Article
Chemistry, Physical
Wanwu Ding, Lumin Gou, Liwen Hu, Haixia Zhang, Wenjun Zhao, Jinyuan Ma, Jisen Qiao, Xiaochun Li
Summary: This paper investigates the effects of a novel Al-3Ti-4.35La master alloy on the morphology of eutectic Si and mechanical properties of hypoeutectic Al-7Si alloy, and reveals its modification mechanism. The results show that the addition of Al-3Ti-4.35La master alloy can transform the eutectic Si phase into a fine fiber and partial granular structure, significantly enhancing the ultimate tensile strength and elongation of the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Yinling Jin, Hongze Fang, Shu Wang, Ruirun Chen, Yanqing Su, Jingjie Guo
Summary: The addition of Eu can modify the eutectic Mg2Si phase, improving the mechanical properties of near-eutectic Al-Mg2Si alloys. Tensile properties are significantly enhanced when the Eu content is 0.05%, but they decrease with further increasing Eu content, indicating an over-modification effect.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Feipeng Yang, Jianying Wang, Tao Wen, Xinhai Ai, Xixi Dong, Hailin Yang, Shouxun Ji
Summary: The traditional wrought Al-Mg-Si alloys fabricated via laser powder bed fusion (LPBF) are prone to hot cracks, unless adding grain refiners in as-LPBFed Al alloys. In this work, the Al-9.6 wt.% Mg-4.9 wt.% Si alloy with low solidification range and hot-cracking susceptibility was successfully processed by LPBF. The as-LPBFed alloys have reached a high relative density of 99.3% at the VED of 129.6 J/mm(3). The microstructures were featured by fine a-Al grains and cellular eutectic Mg2Si, accompanied by a high number density of dislocations, coherent GP zone and alpha-Al-12(Fe, Mn)(3) Si phases. The as-LPBFed Al-13.3Mg(2)Si alloy exhibited the high ultimate tensile strength of 557 MPa, yield strength of 439 MPa and elongation of 2.9%. In addition to the grain refinement and dislocation strengthening, the strength enhancement is mainly ascribed to the dispersion strengthening from the divorced nanosized eutectic Mg2Si. The results demonstrate that manipulation of alloys at near eutectic composition is effective to achieve high strength Al-Mg-Si alloys processed by LPBF.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Lili Zhang, Zong-wei Ji, Jiuzhou Zhao, Jie He, Hongxiang Jiang
Summary: This study investigated the factors affecting eutectic Si modification in Al-Si hypoeutectic alloy with the addition of Na, Sr, Eu and Yb, and found that the modification effect is determined by element concentration in eutectic Si, solubility of modifying element M in alpha-Al, and interaction energy parameter of Al (or Si) and modifying element. A good modification is achieved by M of limited solubility in alpha-Al and a moderate interaction energy parameter of Si (or Al) and M. The results were verified by previous experimental results, and the effect of cooling rate on modification was also discussed.
Article
Materials Science, Multidisciplinary
Peng Tang, Shengcheng Lu, Hanbing Chen, Fan Mo, Jiadong Li
Summary: The addition of Ce element can enhance the mechanical properties and electrical conductivity of Al-5Ni alloy, by reducing the recalescence and growth temperatures of the Al-Ni eutectic structure and obtaining a spherical structure. However, excessive addition of Ce may result in lower strength and thermal conductivity.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Applied
Kang Wang, Shaodong Hu, Yanglin Zhong, Shuoxun Jin, Zirong Zhou, Zhiyu Wang, Jiongcai Chen, Bingbing Wan, Wenfang Li
Summary: This study systematically investigated the effects of ytterbium on the microstructure, electrical/thermal conductivity, and mechanical properties of Al-5Ni alloy. The experimental results showed that the addition of ytterbium could simultaneously improve the yield strength, ultimate tensile strength, and electrical/thermal conductivity. Ytterbium formed Al3Yb phase, which helped decrease the solubility of impurity elements in the alpha-Al matrix.
JOURNAL OF RARE EARTHS
(2022)
Article
Chemistry, Multidisciplinary
Hong-Chen Yu, Yu-Zhuo Men, Shu-Guo Yang, Hui Liu, Lei Yu, Xue-Dong Xu, Yi-Fei Li, Chang-Sheng Zou, Hao-Nan Wang, Wei-Rong Zhong
Summary: The study investigated the combined influence of Mg/Si and Ca contents on the crystallization of primary Mg2Si in Al-Mg2Si alloy. By restricting the embryo formation and growth of primary Mg2Si, the researchers successfully prepared dice-like primary Mg2Si in an over-modified alloy, revealing a novel method to control the morphology and particle size of primary Mg2Si and further understand the crystallization process.
