Article
Materials Science, Multidisciplinary
Jiacheng Rong, Pengzhe Zhu, Yimeng Xu
Summary: This paper investigates the spallation process of metallic glass under different velocities by using molecular dynamics simulation and the piston method. The results show that higher loading velocities lead to higher material strain rates and temperatures, reducing the spall strength. The analysis reveals that icosahedral clusters are greatly reduced in spallation, and higher strain rates result in more voids and a larger spall region, with a change in the fracture surface characteristics.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Yang Yang, Jian Kong, Kewei Dong, Xiangkui Liu, Qipeng Wang, Xinxiang Song, Shuai Feng
Summary: This study presented an electro pulsive joining method for bulk metallic glass and systematically studied the mechanism of the joining process. Three different join modes were identified: supercooled liquid phase joining, crystallization joining, and liquid phase joining. Joint's average strength was measured and the electro pulsive joining method was proven to be a universal way for connecting bulk metallic glass.
Article
Materials Science, Multidisciplinary
Ahmad Saadati, Mehdi Malekan, Farzad Khodabakhshi
Summary: This study successfully prevented the crystallization of metallic glass and maintained dimensional accuracy by diffusion bonding below the glass transition temperature, utilizing the solid-state diffusion mechanism of elements to form dissimilar sound weldments with superior joint shear strength ratios.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Tianding Xu, Xiao-Dong Wang, Eric M. Dufresne, Yang Ren, Qingping Cao, Dongxian Zhang, Jian-Zhong Jiang
Summary: Anomalous fast atomic dynamics were discovered in a metallic glass with good glass forming ability, mainly attributed to the increased mobility of Cu atoms by Ag addition, leading to the formation of structural heterogeneity at the atomic level.
MATERIALS TODAY PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Mingcan Li, Huimin Guan, Sen Yang, Xu Ma, Qiang Li
Summary: A new strategy of minor substitution has been proposed to enhance the plasticity and yielding strength of ductile Fe-based bulk metallic glasses. The locally modified structure leads to improved resistance to shear band formation and propagation, resulting in significant improvement in both properties. One example is the development of (Fe1/3Co1/3Ni1/3)(77.5)Cr-2.5(P1/2B1/2) 20 high entropy bulk metallic glass, which shows substantial enhancement in plasticity and yielding strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Jie Chen, Bohua Li, Weizong Bao, Zeyun Cai, Guoqiang Xie
Summary: This study investigates the effect of ball milling speed on the microstructure, mechanical properties, and electrical properties of Cu/Cu-Zr-Al metallic glass composites. It is found that adjusting the milling speed can achieve high strength and high electrical conductivity simultaneously.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Zhiyuan Huang, Jianan Fu, Xin Li, Wenxin Wen, Hongji Lin, Yan Lou, Feng Luo, Zhenxuan Zhang, Xiong Liang, Jiang Ma
Summary: This study presents a method of ultrasonic-assisted rapid cold welding of metallic glasses without using any additives, achieving stable bonding of MG interface under high-frequency ultrasonic vibration, low temperature and low stress conditions. The ultrasonic technology accelerates atomic diffusion process, enabling rapid bonding of different compositions of MGs and potential for tuning new materials with new performance.
SCIENCE CHINA-MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Xiangcheng Cui, Weihua Hu, Xing Lu, Yunzhuo Lu
Summary: Introducing ductile crystalline dendrites into a glassy matrix is an effective way to improve the ductility of bulk metallic glasses. A lamellated Zr-based BMGC fabricated using flexible laser additive manufacturing shows exceptional strength-ductility synergy. This design motif provides a new window for the development of high-performance BMGCs and can be applied to enhance the strength and plasticity of other brittle metallic materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
He Ma, Dandan Qin, Chun Shang, Yunzhuo Lu
Summary: In this study, a layered metallic glass composite with high yield strength and compression ductility was successfully synthesized via laser additive manufacturing. The unique structure and asynchronous deformation of the material contribute to its remarkable mechanical properties, offering a new paradigm for designing engineered materials with excellent strength and ductility.
