Article
Nanoscience & Nanotechnology
Chuyi Duan, Aleksander Kostka, Xiaohu Li, Zirong Peng, Peter Kutlesa, Reinhard Pippan, Ewald Werner
Summary: Dendritic microstructures in refractory high-entropy alloys can be homogenized by high-pressure torsion at room temperature, eliminating the need for long-term heat treatment. In this study, MoNbTaTiVZr alloy was processed by high-pressure torsion, resulting in the elimination of dendritic microstructure and the formation of a chemically homogeneous ultra-fine grained (UFG) microstructure. The microhardness of the alloy increased from 500 HV to 675 HV in the homogenized UFG state. The mechanisms responsible for the microhardness enhancement, including grain refinement and solid solution strengthening, were discussed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Yufang Zhao, Yaqiang Wang, Kai Wu, Jinyu Zhang, Gang Liu, Jun Sun
Summary: Introducing heterogeneous interfaces by constructing laminated structure is a promising approach to achieve controllable strengthening behavior of high entropy alloys. In this study, the microstructural evolution and mechanical properties of Ni/Fe50Mn30Co10Ni10 nanolaminates were systematically investigated. The nanoindentation hardness of the nanolaminates initially increased and then decreased with decreasing layer thickness, reaching a maximum value at around 25 nm. The transformation of constraining barrier for dislocation slipping from the heterogeneous interfaces to columnar grain boundaries was identified as the cause for this behavior. The interfacial structure transformed from incoherent to completely coherent below 25 nm, and both constituent layers contributed significantly to the plastic deformation. The h-dependent mechanical behavior can be explained by the co-deformation of constituent layers and the structural evolution of the interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Mechanical
William M. Williams, Mitra Shabani, Paul D. Jablonski, Garrett J. Pataky
Summary: CoCrFeNi alloy exhibits good steady-state fatigue crack growth resistance at room temperature, with the plastic deformation mechanism transitioning from dislocation slip to the addition of nano-twinning as crack life progresses.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Engineering, Mechanical
Y. X. Li, Raymond Kwesi Nutor, Q. K. Zhao, X. P. Zhang, Q. P. Cao, X. D. Wang, S. S. Sohn, D. X. Zhang, S. Q. Ding, H. F. Zhou, J. W. Wang, J. Z. Jiang
Summary: In this study, the tensile deformation behavior of a face-centered cubic (FCC)-structured Fe45Co25Ni10V20 high-entropy alloy at cryogenic temperature (77 K) is investigated. The alloy exhibits an impressive tensile strength of 1.1 GPa and an ultrahigh fracture elongation of 82%, with minimum strain hardening rate at a true strain of about 40%. These unique mechanical properties are attributed to the strain-induced FCC to body-centered cubic (BCC) martensitic transformation, which is stimulated by high-stress concentrations at grain boundaries or inter-section of stacking faults. The martensitic transformation induces strain softening by consuming stored deformation energy and contributes to strain hardening through the transformation itself and further deformation of BCC phases. This dynamic balance between softening and hardening enables a relatively uniform plastic flow, resulting in plastic deformation with a strain range of up to 35%, delaying macroscopic necking. The findings provide further insights into the significance of transformation-induced plasticity effects on the cryogenic performance of alloys.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Materials Science, Multidisciplinary
Yuan Li, Zhong Yang, Ping Wang, Hongbo Duan, Wei Yang, Zhijun Ma, Chao Wu, Jianping Li
Summary: The evolution of the microstructure and mechanical properties of a vacuum arc melted non-equiatomic Al0.4Co0.5V0.2FeNi high-entropy alloy subjected to severe plastic deformation was investigated. The alloy exhibited a duplex structure with dispersed B2-phase islands in FCC grains. The mechanical properties of the alloy were highly dependent on deformation, with an increase in deformation resulting in increased yield strength and ultimate tensile strength. Fractures occurred in the FCC phase near the interface between FCC and BCC phases, and the fracture degree increased with deformation, with fractures also appearing in the BCC phase.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Physical
Ying Wang, Junsong Jin, Mao Zhang, Famei Liu, Xinyun Wang, Pan Gong, Xuefeng Tang
Summary: Plastic deformation weakens the protective ability of the passive film, increases electrochemical dynamics and galvanic corrosion rate, consequently lowering the corrosion resistance of CrCoFeMnNi high entropy alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Wei Zhang, Zhichao Ma, Dongni Liu, Shenghui Wang, Hongwei Zhao, Luquan Ren
Summary: The mechanical properties of mixed-phase high-entropy alloy were investigated at small scale using micro-pillar compression tests. It was found that the interfacial region of the mixed-phase pillars exhibited higher strength, which was attributed to the synergetic strengthening of incoherent and coherent interfaces.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
S. Picak, H. C. Yilmaz, I Karaman
Summary: High temperature equal channel angular pressing (ECAP) was used to activate simultaneous twinning-induced (TWIP) and transformation-induced plasticity (TRIP) in the CoCrFeMnNi high entropy alloy (HEA), resulting in a high strength level and uniform plastic deformation ability. This phenomenon was attributed to the high strength levels applied via ECAP and the relatively low stacking fault energy of the present HEA.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Lingyi Liao, Qiang Wan, Yin Luo, Binyuan Jia, Wenhao Ma, Bing Yang, Jin Wan
