Article
Materials Science, Coatings & Films
Yongming Zou, Zhaoguo Qiu, Chunjie Huang, Dechang Zeng, Rocco Lupoi, Nannan Zhang, Shuo Yin
Summary: In this study, high entropy alloy composite coatings were successfully fabricated using cold spray technique, showing higher hardness and improved wear-resistance properties compared to pure alloy coatings. The reinforcing effect of Al2O3 particles and the formation of a tribo-layer were the main reasons for the improvements in the composite coatings.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Hong Zhang, Rui Zhang, Xiaoyu Zhao, Xindong Li, Botong Chen, Yuhong Li, Peng Wang
Summary: The representative FCC structured NiCr(MoNb)x-Ag (x = 0, 0.65 and 1.05) composite films were developed and studied for their microstructure, mechanical, and tribological properties. It was found that small amounts of nm-sized Ag particles are dispersed in the thin film matrix. The NiCr(MoNb)1.05-Ag composite film showed the best tribological performance with low friction coefficients at high temperatures.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Zhongtang Gao, Bei Sun, Yuan Yu, Jinzhou Li, Tongyang Li, Lujie Wang, Zhiming Gao, Zhuhui Qiao
Summary: A CoCrFeNi-Ag-Mo self-lubricating composite was synthesized by spark plasma sintering, and the effects of Ag and Mo addition on the microstructure, mechanical and tribological properties of CoCrFeNi high entropy alloy (HEA) were systematically investigated. The addition of Ag led to the formation of Ag-rich phase within the CoCrFeNi HEA matrix, while the addition of Mo resulted in the distribution of Ag-rich phases inside the Mo-rich phase. The coupling addition of Ag and Mo effectively improved the tribological properties from room temperature to 800 degrees C.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Engineering, Mechanical
S. E. Mousavi, A. Q. He, M. Palimi, D. L. Chen, D. Y. Li
Summary: The individual influences of Al, Fe and Ni on the microstructure, wear resistance and mechanical properties of high-entropy alloys (AlxCrFeyNizTi0.2) were studied. It was found that increasing Al content led to the replacement of the FCC phase by disordered and ordered BCC phases, resulting in increased micro-hardness and decreased wear volume loss. Fe increased the fraction of A2 phase but reduced hardness and wear resistance. Ni helped form a FCC phase, which decreased hardness and increased wear volume loss. Among all specimens, AlCrFeNiTi0.2 and Al0.5CrNiTi0.2 showed the highest wear resistance.
Article
Engineering, Mechanical
Yushan Geng, Jiao Chen, Hui Tan, Jun Cheng, Shengyu Zhu, Jun Yang
Summary: The study presents the outstanding performance and mechanism of CoCrFeNiAl high-entropy alloy matrix solid-lubricating composites, showing the friction properties and wear mechanisms under different temperature conditions.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Optics
Keyao Li, Jun Liang, Jiansong Zhou
Summary: A self-lubricating wear-resistant CoCrFeNiMo composite high entropy alloy (HEA) coating was fabricated on 304L stainless steel using laser cladding technology. The addition of WS2 and Cr3C2 improved the tribological properties of the CoCrFeNiMo HEA. The composite coating exhibited good tribological performance due to the synergistic effect of multiple lubrication mechanisms.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yushan Geng, Jun Cheng, Hui Tan, Qichun Sun, Juanjuan Chen, Shengyu Zhu, Anh Kiet Tieu, Jun Yang, Weimin Liu
Summary: High-entropy alloy matrix solid-lubricating composites with coupled high-entropy phases as the matrix material show excellent anti-wear and friction-reduced properties. The synergistic Ag-BaF2/CaF2 lubricating films eliminate stress concentration and suppress abrasion and roughening. The high-entropy composite tribo-layers provide strong stress shielding and avoid oxidative and adhesive wear. Developing similar coupled high-entropy matrix phases can further optimize the tribological properties of the composites.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Applied
Jiaye Li, Beibei Chen, Zhe Dong, Bi Yang, Shu Qiu, Hao Zhang, Shuang Wang, Kan Zhang
Summary: In this study, hexagonal boron nitride nanosheets supported with silver nanoparticles were used to enhance the tribological performance of epoxy self-lubricating composite coatings. The results showed that the composite coating significantly improved lubricity and wear resistance, with the best performance achieved at a 0.7% weight fraction.
PROGRESS IN ORGANIC COATINGS
(2022)
Article
Metallurgy & Metallurgical Engineering
Wei-cheng Xiao, Kun Li, Liu-liu Han, Yong Liu
Summary: By incorporating BaF2/CaF2 eutectic powder, the friction coefficients and wear rates of EHEA composites at high temperatures can be significantly reduced, with the best lubricating performance observed at 600°C with 15% and 20% eutectic powder content.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Chemistry, Physical
Akshay D. Nakhate, Nikhil Kumar, Prince Sharma, Prabhat Chand Yadav
Summary: There has been a growing interest in high-entropy alloys (HEAs) due to their unique compositions and customizable properties. This study investigated the microstructure and deformation behavior of the CoCrFeMnNi HEA under different rolling conditions. The results showed that multi-step cross-rolling can effectively enhance the strength and ductility of HEAs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jinquan Guo, Chaozhongzheng Tang, Huan Sheng Lai
Summary: High-entropy alloys have great potential for application in nuclear power plants due to their excellent mechanical properties and resistance to radiation. In this study, the microstructure and mechanical properties of the Co32Cr28Ni32.Al-94 (4). Ti-06 (3) high-entropy alloy were investigated, revealing a single-phase, disordered, face-centered cubic solid-solution structure with satisfactory yield stress and tensile strength.
Article
Materials Science, Coatings & Films
Junjun Wang, Xinyu Liu, Yan Zhang, Wumin Cai, Linqing Wang, Liwen Tang
Summary: ZrNbTiMo refractory high entropy alloy films were deposited using direct current magnetron sputtering with different substrate biases. The films exhibited a single body-centered-cubic structure and the preferred orientation changed with increasing substrate bias. The surface roughness initially decreased, then increased. The hardness of the films increased while the wear resistance did not have a consistent trend with the increase of substrate bias. The wear mechanism of the films was investigated from the perspective of microstructure.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Physical
Qinglin Li, Shuyue Lv, Xiaowu Hu, Yefeng Lan, JunZhao Liu
Summary: The microstructure evolution and tribological properties of Al0.25CrFeNi1.75Nbx (x = 0, 0.3, 0.6, 0.66, 0.69, 0.72, and 0.75) high entropy alloys were investigated. The addition of Nb effectively improved the hardness and wear resistance of the alloy.
Article
Engineering, Mechanical
Cuong Nguyen, Anh Kiet Tieu, Guanyu Deng, David Wexler, Tri Dinh Vo, Long Wang, Jun Yang
Summary: A cost-effective self-lubricating composite material based on CrFeNiAl0.3Ti0.3 as the matrix and Ag as the solid lubricant has been fabricated. Tribological tests show that the presence of Ag tribo-film reduces the coefficient of friction and wear of the composites from room temperature to 600 degrees C. The wear mechanism changes from abrasive to oxidative wear at 750 degrees C.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
Jianxin Dong, Hongxing Wu, Ying Chen, Yongliang Zhang, Yunjie Wu, Shaochong Yin, Yin Du, Ke Hua, Haifeng Wang
Summary: Electrochemical boronizing was applied to improve the surface hardness and self-lubrication performance of AlCoCrFeNi2.1 HEA in this study. The results showed that electrochemical boronizing could efficiently form a boronized layer and reduce friction and wear.
SURFACE & COATINGS TECHNOLOGY
(2022)
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)