Article
Physics, Applied
Jiacheng Rong, Pengzhe Zhu, Yimeng Xu
Summary: In this study, molecular dynamics simulations were conducted to investigate the mechanical response of Cu50Zr50 metallic glass under double-shock loadings. Different phenomena such as recompaction, second spallation, uncompaction, or non-spallation were observed. The characteristics of these phenomena were analyzed through the damage area, stress distribution, density, and temperature. This study provides insights into the dynamic response of metallic glasses under double-shock loadings.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Ju Wang, Ivan Kaban, Volodymyr Levytskyi, Ran Li, Junhee Han, Mihai Stoica, Roman Gumeniuk, Kornelius Nielsch
Summary: Co-Ta-B bulk metallic glasses exhibit a good combination of ultra-high fracture strength, Vickers hardness, and plastic strain. The crystallization process reveals the formation of a novel crystalline phase upon glass annealing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Devashish Rajpoot, R. Lakshmi Narayan, Long Zhang, Punit Kumar, Haifeng Zhang, Parag Tandaiya, Upadrasta Ramamurty
Summary: Fracture behavior of bulk metallic glass matrix composites with both transforming and non-transforming fi-Ti dendrites under shear and opening modes was examined, showing lower fracture toughness in mode II due to shear dominant stress state and considerable crack growth in this mode. Despite the ability of transforming dendrites to strain harden and enhance ductility, BMGCs reinforced with non-transforming dendrites exhibit higher toughness in both modes. Shear band patterns suggest identical fracture mechanism in BMGCs and BMGs, with differences rationalized by the effect of relaxation enthalpy and dendrites length scale.
Article
Nanoscience & Nanotechnology
N. B. Zhang, Z. J. Tang, Z. H. Lin, S. Y. Zhu, Y. Cai, S. Chen, L. Lu, X. J. Zhao, S. N. Luo
Summary: Plate impact experiments were conducted on a heterogeneous-structured high-entropy alloy to investigate its microstructure and shock-induced deformation. Different types of domains exhibited varying deformation mechanisms and changes in dislocation density. The heterogeneous structure had minimal impact on spall strengths due to the grain refinement and plastic deformation at the domain boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Review
Materials Science, Multidisciplinary
Cheng Zhang, Di Ouyang, Simon Pauly, Lin Liu
Summary: Bulk metallic glasses (BMGs) as metallic materials without long-range order have attracted significant attention from academia and industry in the past three decades. The emerging 3D printing technology provides a viable route to overcome the challenges inherent in conventional processing routes and expand the applications of BMGs.
MATERIALS SCIENCE & ENGINEERING R-REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Limin Lai, Tianhao Liu, Xinghong Cai, Min Wang, Shengbiao Zhang, Wen Chen, Shengfeng Guo
Summary: The study introduces a series of low-cost refractory Mo-Co-B BMGs with enhanced GFA and high thermal stability, exhibiting exceptional hardness and Young's modulus.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Zida Zhang, Pengcheng Che, Jian Zhang, Hongbo Fan, Zhiliang Ning, Jianfei Sun, Yongjiang Huang
Summary: The effect of H+-ion irradiation on the structure and properties of a Cu50Zr50 metallic glass (MG) is investigated. The results show that the glass maintains its amorphous nature after ion irradiation, and the ion fluence increases shorten the atomic bond length, increase the nanohardness and Young's modulus, and enhance the corrosion resistance of the MG.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Thermodynamics
Chaojun Zhang, Fuyang Cao, Lunyong Zhang, Zhishuai Jin, Guanyu Cao, Ziao Qiu, Hongxian Shen, Yongjiang Huang, Sida Jiang, Jianfei Sun
Summary: This study presents an advanced numerical simulation to explain the mechanism of melt superheat temperature in induction skull melting technology. The coupling model established accurately predicts the temperature and meniscus shape in the research domain. The simulation results reveal that forced convective heat transfer caused by electromagnetic force and the current passing through phenomenon between molten melt and crucible are key factors influencing the superheat temperature and electrical efficiency.
