Article
Materials Science, Multidisciplinary
H. Mohammadi, A. R. Eivani, S. H. Seyedein, M. Ghosh, H. R. Jafarian
Summary: Isothermal compression tests were conducted on Zn-22Al alloy under different temperature and strain rate conditions. The results showed that all flow stress curves exhibited softening behavior after reaching peak stress due to dynamic recrystallization and dynamic recovery. Various parameters relating to deformation conditions were determined. A kinetic model for dynamic recrystallization was constructed and validated. The simulation results using DEFORM-3D finite element software confirmed the non-uniform distribution of effective strain and dynamic recrystallization, consistent with the experimental results.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Zhenglong Liang, Liqun Niu, Hao Li, Qi Zhang, Ke Huang
Summary: The impacts of loading conditions on the mechanical response and DRX of A356 during single and double thermal compression were investigated. The results show that the strain hardening rate during the second isothermal compression is much higher than that during the initial isothermal compression. The microstructure analysis reveals that both single and double compression result in a microstructure dominated by deformed columnar grains and equiaxed recrystallized grains. Additionally, the recrystallization fraction of the samples after double compression is greatly influenced by their initial dislocation density and microstructure state.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Materials Science, Multidisciplinary
Meng-Na Zhang, Hai-Long Jia, Min Zha, Lei Zhao, Zhen-Ming Hua, Cheng Wang, Yi-Peng Gao, Hui-Yuan Wang
Summary: Tailoring recrystallization in low-alloyed rare earth-free Mg alloys is still challenging. In this study, the texture of a dilute cold-rolled Mg-2.2Al-0.33Ca (wt.%) alloy is found to weaken with the appearance of transverse direction (TD) texture components during static recrystallization. The texture transition is attributed to the preferential growth of TD-oriented recrystallized grains due to the preferential segregation of Al and Ca atoms on basal-oriented grain boundaries with low misorientation angles. These findings provide an in-depth understanding of texture modification in Mg alloys.
MATERIALS RESEARCH LETTERS
(2023)
Article
Metallurgy & Metallurgical Engineering
Wei Liu, Yu Su, Yuntao Zhang, Liwen Chen, Hua Hou, Yuhong Zhao
Summary: This study investigates the variation in LPSO structures, dynamic recrystallization, and mechanical performance of Mg89Y4Zn2Li5 alloys fabricated at different extrusion speeds and die angles. It is found that the block 18R LPSO structures elongate while the lamellar 14H LPSO structures dissolve. The hot-extruded alloys exhibit a full DRX microstructure, and the DRX grain size decreases with decreasing extrusion speed and die angle. The Mg89Y4Zn2Li5 alloy achieves an excellent strength-ductility balance at a low extrusion speed and small die angle.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Chemistry, Physical
Yu-Ying He, Gang Fang
Summary: In this study, the dynamic precipitation (DP) of Mg17Al12 phase during the deformation of an Mg-Al-Zn-RE alloy was investigated. The effects of temperature and strain rate on the volume fraction, number density, and average size of Mg17Al12 precipitates were studied. Phenomenological models linking the precipitation parameters with deformation conditions were established and validated. The pinning effect of DP on grain growth and the influence of temperature on DRXed grain size were also discussed. The results provide insights into the understanding of microstructural evolution in the Mg-Al-Zn-RE alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Jiao Luo, Kengfeng Xu, Chaojun Li, Miaoquan Li, Yingying Lin
Summary: Isothermal compression tests, EBSD observations, and quantitative analysis were conducted to investigate the effect of process parameters on microstructure variables during isothermal compression of NiTi shape memory alloy. The results showed that dynamic recovery is the dominant softening mechanism at lower strains, while dynamic recrystallization plays a significant role in softening the alloy at higher strains, leading to a steady state of flow behavior. Additionally, the occurrence of dynamic recrystallization during deformation promotes the formation of a strong gamma-fiber texture in the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Metallurgy & Metallurgical Engineering