Summary: This study investigates the method and mechanism of improving the surface properties of FeCoCrNiMn HEA through laser shock peening (LSP). The results suggest that LSP treatment leads to the formation of ultra-fine grains and high density of defects, resulting in significant enhancement of hardness, coefficient of friction, and corrosion resistance. The mechanisms of this strengthening effect include the suppression of dislocation movement by grain boundaries and defects, as well as the prevention of corrosive solution penetration by compressive residual stress induced by LSP.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Jeimmy Gonzalez-Masis, Jorge M. Cubero-Sesin, Alexander Campos-Quiros, Kaveh Edalati
Summary: In this study, biocompatible nanostructured high-entropy alloys were successfully synthesized using the high-pressure torsion method. The research compared the characteristics of different alloys and found that as the number of principal elements increased, hardness increased and grain size decreased, but these variations became less significant with further increase in configurational entropy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Spencer Doran, Yonggang Yan, Liuqing Yang, Jae-Kyung Han, Di Chen, Kun Wang, Youxing Chen, Megumi Kawasaki, Tianyi Chen
Summary: Nanocrystalline materials often experience radiation-enhanced grain coarsening, but high entropy alloys (HEA) may have superior radiation tolerance due to their intrinsic sluggish diffusion. In this study, CoCrFeNiMn HEA samples were processed via high-pressure torsion (HPT) to form nanograins with unsaturated and saturated plastic deformation. After Ni ion irradiation, grain growth was observed in both samples, but the 8T sample showed stronger radiation tolerance. This resistance is attributed to a unique nanodomain microstructure formed within the radiation-coarsened grains of the 8T sample.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Ruoyu Liu, Chu Wang, Bin Liu, Yong Liu, Peter K. Liaw, Bingfeng Wang
Summary: High-entropy alloys (HEAs) containing nanotwins demonstrate both high strength and excellent plasticity. This study investigates the instantaneous formation mechanism of nanotwins in a shear band in the hot-extruded FeCoNiCrMo0.2 HEA. The results show that the shear band consists of elongated sub-grains, nanotwins, and equiaxed grains, with nanotwins mainly existing in a lamellar form. The nanotwins in the shear band possess a high strength of about 1500 MPa and good plasticity, with a true strain reaching 3.6.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
O. Deluigi, N. Amingo, F. J. Valencia, F. Aquistapace, D. R. Tramontina, R. I. Gonzalez, Eduardo M. Bringa
Summary: This study investigates the plastic behavior of nanoporous high-entropy alloys (HEA) under compression through molecular dynamics simulations. The results reveal that chemical complexity affects dislocation nucleation and twinning activity, leading to accelerated reduction of nanopores.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Abbas Mohammadi, Marc Novelli, Makoto Arita, Jae Wung Bae, Hyoung Seop Kim, Thierry Grosdidier, Kaveh Edalati
Summary: High-strength materials often lack resistance to hydrogen embrittlement. In this study, gradient structures with surface nanotwins were introduced in a high-entropy alloy, resulting in materials with both high strength and good ductility under hydrogen. This research is significant for the development of hydrogen-resistant materials.
Article
Metallurgy & Metallurgical Engineering
Junwei Xie, Haokai Dong, Yuxiu Hao, Zhongding Fan, Chang-An Wang
Summary: Experimental studies were conducted on deformation twins initiated in CryMnFeCoNi high entropy alloy at cryogenic temperature. It was found that under external loading, a three-dimensional shear stress concentration originating from dislocation tangling at both the grain boundaries and twin boundaries could be formed, promoting emission of partial dislocations from the planar defects and thus considered to be the key factor for twin formation. A sympathetic nucleation mechanism was proposed to describe the nucleation behaviors of twins.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
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
Engineering, Multidisciplinary
Lei Zhang, Shuang Su, Wujing Fu, Jianfei Sun, Zhiliang Ning, Alfonso H. W. Ngan, Yongjiang Huang
Summary: The structural evolution near the crystalline/matrix interface in CuZr-based metallic glass composite (MGC) was investigated using in situ transmission electron microscope (TEM) tensile straining and molecular dynamics (MD) simulation. Plastic deformation of the crystalline phase occurred before the amorphous phase, involving recoverable martensite transformation, dislocation accumulation at the interface, and local amorphization between grains. Fracture did not occur along the interphase interface, but within the crystalline phase near the interface, indicating a strong interface and high work hardening rate of the crystalline phase. MD simulations revealed that the amorphous phase was marginally metastable compared to the stable B2 phase, while the B19' martensitic phase was metastable with higher energy, explaining the easy mutual transformation between B2 and amorphous phase, and the less frequent transformation product of B19' phase from B2 during straining.
COMPOSITES PART B-ENGINEERING
(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)