APPLIED THERMAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Hangboce Yin, Jun-Qiang Wang, Yongjiang Huang, Hongxian Shen, Shu Guo, Hongbo Fan, Juntao Huo, Jianfei Sun
Summary: The new high-entropy metallic-glasses (HE-MGs) are designed using Dy and Ho instead of Gd in the Gd36Tb20Co20Al24 alloy based on the binary eutectic clusters method. The non-equiatomic RE36Tb20Co20Al24 (RE = Gd, Dy, or Ho) alloys show improved glass-forming ability compared to the equiatomic Gd25Tb25Co25Al25 alloy. The Ho36Tb20Co20Al24 alloy exhibits an extreme value of magnetic entropy change, indicating its potential for magnetocaloric applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Lu Li, Lina Hu, Lunyong Zhang, Yongjiang Huang, Kaikai Song, Hongxian Shen, Sida Jiang, Zheng Wang, Xi Zhao, Jianfei Sun
Summary: The research on liquid-liquid transition (LLT) has greatly enhanced the understanding of the liquid structure and evolution, with significant implications for glass formation. However, the impact of LLT on vitrification and glass structures is still unclear due to experimental challenges in exploring LLT in high-temperature melts. This study examines LLT in Zr-Cu-Ni-Al melts and reveals that superheated fragility is closely related to glass-forming ability. The competition between crystal-like and icosahedral-like clusters affects the crystallization behavior and changes in both medium-range order structure and short-range order structure indicate LLT.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Zhishuai Jin, Fuyang Cao, Guanyu Cao, Chaojun Zhang, Ziao Qiu, Lunyong Zhang, Hongxian Shen, Sida Jiang, Yongjiang Huang, Mingzhen Ma, Eckert Juergen, Jianfei Sun
Summary: This study investigates the solidification dynamics during casting of a Zr41.2-Ti13.8Cu12.5Ni10Be22.5 BMG by measuring temperature evolution and constructing distance-time curves. The results show that the casting temperature plays a crucial role in the cooling rate and the formation of nanocrystal phases in BMG components, emphasizing the importance of optimizing the casting temperature for fabrication of BMG components.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Chemistry, Physical
Wei Yue, Hongbo Fan, Weinan Ru, Zhaoxuan Wu, Zhixiong Zhang, Lunyong Zhang, Zhiliang Ning, Jianfei Sun, Shu Guo, Yongjiang Huang
Summary: Emerging high-entropy alloys (HEAs) exhibit superior mechanical properties due to a synergy of multiple deformation mechanisms and their interactions. In this study, in-situ tensile deformation of a CrMnFeCoNi HEA at room temperature was conducted, revealing the effects of dislocation activity, slip band activation, and interactions on strain hardening rate. The alloy demonstrated high fracture toughness, with cracks initiating at slip zones and grain boundaries and propagating gradually to final fracture.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Lei Zhang, Jianfei Sun, Hongbo Fan, Zhiliang Ning, Yongjiang Huang
Summary: In metallic glass composites (MGCs), the presence of crystalline phases leads to structural heterogeneity in the amorphous matrix near the crystalline phase, resulting in differences in mechanical properties at the micro- or nano-scale near the crystalline/matrix interface. This study quantitatively relates the pile-up height to the activation volume of shear transformation zones (STZs) to characterize this difference using nanoindentation technology. Molecular dynamics simulations were conducted to investigate the activation behaviors of STZs during the nanoindentation process of the amorphous matrix, and the influences of crystalline phases on the deformation behaviors of the amorphous matrix near the interface in MGCs were analyzed in detail.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Multidisciplinary
Lei Zhang, Jianfei Sun, Alfonso H. W. Ngan, Zhiliang Ning, Hongbo Fan, Yongjiang Huang
Summary: Amorphous alloy composites (AACs) with reinforcing crystalline phases exhibit superior mechanical properties compared to their base amorphous alloy counterparts. A study on Cu-Zr based AACs reveals that the B2 phase particles embedded in the amorphous matrix are actually heterogeneous at the sub-micron scale, and the amorphous phase exhibits a gradient in free volume content towards the interface. This research provides valuable insights into the crystallization mechanism of the iso-stoichiometric B2 phase in Cu-Zr based AACs.
