Bingxu Hu, Xiaojian Liu, Yan Wei, Zhuoran Li, Peng He, Zhiliang Cheng, Yifeng Wang, Dean Deng, Xiuxia Yang
Summary: In this study, SiCp/Al composites were bonded using the laser-induced exothermic bonding method. The addition of Zr content enhanced the interfacial reactions between the bonding interlayer and the SiCp/Al composites. The interlayer products transformed from NiAl to the eutectic organization of NiAl + Ni-Al-Zr, thus decreasing the pores in the joint and improving the bonding quality.
Article
Materials Science, Multidisciplinary
Yu-Cai Wu, Xi -Chun Zhong, Yuan-Xin Li, Xuan Huang, Jiao-Hong Huang, Cui-Lan Liu, Zhong-Wu Liu, Wan-Qi Qiu, Ming -Long Zhong, Zhen-Chen Zhong, R. V. Ramanujan
Summary: LaFe11.8Si1.2/16wt%La65Co35 samples were prepared by spark plasma sintering (SPS) and subsequent annealing. The La65Co35 binder increased the 1:13 phase content, and the alpha-Fe phase formed and disappeared during annealing. The sample annealed for 0.5 h showed a distinct core-shell structure, desirable table-like (-Delta S-M) -T curve, and higher RC value. The diffusion of Co was hindered by the growth of La5Si3 phase. Samples annealed for 24 h achieved larger (-Delta S-M)(max) and (sigma(bc))(max) values. The method combining SPS and diffusion annealing is promising for preparing La-Fe-Si based magnetocaloric composites with good properties.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Materials Science, Multidisciplinary
Chunhua Chen, Dongmei Li, Rongna Ren, Xia Zhou, Qixin Chen, Xiaolong Guo, Peng Yu
Summary: By mixing Al2O3 particles into the Cu47Zr47Al6 amorphous alloy matrix, a Cu47Zr47Al6/Al2O3 metallic glass composite is fabricated and shows improved plasticity and work hardening. The amorphous structure is retained with no intermetallic compounds produced, leading to enhanced overall performance of the composite material.
Article
Materials Science, Multidisciplinary
Andres Felipe Ordonez Jimenez, Henry Samir Vanegas, Carlos Mauricio Moreno, Jhon Jairo Olaya, Yaneth Pineda
Summary: CrAlTiN-Si coatings have the ability to prolong the operational life and improve the performance of cutting tools due to their exceptional mechanical, thermal, and tribological properties. The incorporation of silicon significantly influenced the chemical composition, microstructure, and mechanical properties of the coatings.
Article
Construction & Building Technology
Sawekchai Tangaramvong, Peem Nuaklong, May Thazin Khine, Pitcha Jongvivatsakul
Summary: The use of granite industry waste as a mixing material in concrete can reduce natural aggregate consumption and solid waste disposal problems. This study found that incorporating recycled granite aggregate did not significantly affect the compressive strength of concrete, but did lower the tensile strength, especially in low-strength concrete. The presence of granite particles also decreased the workability of fresh concrete, as seen in the microstructure images showing weakened interfacial transition zones.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Engineering, Chemical
Guilherme Jorge Brigolini Silva, Vanessa Pereira Santana, Marta Wojcik
Summary: This study explored the potential of biomass fly ash as a precursor material for the synthesis of alkali activated materials. The results showed that increasing NaOH concentration and decreasing glass powder content can improve the mechanical properties of the materials, which exhibited high porosity and some microcracks.
Article
Materials Science, Multidisciplinary
Han Zhang, Tingting Zhang, Liwei Lan, TianMing Sun, Shubang Wang, Feng Liu, Zhihang Yan, Mi Yang, Wenxian Wang
Summary: The effect of quenching treatment on the structure and tensile properties of FeCrAl rolled-state alloy was studied to optimize its strength-ductility trade-off. Quenching at 960°C for 400 seconds transformed the inhomogeneous weave gradient into uniform equiaxed grains and increased the elongation rate from 16% to 24%. Ductile dimples appeared in the tensile fracture, indicating a 50% improvement in ductility. This study highlights the potential of FeCrAl alloys for improved mechanical properties through heat treatment.
