Article
Engineering, Chemical
Cheenepalli Nagarjuna, Kwang Yong Jeong, Yeeun Lee, Shin Min Woo, Sun Ig Hong, Hyoung Seop Kim, Soon-Jik Hong
Summary: In this study, an equiatomic CoCrFeMnNi high entropy alloy (HEA) was fabricated by a rapid solidification gas atomization process and further refined by high-energy mechanical milling. The results showed that the powder morphology changed significantly with increasing milling time and the HEA exhibited improved hardness and compressive yield strength. The 60 min milled HEA demonstrated the lowest coefficient of friction and specific wear rate, indicating that the developed powder metallurgy approach has the potential to enhance the strength and wear resistance of HEAs.
ADVANCED POWDER TECHNOLOGY
(2022)
Article
Chemistry, Physical
Hansung Lee, Ashutosh Sharma, Byungmin Ahn
Summary: This study investigates the influence of Si addition on the microstructure, compressive strength, and fracture mechanisms of FeCoNiAlSi high-entropy alloys (HEAs). The results show that the addition of Si changes the phase structure of the alloy and increases its Vickers hardness and compressive strength. The findings suggest that HEAs with different Si contents can be used for designing high-strength structural alloys for automotive applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Zhen Zhang, Qianqian Wang, Dikunqi Mu, Gaoyuan Shen, Mohan Liu, Mai Zhang, Sammy Lap Ip Chan, Jiamiao Liang, Jun Wang
Summary: The CoCrFeNiAl0.3 high entropy alloy samples were produced using different ball milling strategies, and the microstructure and phase formation were investigated. The study found that mechanical mixing resulted in a mixture of FCC and BCC structured matrix, as well as intermediate multiphases, while mechanical alloying produced a single phase FCC matrix. The microstructure exhibited good thermal stability, attributed to the pinning effects of dispersed Al2O3 nanoparticles. The Al2O3 nanoparticles played a dominant role in improving the mechanical properties.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Byungchul Kang, Taeyeong Kong, Nguyen Huy Dan, Doan Dinh Phuong, Ho Jin Ryu, Soon Hyung Hong
Summary: The addition of boron to a refractory high-entropy alloy (RHEA) significantly improves its yield strength and ductility, transforming the fracture surface and enhancing the material's ductility due to boron segregation along grain boundaries. Boron segregation contributes to increased grain boundary cohesion, leading to enhanced yield strength. The improved yield strength attributed to boron doping is a result of the combined effects of Orowan, dislocation, and boron interstitial strengthening mechanisms.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Byungchul Kang, Taeyeong Kong, Ho Jin Ryu, Soon Hyung Hong
Summary: The AlxCrNbVMo high-entropy alloys exhibited superior mechanical properties with a homogeneous microstructure and high yield strength at both 25 and 1000 degrees C, attributed to solid solution strengthening mechanism.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Youyou Zhang, Huibin Wu, Xinpan Yu, Di Tang, Rui Yuan, Hui Sun
Summary: In this study, the microstructure and mechanical properties of CrxMnFeNi high-entropy alloy were investigated. It was found that a dual-phase FCC/BCC structure was formed when the Cr content exceeded a threshold value. The presence of BCC phase in the dual-phase alloy significantly increased strength but decreased ductility, showing a good strength-ductility matching mechanism.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Cheenepalli Nagarjuna, JunWoo Song, Kwang Yong Jeong, Min-Wook Pin, Gian Song, Jin Kyu Lee, Young-Sang Na, Hyoung Seop Kim, Ki Buem Kim, Soon-Jik Hong
Summary: The FCC structured CoCrFeMnNi high entropy alloy (HEA) has attracted attention due to its excellent ductility and strain hardening ability. A new strategy called harmonic structure (HS) was developed to achieve high strength and ductility. HS consists of soft coarse and hard fine grains formed by controlled mechanical milling time. The hardness of HS HEAs increased with increasing distance from center to surface regions due to a reduction in grain size. Compared to homogeneous HEAs, HS HEAs exhibited increased yield strength and enhanced strain hardening ability.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Danni Yang, Yong Liu, Nan Qu, Tianyi Han, Mingqing Liao, Zhonghong Lai, Jingchuan Zhu
Summary: The effect of fabrication methods on microstructures, mechanical properties, and strengthening mechanisms of high-entropy alloys was systematically studied. Different fabrication methods have little effect on the main phase compositions of Fe0.25CrNiAl MEA, but significant impacts on microstructures, mechanical properties, and strengthening mechanisms were observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Xicong Ye, Zihao Cheng, Chang Liu, Xin Wu, Luer Yu, Mengyu Liu, Dong Fang, Guangwei Zhao, Bo Li
Summary: The emergence of eutectic high entropy alloys (EHEAs) has led to the design and preparation of a set of low-cost Co-free Fe55Cr15Ni(30-x)Nbx (x = 0, 3, 6, 9, 12, and 15 at.%) EHEAs in this study. The addition of Nb content affects the solidification structure and mechanical properties of the alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Cheenepalli Nagarjuna, Sheetal Kumar Dewangan, Hansung Lee, Byungmin Ahn
Summary: A novel equiatomic CrFeNiTiV high entropy alloy (HEA) was synthesized through mechanical alloying and spark plasma sintering, and the effects of heat treatment temperature on the phase stability and mechanical properties were investigated. The results showed that the phase and mechanical properties of the HEA were improved after heat treatment, making it suitable for high-temperature applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Review
