Article
Materials Science, Multidisciplinary
Hao Wang, Guoliang Qin, Changan Li
Summary: In this study, the flow stress data of 2219-O aluminum alloy were obtained through hot compression tests, and four different constitutive models were established and evaluated for their prediction accuracy. A newly modified constitutive model was proposed, which had a simpler structure and accurately predicted the evolution behavior of flow stress.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Ying Zhang, Jufu Jiang, Ying Wang, Yingze Liu, Minjie Huang
Summary: This work investigated the effects of temperature, strain rate, strain and initial orientation on the hot-compression behavior and microstructural evolution of hot-extruded 6A02 aluminum alloy. The results showed that higher temperature and lower strain rate led to lower geometrically necessary dislocation density, lower stored strain energy, and higher dynamic recrystallization degree. The continuous dynamic recrystallization mechanism was superior to the discontinuous dynamic recrystallization mechanism.
MATERIALS CHARACTERIZATION
(2022)
Article
Mathematics
Umer Masood Chaudry, Russlan Jaafreh, Abdul Malik, Tea-Sung Jun, Kotiba Hamad, Tamer Abuhmed
Summary: In this study, isothermal compression tests were conducted on highly ductile AZ31-0.5Ca Mg alloys at different conditions, and a strain-dependent constitutive model was constructed based on the Arrhenius equation and machine learning. The results demonstrated that the machine learning model outperformed the traditional model.
Article
Metallurgy & Metallurgical Engineering
Fu-rong Cao, Bin Yin, Si-yuan Liu, Lu Shi, Shun-cheng Wang, Jing-lin Wen
Summary: The hot compression behavior and microstructural evolution of fine-grained Al-Mg-Sc-Er alloy wires were investigated, showing that dynamic recovery is the dominant softening mechanism. Continuous dynamic recrystallization and dynamic grain growth were observed at specific temperature and strain rate conditions. The stress exponent and activation energy for deformation suggest that dislocation viscous glide is the main deformation mechanism.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2021)
Article
Chemistry, Physical
Tiantian Chen, Ming Wen, Hao Cui, Junmei Guo, Chuanjun Wang
Summary: In this study, the hot deformation behavior of pure copper was investigated through isothermal compression tests. Metallographic observation and microhardness measurement were conducted on the hot compressed specimens. The constitutive equation was established based on the strain-compensated Arrhenius model and the hot-processing maps were obtained. The effect of deformation temperature and strain rate on the microstructure characteristics was also studied. The results show that the flow stress of pure copper has positive strain rate sensitivity and negative temperature correlation. The suitable deforming process parameters for pure copper were determined.
Article
Nanoscience & Nanotechnology
Christopher Brown, Thomas McCarthy, Kanwal Chadha, Samuel Rodrigues, Clodualdo Aranas, Gobinda C. Saha
Summary: The study investigates the plastic flow behavior of high-entropy alloys under hot compression conditions and evaluates the suitability of various constitutive models, with some models showing reasonable accuracy in predicting the deformation behavior of the alloy. Microstructural analysis confirms the occurrence of discontinuous dynamic recrystallization during deformation at lower strain rates.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Mingjie Zhao, Liang Huang, Changmin Li, Jianjun Li, Pengchuan Li
Summary: The flow behaviors of 300M steel were studied through hot compression experiments, and a modified constitutive model was established to accurately quantify the flow behaviors. The microstructure evolution mechanism was analyzed and the deformation parameters were optimized to improve the microstructure of the alloy. The power dissipation efficiency was identified as a key index to evaluate the DRX degree and flow instability of 300M steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Liu Yang, Yong-Chuan Duan, Ying-Ping Guan, Zhen-Hua Wang
Summary: The hot deformation behavior of the annealed ZK61M magnesium alloy sheet was studied through tensile tests, indicating that the flow stress increased with lower deformation temperature and higher strain rate, with dynamic recrystallization occurring at temperatures higher than 423 K. The results show good agreement between the predicted peak stress from the constitutive model and the experimental values.
Article
Chemistry, Physical
Furong Cao, Chaofeng Sun, Siyuan Liu, Jinrui Liang, Renjie Liu, Huizhen Guo, Nanpan Guo
Summary: A new Mg-2.76Li-3Al-2.6Zn-0.39Y alloy was successfully fabricated and exhibited maximum elongation to failure at 633K and 1.67 x 10(-4) s(-1) strain rate, with a predominant deformation mechanism of dislocation glide creep controlled by lattice diffusion. Flow stress curves and microstructural examination revealed continuous dynamic recrystallization in most cases, but flow hardening phenomena at specific temperatures and strain rates.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Xiao-Min Chen, Y. C. Lin, Hong-Wei Hu, Shun-Cun Luo, Xiao-Jie Zhou, Yi Huang
Summary: The study investigates the hot deformation behavior of A356 aluminum alloy through isothermal compression experiments, identifying differences in stress responses and microstructural features under various deformation conditions. A new enhanced Johnson-Cook model is proposed to accurately describe the experimental results.
ADVANCED ENGINEERING MATERIALS
(2021)
Article
Engineering, Mechanical
Jinchuan Long, Qinxiang Xia, Gangfeng Xiao, Yi Qin, Shuai Yuan
Summary: This study characterized the flow characteristics and workability of as-extruded magnesium alloy ZK61 through isothermal compression tests. Flow stress curves were analyzed, and both conventional and improved Arrhenius constitutive equations were developed to predict flow characteristics. Activation energy maps identified dominant deformation mechanisms and optimal processing conditions for the alloy.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Dong Sun, Yanqiu Zhang, Shuyong Jiang, Junbo Yu, Bingyao Yan
Summary: The Ti-37 at pct Nb alloy has been successfully applied to engineering fields due to its excellent superconductivity and ductility. A processing map based on dynamic material modeling via stress-strain curves has been constructed to optimize hot processing parameters for the TiNb alloy. The study shows that the alloy has two appropriate working domains, with high deformation temperature contributing to the formation of fiber textures, but dynamic recovery and incomplete recrystallization are ineffective at high strain rates.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Daoguang He, Shibing Chen, Yongcheng Lin, Xintao Yan, Guan Liu
Summary: Isothermal deformation experiments were conducted on Hastelloy C276 alloy to analyze its microstructural evolution mechanisms. The study revealed that the hot compression parameters had a significant impact on the alloy's microstructure variation features and flow behaviors. The strain rates influenced the strain hardening effects, while the compressed temperature affected the true stresses through the annihilation of substructures and dynamic recrystallization behaviors.
Article
Chemistry, Physical
Yuehua Sun, Bin Yang, Fan Zhang, Richu Wang, Chaoqun Peng, Jian Ren, Guangsheng Song
Summary: The hot deformation behavior of the Mg-5Li-3Al-2Zn-0.2Zr alloy was investigated through hot compression tests. The true stress-strain curves showed dynamic recrystallization. The proposed strain-compensated Zener-Hollomon model accurately predicted the flow stress, and the average activation energy of the alloy was calculated. The microstructure evolution revealed different types of dynamic recrystallization at different temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Zhecheng Zhou, Qi Wang, Ruirun Chen, Xu Wang, DeZhi Chen, Hengzhi Fu
Summary: The variations in flow stress at elevated temperature for Nb-20Ti-16Si-0.5Gd alloy were studied through thermal simulation experiment. The results showed that the flow stress decreased with increasing deformation temperature, but increased with increasing strain rate. The constitutive equation of the alloy was derived using the Arrhenius hyperbolic sine function, accurately fitting the relationship between strain rate, stress, and temperature.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
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)