Article
Chemistry, Physical
Maxim Shtern, Alexey Sherchenkov, Yury Shtern, Nikolay Borgardt, Maxim Rogachev, Alexey Yakubov, Alexey Babich, Dmitry Pepelyaev, Irina Voloshchuk, Yuliya Zaytseva, Svetlana Pereverzeva, Alexander Gerasimenko, Dmitry Potapov, Denis Murashko
Summary: Bulk nanostructured n-type PbTe and p-type Ge0.96Bi0.04Te were prepared by grinding and spark plasma sintering, and their mechanical properties were investigated. The nanostructured materials showed higher mechanical properties compared to the synthesized materials, and grinding time had a small effect on their properties. The efficiency of the nanostructured materials was 10-14% higher than that of the materials obtained by hot pressing. The thermal stability of the materials was influenced by temperature and time, and protective coatings were necessary for long-term use.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Materials Science, Multidisciplinary
Xiaohui Yin, Qunshuang Ma, Bing Cui, Lei Zhang, Xingyan Xue, Sujuan Zhong, Dong Xu
Summary: Cemented carbides are often combined with ductile steels using brazing as an effective method to achieve high quality joints. Researchers have focused on utilizing Cu-based and Ag-based brazing filler metals to analyze their effects on the cemented carbide joints. Newly developed brazing filler materials such as nickel-based high temperature brazing filler metal and amorphous brazing filler metal have shown potential in fabricating high quality joints.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Linda Abbassi, David Mesguich, Loic Coulomb, Geoffroy Chevallier, Romain Aries, Claude Estournes, Emmanuel Flahaut, Romain Viennois, Mickael Beaudhuin
Summary: In this paper, a simple route to synthesize nano-beta-FeSi2 material is reported. The impact of spark plasma sintering parameters on the material properties is studied. Experimental results show that high-density nano-beta-FeSi2 pellets can be obtained using this method in a short time.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Kazuho Okada, Akinobu Shibata, Taisuke Sasaki, Hisashi Matsumiya, Kazuhiro Hono, Nobuhiro Tsuji
Summary: This study aimed to improve the resistance against hydrogen embrittlement by increasing the concentration of carbon segregated at prior austenite grain boundary (PAGB), XPAGB, in low-carbon martensitic steels. The specimens with and without carbon segregation treatment (Non-seg and Seg specimens, respectively) had similar microstructures, except for higher XPAGB in the Seg specimen. The Seg specimen exhibited higher maximum stress and smaller fraction of intergranular fracture surface under hydrogen-charged conditions, indicating that segregated carbon suppressed hydrogen accumulation and increased cohesive energy of PAGB.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Baoqi Guo, Wenqi Mao, Yan Chong, Akinobu Shibata, Stefanus Harjo, Wu Gong, Huicong Chen, John J. Jonas, Nobuhiro Tsuji
Summary: The dynamic transformation from alpha to beta phase in a zirconium alloy during hot compression was revealed by in-situ neutron diffraction. The transformation was accompanied by diffusion of Sn from beta to alpha phase, resulting in changes in lattice parameters and the microstructure of alpha grains. The occurrence of the dynamic transformation was attributed to an increase in the Gibbs free energy of the alpha phase relative to the beta phase, making the alpha phase thermodynamically more unstable than the beta phase.
Article
Materials Science, Multidisciplinary
Reza Gholizadeh, Shuhei Yoshida, Yu Bai, Shu Kurokawa, Akinobu Shibata, Nobuhiro Tsuji
Summary: In this study, the deformation behavior of the CoCrFeMnNi alloy under ultra-high strains at various temperatures was investigated. It was found that deformation twinning was extensively activated at moderate to high strains and at elevated temperatures above 600 degrees C. The alloy showed excellent deformability at low temperatures, but embrittlement occurred at intermediate temperatures. This research provides insights into the microstructure evolution and mechanical response of the Cantor alloy under shear deformation at a wide range of strains and temperatures.
Article
Metallurgy & Metallurgical Engineering
Sho Matsui, Kohsaku Ushioda, Hidetoshi Fujii
Summary: Resistance spot welding is widely used in automobile assembly, but it results in a decrease in cross-tension strength (CTS) when high-strength steel sheets are used. Friction element welding (FEW) was explored as an alternative to improve CTS by joining high-strength steel sheets. However, even with FEW, the CTS still decreased at the joint when a high-carbon-content steel sheet was used as the lower sheet. This decrease in CTS was attributed to the low local ductility caused by the large hardness difference (.Hn) between martensite (M) and ferrite ( a) in the inter-critically annealed and quenched area during joining.