COMPOSITES PART B-ENGINEERING
(2023)
Article
Chemistry, Physical
Lei Zhang, Hongge Li, Houyi Bai, Zhiliang Ning, Jianfei Sun, Yongjiang Huang
Summary: The structure features of Cu62Zr34.4Al3Nb0.6 amorphous alloy composites (AACs) were studied using experimental characterization and first-principles calculation. Element segregation, a common phenomenon in conventional alloy materials, does not occur in the two phases (crystalline and amorphous) of AACs due to complex solid solution. By calculating different structural models, including interstitial solid solution, substitutional solid solution, B2, and amorphous phase, the lattice parameters, electron distribution, charge transfer, and electrical potential, which are directly related to atomic bonding and lattice parameters, were obtained. Finally, the formation and stability of solid solution in the crystalline and amorphous phases were elucidated using first-principles calculation. This work has important guiding significance for understanding the two-phase structure and solidification mechanism in AACs materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Tianxu Zhao, Songshan Jiang, Qingxin Cui, Xianxue Zhang, Zhiliang Ning, Hongbo Fan, Jianfei Sun, Yongjiang Huang
Summary: In this study, the deformation behaviors of a Cu47.5Zr48Al4Nb0.5 bulk metallic glass composite (BMGC) in the temperature ranging from 663 K to 763 K have been investigated. The studied BMGC exhibits superplasticity within the supercooled liquid region (SLR) and the deformation involves both homogeneous and inhomogeneous modes. The temperature dependence of deformation behaviors in BMGCs was better understood through this study.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyu Gao, Jian Liu, Wujing Fu, Yongjiang Huang, Zhiliang Ning, Zhixiong Zhang, Jianfei Sun, Wen Chen
Summary: This study introduces a heterogeneous gradient structure into CoCrFeNi high-entropy alloy microfibers through thermomechanical processing, achieving an excellent combination of high strength and ductility. The microfibers show ultrahigh yield strength and outstanding uniform elongation at low temperatures, thanks to the ultrafine grains, heterogeneous gradient structure, and activation of multiple deformation mechanisms.
MATERIALS & DESIGN
(2023)
Article
Nanoscience & Nanotechnology
Sijia Wang, Jixin Yang, Jianfei Sun, Wenxiang Shu, Haibin Yang, Alfonso H. W. Ngan, Yongjiang Huang
Summary: Here, TA15 samples near alpha titanium alloy were fabricated using electron beam selective melting (EBSM), and their high-temperature tensile deformation behaviors were studied. The results showed that the samples exhibited work hardening and softening at different temperatures, and the EBSM-built TA15 samples had excellent mechanical properties at medium temperatures. These findings are helpful for the industrial applications of EBSM-built titanium alloy components in the aerospace fields.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Sijia Wang, Feiya Guo, Zhiliang Ning, Houyi Bai, Hongge Li, Hongbo Fan, Jianfei Sun, Yongjiang Huang
Summary: This study investigated the structural and tensile deformation behaviors of cold-drawn Cu47.5Zr47.5Al5 amorphous alloy (AA) microwires compared to melt-extracted ones. The results showed that cold-drawn wires still maintained their amorphous structure. The cold-drawing process led to fewer surface defects, higher local order degree, and greater compressive residual stress, resulting in higher tensile fracture strength and reliability compared to melt-extracted ones. This study demonstrated that cold-drawing is an effective method to enhance the mechanical performance of AA wires.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Coatings & Films
Yang Lv, Wei Yue, Zheng Cao, Zhe Zhang, Hongbo Fan, Zhiliang Ning, Jianfei Sun, Peter K. Liaw, Yongjiang Huang
Summary: Laser-shock peening (LSP) is widely used to improve the mechanical properties of metallic components. In this study, the structure and nano-mechanical behaviors of a Ti40Zr25Ni3Cu12Be20 bulk metallic glass (BMG) before and after LSP processing were investigated. The LSP-treated BMG sample remains amorphous, and there is a reduction in local order extent with increasing laser-beam energy, leading to an increase in free-volume contents. The higher free-volume content results in a greater shear-band density and lower nano-hardness in the studied BMG samples.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Thermodynamics
Chaojun Zhang, Lunyong Zhang, Fuyang Cao, Zhishuai Jin, Guanyu Cao, Ruishuai Gao, Ziao Qiu, Hongxian Shen, Yongjiang Huang, Jianfei Sun
Summary: This study proposes a full-scale coupling simulation model for understanding the melting process of metallic glass components during induction skull melting (ISM) using finite element method. Through experimental and numerical investigation, the distribution of physical fields and melt homogeneity in the melting process are analyzed.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
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)