Article
Nanoscience & Nanotechnology
C. Ren, K. Sun, Y. F. Jia, N. Z. Zhang, Y. D. Jia, G. Wang
Summary: The study examined the microstructural evolution and mechanical properties of (FeNi)67Cr15Mn10-xAl4Ti4Mox high entropy alloys. It was found that the substitution of Mn by Mo introduced hard a precipitates into the matrix and significantly refined the grains, leading to the increase in yield strength. However, the formation of the hard a precipitates hindered the work hardening process and decreased the plasticity, resulting in a decrease in elongation at break. The highest ultimate tensile stress was obtained at x = 4, where the fracture morphology changed from a coarse grain morphology to a typical brittle fracture. Therefore, (FeNi)67Cr15Mn6Al4Ti4Mo4 showed the optimal mechanical properties overall.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
H. Heydari, M. Tajally, A. Habibolahzadeh
Summary: Al11Li10Mg23Ti21Zr35 was designed as a novel Light High Entropy Alloy (LHEA) by considering phase formation rules. The alloy showed approximate chemical homogeneity, with the presence of HCP solid solution phase and AlZr2 intermetallic compounds. It achieved high specific hardness among all LHEAs introduced up to now. The distortion of the alloy's crystal structures, caused by elements with different atomic radii, was proposed as the dominant mechanism contributing to its properties.
Article
Nanoscience & Nanotechnology
Xicong Ye, Jinyan Xiong, Xin Wu, Chang Liu, Dong Xu, Wen Zhang, Dong Fang, Bo Li
Summary: A new infinite solid solution strategy was proposed in this study to design EHEAs, resulting in a series of EHEAs with nano-structured precipitated phases. Some of the designed alloys exhibited excellent compressive mechanical properties.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
Yushi Zhang, Nianshuang Qiu, Zhuang Shen, Chang Liu, Xiaowei Zuo
Summary: Based on thermodynamics, this paper studied the microstructure, hardness, and compressive properties of high-entropy alloys (HEAs) with added niobium (Nb) during high-temperature aging. It was found that the Nb-rich precipitates and concentration of Nb within the matrix increased with the addition of Nb, resulting in enhanced hardness and yield strength. The high thermal stability of the HEAs was attributed to the synergistic effect of high-density secondary Cu-rich precipitates and low-energy Nb-rich precipitate/transition precipitate/matrix and Cu-rich precipitate/matrix interfaces.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Xiong Gao, Meiling Wang, Tingguang Liu, Yonghao Lu, Ahsan Ejaz
Summary: Thermo-mechanical treatment can significantly increase the proportion of low-sigma CSL grain boundaries in TP347H stainless steel, thus suppressing intergranular corrosion.
MATERIALS SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Q. Li, J. W. Mo, S. H. Ma, F. H. Duan, Y. L. Zhao, S. F. Liu, W. H. Liu, S. J. Zhao, C. T. Liu, P. K. Liaw, T. Yang
Summary: In this study, it was found that the long-standing problem of hydrogen embrittlement (HE) in metallic materials can be effectively eliminated in Fex(CrCoNi)1-x face-centered cubic (fcc) high-entropy alloys (HEAs) by triggering localized segregation of Cr at grain boundaries (GBs). Increasing the Fe concentration significantly improves the HE resistance, reduces ductility loss, and transforms the fracture mode. The increased Fe concentration promotes nanoscale Cr segregation at GBs, enhancing the GBs' cohesive strength and suppressing local hydrogen segregation, thus achieving outstanding HE resistance.
Article
Chemistry, Physical
Xiaoya Zhou, Xiangke Lv, Xiaoqian Bao, Jiheng Li, Xuexu Gao
Summary: The study found that Tb diffusion significantly affected the magnetic and mechanical properties of commercial N52 Nd-Fe-B magnets, with the anisotropy of Tb diffusion in the magnet being the main cause of differences in magnetic and mechanical properties.