ISIJ INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Meng-ran Zhou, Yu-feng Sun, Yoshiaki Morisada, Qing-yu Shi, Hidetoshi Fujii
Summary: This study systematically analyzed the mechanism of texture weakening in double-sided friction stir welded magnesium alloy. The results revealed that welding temperature and material flow mode simultaneously control the randomization of (0001) texture. The unique material flow at the mid-thickness layer caused by double-sided friction stir welding was identified as the dominant mechanism for texture randomization.
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
(2023)
Article
Multidisciplinary Sciences
Yan Chong, Reza Gholizadeh, Tomohito Tsuru, Ruopeng Zhang, Koji Inoue, Wenqiang Gao, Andy Godfrey, Masatoshi Mitsuhara, J. W. Morris, Andrew M. Minor, Nobuhiro Tsuji
Summary: Interstitial oxygen embrittles titanium, particularly at cryogenic temperatures, which necessitates a stringent control of oxygen content in fabricating titanium and its alloys. A structural strategy, via grain refinement, has been proposed to alleviate this problem. The unique synergy of strength and ductility in the ultrafine-grained (UFG) Ti-0.3wt.%O is achieved through diluted grain boundary segregation of oxygen and enhanced dislocation activities, resulting in improved grain boundary cohesive energy and excellent strain hardening ability. This strategy not only promotes the potential applications of high strength Ti-O alloys at low temperatures but can also be applied to other alloy systems.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Wu Gong, Stefanus Harjo, Yo Tomota, Satoshi Morooka, Takuro Kawasaki, Akinobu Shibata, Nobuhiro Tsuji
Summary: The martensitic transformation is accompanied by the generation of internal stresses at both microscale and macroscale during cooling. Previous studies using X-ray or neutron diffraction have reported inconsistent results due to the influence of factors such as solute elements and crystal defects on the measured lattice parameter.
Article
Nanoscience & Nanotechnology
Avala Lavakumar, Myeong-heom Park, Reza Gholizadeh, Ranjit Kumar Ray, Mitsuhiro Murayama, Nobuhiro Tsuji
Summary: Low-carbon multi-phased steels with transformation induced plasticity (TRIP) effect have attracted significant attention for automotive applications due to their superior mechanical balance between strength and ductility. However, the complex microstructural evolutions during thermo-mechanical processing and the influence of constituent phases on mechanical properties have not been fully understood. In this study, the formation process of multi-phased microstructures in a low alloy steel during intercritical annealing and subsequent partitioning heat-treatment were systematically investigated. The phase fractions of ferrite, martensite, and retained austenite were found to change significantly with increasing holding time at lower temperature. Newly formed ferrite was observed to transform from austenite through massive or bainitic transformation, resulting in different types of ferrite in the final microstructures. The presence of retained austenite was attributed to interstitial carbon diffusion, leading to improved tensile elongation and TRIP effect during deformation. The best strength-ductility balance was achieved with the shortest heat-treatment at lower temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Avala Lavakumar, Myeong-heom Park, Sukyoung Hwang, Hiroki Adachi, Masugu Sato, Ranjit Kumar, Mitsuhiro Murayama, Nobuhiro Tsuji
Summary: Deformation-induced martensitic transformation is a crucial phenomenon for achieving both high strength and large ductility in low alloy multi-phase steels. The transformation induced plasticity (TRIP) effect, which involves the phase transformation from austenite to martensite during deformation, can significantly enhance the strain hardening ability. The mechanical stability of austenite against martensitic transformation is influenced by the surrounding phases, but the details are still unclear.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Yan Chong, Jangho Yi, Guanyu Deng, Nobuhiro Tsuji
Summary: The aging behavior of Ti-1.0 wt pct Fe alloy was studied in this research, focusing on microstructural modifications within the beta grains. At lower aging temperatures, omega(ath) precipitates gradually decreased and were replaced by alpha(s) precipitates. At higher aging temperatures, alpha(s) precipitates increased in size while their volume fraction decreased, indicating a partial alpha to beta reverse phase transformation. The presence of omega(ath) promoted a homogeneous precipitation behavior of alpha(s) precipitates, leading to the formation of plate-shaped alpha(s) precipitates with multiple crystallographic variants.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Wu Gong, Takuro Kawasaki, Ruixiao Zheng, Tsuyoshi Mayama, Binxuan Sun, Kazuya Aizawa, Stefanus Harjo, Nobuhiro Tsuji