Article
Chemistry, Physical
Qirong Wei, Hongxuan Wang, Jiabin Li, Xiang Quan, Weipo Li, Bin Wang
Summary: This study systematically investigated the microstructure, heat resistance, and creep resistance of Al-11Ce-xSi (x = 0, 0.9, 1.7 wt%) alloys. The addition of Si resulted in the formation of a tetragonal AlCeSi intermetallic compound. The Al11Ce3/α-Al eutectics transformed into rod-like structure and were gradually replaced by broad flaky AlCeSi/α-Al eutectics as the Si content increased. The Al-11Ce alloy containing 0.9 wt% Si exhibited the optimal tensile properties and excellent coarsening resistance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Chunjuan Cui, Yan Wang, Kai Zhang, Chongyang Wu, Wei Liu, Li Deng, Cong Wang, Haijun Su
Summary: The solidification rate has a significant effect on the microstructure and properties of Fe-Al-Ta eutectic composites. The microhardness increases with the solidification rate, while the fracture toughness shows an increase followed by a decrease trend. The toughening mechanism includes fine grain strengthening, crack deflection, and interface enhancement.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Tiffany Wu, Alex Plotkowski, Amit Shyam, David C. Dunand
Summary: A hypoeutectic, Fe-modified Al-Ce-Ni alloy was studied for its microstructure, thermal stability, ambient temperature strengthening, and creep resistance. The as-cast microstructure consisted of primary Al dendrites and interdendritic eutectic regions, with varying spacing depending on the ingot location. The alloy exhibited good thermal stability and resistance to coarsening after aging at 400°C for 6 weeks. Orowan strengthening and load transfer were identified as the strengthening mechanisms at ambient and elevated temperature.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Shuanqiang Wang, Guanghui Meng, Menghua Song
Summary: The effect of copper content on the microstructure and properties of an aluminum copper alloy containing lanthanum was studied. Adding La and Cu can refine the alloy grain and change the fracture mode. Excessive addition of Cu increases the tendency for hot cracking. The tensile strength and hardness of the cast alloy significantly increase with the increase in Cu addition. Adding Cu is beneficial for improving the wear resistance of the alloy. The best wear resistance and minimum wear amount occur when Cu addition is 3 wt%. The Cu content in the alloy can be increased to 7-8% with the increasing of additional rare-earth elements.
Article
Metallurgy & Metallurgical Engineering
Yusuf Kaygisiz, Cetin Palta, Tuba Cifci Kaymaz, Sevda Engin
Summary: The study investigated the effects of adding different rates of Mn to the Al-Si-Mg eutectic alloy and heat-treating the alloy. It was found that Mn addition increased the hardness and tensile strength of the alloy, and also increased the electrical resistance.
INTERNATIONAL JOURNAL OF METALCASTING
(2023)
Article
Materials Science, Multidisciplinary
Yong Guk Son, Sung Soo Jung, Yong Ho Park, Young Cheol Lee
Summary: This study investigated the microstructural changes and mechanical properties of high-strength aluminum alloy chips prepared in the semi-solid state under different processing parameters. It was found that the holding time significantly influenced the density and compressive strength of the chips, with a significant decrease in strength observed after 30 minutes of holding time. The deformation of the Mg2Si phase caused by aluminum diffusion was identified as a key factor for the decrease in mechanical properties of samples fabricated with a 30-minute holding time.
Article
Chemistry, Physical
Cleiton Luiz Pereira, Leonardo Fernandes Gomes, Amauri Garcia, Jose Eduardo Spinelli
Summary: This study investigates the effects of adding bismuth and antimony to hypereutectic Al-Si alloys through experiments and various analytical methods. The results show that antimony enhances wear resistance and Si growth form, while bismuth improves tensile properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Byungjoo Kim, Jihoon Hwang, Yongho Park, Youngcheol Lee
Summary: This study found that adding TiB2 particles can effectively modify the eutectic Al + Mg2Si phases in aluminum alloys, and proposed a new mechanism for TiB2 particles to promote Mg2Si phase modification.
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)