Materials Science, Multidisciplinary
Jing Xue, Fang Luo, Yali Zhang, Yongjian Fang, Xiaosong Jiang
Summary: Titanium (Ti) is widely used in biomedical implants due to its excellent mechanical properties and biocompatibility. However, the stress shielding effect limits its application. Incorporating bioactive elements into titanium alloys, such as magnesium (Mg), can provide specific biological functions through sustained release. Despite the incompatibility between Ti and Mg, Ti-Mg composites have potential for biomedical applications, and their preparation methods, properties, and biocompatibility are discussed in this review.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Chenzeng Zhang, Cunguang Chen, Pei Li, Mengjie Yan, Qian Qin, Fang Yang, Wenwen Wang, Zhimeng Guo, Alex A. Volinsky
Summary: Powder metallurgy Cu-30Fe alloy was prepared using mechanical alloying, pressureless sintering, and rolling processes. The rolling process affected the alloy microstructure and physical properties. The Fe particles became elongated and changed shape, while the Cu grains became elongated and refined. The coordinated deformation of the Cu and Fe phases resulted in finer Cu grains near the Fe particles. After annealing, the cold-rolled Cu-30Fe alloy achieved a good combination of mechanical and functional properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Shengguo Ma, Yanjie Li, Shuo Li, Bin Xu, Tuanwei Zhang, Zhiming Jiao, Dan Zhao, Zhihua Wang
Summary: Introducing a gradient-structured Al0.1CoCrFeNi high-entropy alloy through simple torsional methodology achieves a good combination of strength and ductility. The synergistic strengthening effect from GS yields a unique up-turn behavior in strain-hardening-rate response, with nanoindentation hardness measurements and theoretical predictions further confirming this feature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Sujung Son, Peyman Asghari-Rad, Alireza Zargaran, Wen Chen, Hyoung Seop Kim
Summary: This study successfully fabricated a nanostructured CoCrFeNi medium-entropy alloy with excellent tensile properties through cold powder consolidation and annealing techniques. The enhanced tensile strength at cryogenic temperatures can be attributed to intensive mechanical twin activities. Engineering the microstructure through subsequent annealing leads to a desirable synergy of strength and ductility, which is of great importance in structural applications.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Azmi Erdogan, Ali Gunen, Mustafa Sabri Gok, Sakin Zeytin
Summary: CoCrFeNiAl0.25Ti0.5 high entropy alloy alloys were borided to improve their mechanical properties, resulting in significant increases in surface hardness. However, increasing the boriding temperature led to thicker and harder boride layers, but decreased fracture toughness.
Article
Nanoscience & Nanotechnology
Dengshan Zhou, Yifan Bu, Ondrej Muransky, Hongwei Geng, Binhan Sun, Chao Yang, Deliang Zhang
Summary: This study shows that annealing can induce strengthening in bulk ultrafine-grained Al-Mg based alloys by promoting in-situ formation of nanoscale dispersoids. These dispersoids effectively suppress grain growth and recrystallization, ensuring high thermal stability and good ductility of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Junjia Zhang, Zhaoyu Liu, Zhongkai Guo, Shichao Liu, Yong Dong, Ying Fu, Jinchuan Jie, Deliang Zhang
Summary: The addition of Zr significantly improves the microstructure and mechanical properties of Cu-Ni-Sn alloys by controlling dendritic morphology and changing the form of precipitation phases. The presence of Zr inhibits the formation of discontinuous precipitation, extends the aging window, and results in the optimal combination of properties for the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Lei Meng, Youyun Zhang, Mengchao Zang, Mengrui Zhang, Cong Wang, Yu Wang, Xiaoli Zhao, Deliang Zhang
Summary: In this study, Ti-6Al-4V alloy samples with two bi-lamellar microstructures were prepared and analyzed. The alloy with higher Al concentration in the primary alpha lamellae and finer scale of beta t structure lamellae exhibited higher nano hardness and yield strength. The hardening mechanism mainly comes from the hardening of alpha and beta(t) lamellae, as well as the heterostructure induced hardening, while the significantly higher flow stress induced a higher degree of trans-lamellar twinning.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Xiguang Deng, Deliang Zhang, Qingyang Jiao, Songxiao Hui, Wenjun Ye, Lina Zou, Zhisheng Nong
Summary: The Schmid factors of grains in a Ti-2Al alloy were determined and used to investigate the twinning behavior during deformation at different temperatures. It was found that the fraction of twinned grains decreased with increasing deformation temperature. The critical resolved shear stress required to activate twinning was calculated and found to decrease linearly with increasing deformation temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
H. R. Zhang, H. Z. Niu, S. Liu, M. C. Zang, D. L. Zhang
Summary: This study investigated the tensile properties and deformation mechanism of a hot-extruded powder metallurgy near alpha-Ti alloy characterized by a regular lamellar microstructure. The alloy's ultimate tensile strength (UTS) and equivalent elongation to fracture (EI) were improved by utilizing a unique micro-texture. Furthermore, annealing resulted in the formation of a bi-lamellar microstructure, enhancing the mechanical performance of the alloy.