Summary: The deformation behavior of a commercial AZ31 magnesium alloy was studied during uniaxial compression at 21 K and 298 K using in-situ neutron diffraction. Decreasing the deformation temperature led to a slight increase in yield stress, but a remarkable enhancement in both the fracture stress and fracture strain. The low temperature sensitivity of the {10 (1) over bar2} extension twinning resulted in the slight increase in yield stress. At 21K, basal slip was suppressed, while extension twinning was promoted, leading to a higher twin volume fraction. The suppression of {10 (1) over bar1}-{10 (1) over bar2} double twinning in the late stage of deformation was considered to be the reason for the delayed fracture at 21 K.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Yan Chong, Reza Gholizadeh, Kaichi Yamamoto, Nobuhiro Tsuji
Summary: The coarse lamellar microstructure of as-cast alpha+beta titanium alloys can be effectively refined by boron additions, which has mainly been attributed to the precipitation of TiB whiskers that pin the growth of prior beta grains. We report an alternative mechanism of colony refinement in Ti-6Al-4V alloy containing trace amounts of boron solutes (0.02 wt.%). Using atom probe tomography, it is discovered for the first time that boron solutes segregate at the alpha/beta phase boundaries, due to its negligible solubilities in both alpha and beta phases. These segregated boron solutes at the alpha/beta phase boundaries restrict an easy growth of grain boundary alpha, and in turn promote the nucleation of more grain boundary alpha variants that serve as nucleation sites of alpha colonies. Hence, the colony size can be substantially refined without the formation of TiB whiskers that could be harmful to the ductility of the material.
SCRIPTA MATERIALIA
(2023)
Article
Nanoscience & Nanotechnology
Avala Lavakumar, Shuhei Yoshida, Jesada Punyafu, Shiro Ihara, Yan Chong, Hikaru Saito, Nobuhiro Tsuji, Mitsuhiro Murayama
Summary: The study focuses on the influence of grain size and temperature on the mechanical properties of equiatomic FeCoNi alloy. Different grain sizes ranging from ultra-fine to coarse were achieved by high-pressure torsion and annealing. The results show that the tensile yield strength is affected by temperature and grain size, and the grain boundary strength remains constant while the friction stress increases at lower temperature. At cryogenic temperature, the presence of nano twinning contributes to the enhancement of strength and ductility in addition to dislocation slip.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Jeong-Won Choi, Weihao Li, Kohsaku Ushioda, Motomichi Yamamoto, Hidetoshi Fujii
Summary: This study investigated the effects of stacking fault energy (SFE), temperature, strain, and strain rate on microstructural evolution and dynamic recrystallization (DRX) mechanism during linear friction welding (LFW) of face-centered cubic materials, specifically Al alloys (AA1050 and AA5052). The results showed that the temperature played a crucial role in the microstructural evolution, with high temperatures leading to continuous DRX and low temperatures resulting in discontinuous DRX. The grain structure and texture evolution depended on various parameters, with strains and strain rates dominating at temperatures above 0.5Tm and the SFE influencing at temperatures below 0.5Tm. Additionally, the Zener-Hollomon parameters of the Al alloy joints were investigated, and it was found that the AA5052 joints had a larger grain diameter than the AA1050 joints at lower Z values, but a smaller grain diameter at higher Z values. These differences were attributed to the lower SFE of AA5052, which promoted DRX and grain refinement during LFW.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Wenqi Mao, Si Gao, Wu Gong, Yu Bai, Stefanus Harjo, Myeong-Heom Park, Akinobu Shibata, Nobuhiro Tsuji
Summary: This study performed tensile deformation with in situ neutron diffraction measurement on an Fe-24Ni-0.3C (wt.%) TRIP-assisted austenitic steel, and proposed an analysis method based on stress partitioning and phase fractions measured by neutron diffraction. The results showed that both the transformation rate and the phase stress borne by the deformation-induced martensite played important roles in the global tensile properties of the material. The proposed decomposition analysis method could be widely applied to investigating mechanical behavior of multi-phase alloys exhibiting the TRIP phenomenon.
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)