Article
Nanoscience & Nanotechnology
Y. Xing, C. J. Li, K. X. Xiao, P. Gao, J. Tan, J. P. Wei, N. Y. Li, J. H. Yi
Summary: Equiatomic CrMnFeCoNi high-entropy alloys (HEAs) with multiphase structure were fabricated by vacuum hot-pressing sintering using mechanical alloying (MA) or spray-drying (SD) precursor powders. The bulk HEAs fabricated from MA powders exhibited excellent mechanical properties, attributed to the strengthening effect of precipitated nanoscale sigma phase and M23C6 phase.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Hiroyuki Watanabe, Toru Murata, Shunsuke Nakamura, Naoko Ikeo, Toshiji Mukai, Koichi Tsuchiya
Summary: Cold-working was found to facilitate the formation of sigma phase in CrMnFeCoNi alloy under specific heat treatment conditions. The resulting sigma-body-centered cubic (BCC) aggregates consist of sigma phase spines and BCC particles, forming rapidly at the face-centered cubic/sigma interface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Chemistry, Physical
Yu-Qing Zhang, Guo-Zheng Quan, Jiang Zhao, Yan-Ze Yu, Wei Xiong
Summary: Grain boundary engineering (GBE) is an attractive approach to enhance the grain-boundary-related properties of FCC metals. This review comprehensively discusses the theory, microscopic mechanisms, and optimization objectives of controlling the grain boundary character distribution (GBCD) during twinning-related GBE of FCC materials. The influence of initial microstructure, thermo-mechanical processing routes, and thermal deformation parameters on the twinning-related microstructures and associated evolution mechanisms are thoroughly discussed, with a focus on twinning-related kinetics models for predicting the evolution of twin density. The applications of twinning-related GBE in improving the mechanical properties and corrosion resistance of FCC materials are addressed, along with future prospects for controlling GBCD.
Article
Materials Science, Multidisciplinary
Youyou Zhang, Huibin Wu, Xinpan Yu, Jinxu Liu, Di Tang
Summary: Thermomechanical processing was used to optimize the grain boundary character distribution (GBCD) of a grain boundary engineered microstructure in a high-entropy alloy. The influence of annealing time and degree of tensile deformation on GBCD was investigated. The results show that a specific combination of tensile deformation and annealing time leads to the formation of desired GBCD. The degree of deformation has a significant impact on GBCD, where sufficient strain-induced boundary migration is more important than significant recrystallization.
MATERIALS CHARACTERIZATION
(2022)
Article
Chemistry, Physical
Xia Zhao, Min Wang, Xian-Chao Hao, Xiang-dong Zha, Ming Gao, Ying-Che Ma, Kui Liu
Summary: M23C6 carbides with a dendritic morphology were discovered for the first time in continuously cooled Alloy 690, mainly due to interfacial destabilization. The size of carbides, relative supersaturation, and constitutional undercooling are key factors influencing the formation of dendritic morphology. Additionally, the formation of dendritic morphology is sensitive to cooling rate and cannot occur at a rate lower than 2 degrees C/min.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Ruixuan Li, Baixue Bian, Gerhard Wilde, Yong Zhang, Sergiy V. Divinski
Summary: The tracer self-diffusion of Co in a compositionally complex AlCoCrFeNiTi0.2 alloy was measured using the radiotracer technique. The analysis of the complex multi-phase microstructure allowed for the determination of volume diffusion coefficients and grain boundary diffusion coefficients.
Article
Materials Science, Multidisciplinary
Risheng Pei, Yongchun Zou, Muhammad Zubair, Daqing Wei, Talal Al-Samman
Summary: This study investigates the synergistic effect of various alloying elements on the texture and microstructure evolution in magnesium alloys. The results demonstrate that adjusting the precipitation and solute segregation can lead to desired texture modifications.
Article
Materials Science, Multidisciplinary
Zewen Yu, Yaojun Lin
Summary: The research team developed fine-grained and ultra-fine-grained face-centered cubic (FCC) high-entropy alloys (HEAs) with precipitates, including C15 Laves phase and D0(19)-structured Ni3Nb precipitates, through cold rolling, annealing, and aging. The resulting alloy exhibited high strength and good ductility.
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)