SCRIPTA MATERIALIA
(2022)
Article
Engineering, Multidisciplinary
Dengshan Zhou, Xiuzhen Zhang, Ali Tehranchi, Junhua Hou, Wenjun Lu, Tilmann Hickel, Dirk Ponge, Dierk Raabe, Deliang Zhang
Summary: Stacking faults (SFs) can be used to increase the strength and ductility of metal matrix composites. However, SFs are rarely observed in Al alloy matrix composites. In this study, SFs are introduced into an ultrafine-grained Al(Mg)-Al3Mg2 composite, resulting in improved yield strength and tensile elongation.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Xiaogang Wu, Bowen Zhang, Yanhu Zhang, Hongzhi Niu, Deliang Zhang
Summary: In this study, a method combining internal oxidation and thermomechanical consolidation was used to fabricate a near-alpha titanium alloy with low oxygen content, high tensile strength, and excellent tensile ductility. The addition of Y2O3 particles not only scavenged oxygen in the matrix but also acted as nucleants for heterogeneous nucleation, promoting the formation of alpha plates and inhibiting crack initiation and propagation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Xiuzhen Zhang, Dengshan Zhou, Yue Li, Deliang Zhang
Summary: In this study, dynamic strain aging and dynamic precipitation were combined through simple pre-deformation to increase the flow stress and strain hardening rate of a high Mg-content Al-Mg-Zn based crossover alloy. The experimental results showed significant improvement in both yield strength and ultimate tensile strength, while maintaining excellent ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Jingfan Zhang, Dengshan Zhou, Xueyong Pang, Bowen Zhang, Yue Li, Binhan Sun, Ruslan Z. Valiev, Deliang Zhang
Summary: By manipulating the grain size and alloying with yttrium, we have achieved the simultaneous formation of deformation twins and 9R structure in an Al-Mg alloy. Our study presents a new microstructure design strategy for strengthening bulk aluminum alloys through deformation twins and 9R structure and/or stacking faults.
Article
Chemistry, Physical
Xiaogang Wu, Bowen Zhang, Yanhu Zhang, Hongzhi Niu, Deliang Zhang
Summary: Powder metallurgy (PM) Ti-6Al-2Sn-4Zr-2Mo-0.1Si-(0, 2, 4)W (wt%) alloys with different W contents were fabricated and their microstructure and mechanical properties were studied. The addition of W changed the microstructure from parallel alpha/beta lamellar colonies to an interwoven alpha/beta t microstructure. The presence of W led to an increase in tensile strength but a decrease in ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Youyun Zhang, Lei Meng, Xiaoli Zhao, L. De Los Santos Valladares, A. Bustamante Dominguez, Deliang Zhang
Summary: Powder metallurgy Fe-22Mn (wt.%) steel rods were fabricated, and their microstructures and tensile properties were investigated. Increasing the extrusion ratio resulted in significant changes in the volume fractions of different phases, leading to changes in yield strength and strain hardening capacity. Annealing at 1200°C caused segregation of Fe atoms in the Fe-Mn oxide particles, resulting in decreased hardness and Young's modulus, and reduced ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Zhen Zhang, Jiamiao Liang, Tian Xia, Yuehuang Xie, Sammy Lap Ip Chan, Jun Wang, Deliang Zhang
Summary: An AA6061 aluminum alloy tube was fabricated via thermomechanical consolidation. The microstructure evolution, formation of oxide particles, and tensile mechanical properties were investigated. It was found that fine Al/Mg oxide particles inhibited grain growth and led to the formation of a microstructure consisting of coarse elongated grains and fine equiaxed grains. T6 heat treatment resulted in a microstructure with finer grains. Good combination of strength and ductility was achieved in the heat treated samples due to high-quality bonding and inhibition of crack growth by the oxide particles.
Article
Materials Science, Multidisciplinary
Yifei Luo, Yuehuang Xie, Zhen Zhang, Jiamiao Liang, Deliang Zhang
Summary: A Ti-6Al-4V alloy with a dual harmonic structure was successfully fabricated by controlling grain sizes and element contents. This structure helps reduce mechanical mismatch and enhances strength and ductility.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
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)