Yiping Wu, Yuzhen Jia, Sha Zhang, Yu Liu, Hanqing Xiong, Gang Chen
Summary: This study investigated the flow softening behavior of a homogenized Mg-7Gd-4Y-1Nd-0.5Zr alloy under compression at high temperatures and a constant strain rate. The results provide insights into the softening mechanisms and formation of fine grains at different temperatures.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Materials Science, Multidisciplinary
Hong Xu, Yupeng Wang, Zhipeng Guo, Ming Bai, Pinkui Ma, Guiying Wang, Xiuming Cheng
Summary: Electrical pulse treatment and isothermal heat treatment were used to modify the microstructure of hot-rolled AZ61 alloy. The impact of pulsed current on crystal growth mechanism and precipitation phase diffusion was investigated. The findings showed that electrical pulses enhanced the recrystallization and dissolution of Mg17Al12 precipitate in the hot-rolled AZ61 alloy. The recrystallization fraction was higher in the electrical pulse treated samples compared to the isothermal heat treated counterparts. The amount of Mg17Al12 phase was significantly reduced with longer electrical pulse duration.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
M. Mohseni, A. R. Eivani, H. Vafaeenezhad, H. R. Jafarian, M. T. Salehi, J. Zhou
Summary: The study demonstrated that increasing annealing temperature and holding time in magnesium alloys can decrease the fraction of second-phase particles, thereby limiting grain growth and affecting grain size and homogeneity.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Dayu Shu, Jing Wang, Menghao Jiang, Gang Chen, Liwei Lu, Hongming Zhang
Summary: The DRX behavior of the as-extruded AM50 magnesium alloy was investigated using isothermal compression experiments and CA simulations, showing that the behavior is temperature and strain rate dependent. The developed CA model can confidently estimate the DRX behavior of the alloy under high temperature conditions.
Article
Chemistry, Physical
Hong Xu, Yu-Jie Zou, Yu Huang, Pin-Kui Ma, Zhi-Peng Guo, You Zhou, Yu-Peng Wang
Summary: Electric pulse can enhance plasticity of metals by facilitating room-temperature dynamic recrystallization for texture weakening, and subsequently improving plasticity. Our study found a strong dependence of peak flow stress and fracture strain on current density in a polycrystalline Mg-3Al-1Sn-1Zn alloy.
Article
Materials Science, Multidisciplinary
Salaheddine Sadi, Abdelkader Hanna, Thierry Baudin, Francois Brisset, Jose Maria Cabrera, Hiba Azzeddine
Summary: The static recrystallization and grain growth behaviors of Mg-0.3Ce alloy processed by ECAP and annealed were investigated. The microstructure and texture were found to be strongly influenced by the strain level, second particles distribution, and fraction of dynamic recrystallization during ECAP.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Umer Masood Chaudry, Yeonju Noh, Gukin Han, Russlan Jaafreh, Tea-Sung Jun, Kotiba Hamad
Summary: This study investigates the effects of CaO additions on the microstructure, texture, and mechanical properties of AZ61 magnesium alloy. The addition of CaO leads to the formation of Ca-rich intermetallic compounds and influences the evolution of the alloy's structure. Additionally, the alloys containing CaO exhibit twined structures, with an increased fraction of tension twins as the amount of CaO increases.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
Yu-Ying He, Sheng-Wen Bai, Gang Fang
Summary: In this study, the dynamic recrystallization (DRX) behavior of a Mg-Al-Zn-RE alloy with abundant second-phase particles during hot extrusion is investigated using a combination of finite element (FE) and cellular automaton (CA) models. The results show that the extrusion conditions have a significant influence on the microstructural evolution of the magnesium alloy.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Chemistry, Physical
Rui Han, Jie Zheng, Zhaoming Yan, Leichen Jia, Jingjing Jia, Liang Liu, Zhimin Zhang, Yong Xue
Summary: This study investigated the evolution of stress-strain curves, microstructure changes, and the behavior of the long-period stacking-ordered (LPSO) phase in a Mg-Gd-Y-Zn-Zr alloy under different thermal compression conditions. The results indicate that increasing deformation temperature and decreasing strain rate promote the occurrence of dynamic recrystallization.
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)