Article
Materials Science, Multidisciplinary
Dian Li, Xing Zhang, Wenrui Zhao, H. Darlene Merrill, Noah T. Meyer, Stoichko Antonov, Yiliang Liao, Yufeng Zheng
Summary: The research investigates the hierarchical alpha microstructure in metastable beta Ti-5553 alloy, with findings showing that the presence of high-index {10 9 3}(beta) type deformation twins can assist in the formation of hierarchical alpha microstructure. Different treatments can achieve refined alpha microstructure or super-refined alpha microstructure in Ti-5553, while the pre-formed deformation twins in the beta matrix lead to the generation of hierarchical alpha microstructure. It is observed that alpha phase precipitates from the twin boundary and grows along it, resulting in alpha sub-layers and fine-scale alpha precipitates forming within the beta twin structure.
Article
Nanoscience & Nanotechnology
Sang Won Lee, Jae Hyeok Kim, Chan Hee Park, Jae-Keun Hong, Jong-Taek Yeom
Summary: A new alloy design of metastable alpha+beta-Ti alloy with a mix of high yield strength alpha phase and low elastic modulus metastable beta phase has been proposed in this study, achieving an excellent combination of strength and ductility with a high elastic admissible strain. Heat treatment in the alpha+beta regime is an effective method for grain refinement, resulting in high strength without increasing the elastic modulus.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Jing Wen, Eric Fleury, Fei Cao, Nathalie Allain
Summary: The relationship between hydrogen concentration and phase structure, as well as microstructure modification in the beta-metastable beta-21S titanium alloy, was revealed in this study. It was found that the microstructure and phase structure of the alloy are strongly dependent on hydrogen concentration. At lower hydrogen concentration, hydrogen atoms expanded the lattice and inhibited phase decomposition; while at higher hydrogen concentration, internal stresses induced the formation of α'' martensite and nano-sized ω phase in the microstructure.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Kathleen Chou, Nan Li, Emmanuelle A. Marquis
Summary: Oxygen partitioning to omega phase during aging improves compressive yield strength and work hardening behavior of titanium alloys containing oxygen-stabilized omega precipitates. Oxygen may offer design strategies to address embrittlement and loss of ductility in omega-strengthened beta Ti alloys.
Article
Metallurgy & Metallurgical Engineering
Wei Zhou, Chang Wang, Ji-xiong Liu, Si-yun LI, Hui-qun Liu
Summary: The ageing precipitation sequence and microstructure-tensile properties relationship of metastable beta titanium alloy Ti-6Cr-5Mo-5V- 4Al were studied during solution and ageing. Isothermal phase (omega(iso)) precipitation occurred at 400-450 degrees C, resulting in high hardening and brittle fracture. At 450-500 degrees C, omega(iso) phase was gradually replaced by secondary alpha phase (a(s)) with increasing ageing time. At higher ageing temperature (580-600 degrees C), omega(iso) precipitation was suppressed, and a(s) phase precipitated directly from beta phase. The yield strength and elongation of the samples aged at 450 degrees C for 12 h were 1368 MPa and 5.5%, respectively, due to omega(iso) precipitation. The yield strength and elongation of the samples aged at 600 degrees C for 12 h were improved to 1108 MPa and 15.4%, respectively, due to the precipitation and coarsening of a(s) phase.
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
(2023)
Article
Materials Science, Multidisciplinary
Ruixue Zhang, Yingjie Ma, Min Qi, Sensen Huang, Sabry S. Youssef, Guoqiang Xi, Jianke Qiu, Jiafeng Lei, Rui Yang, Ping Wang
Summary: The microstructure evolution and tensile properties in a metastable beta titanium alloy, Ti-5Al-5Mo-5V-3Cr-0.6Fe alloy, with different aging conditions were investigated. The results showed that the nanoscale omega phase formed during low-temperature aging had no effect on the tensile properties. Additionally, the small size omega phase failed to assist secondary alpha(s) nucleation and refine alpha(s) during high-temperature aging due to omega dissolution. On the other hand, the alpha phase precipitated during low-temperature aging played a considerable role in refining lamellar alpha(s) and increasing tensile strength.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Yuhe Huang, Everth Hernandez -Nava, Xiaogang Hu, Iain Todd, Qiang Zhu
Summary: This study reports an unusual martensitic strain accommodation mechanism in an electron beam processed metastable beta-Ti alloy. The research reveals a fine-grained microstructure with ultrafine laths of martensites embedded within the beta structure. The findings provide an alternative route for utilizing the martensitic strain accommodation mechanism, benefiting additive manufacturing beta-Ti alloy components with desired mechanical performance.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Lili Guo, Fang Yang, Boxin Lu, Chenzeng Zhang, Cunguang Chen, Zhimeng Guo
Summary: The effects of solution-aging treatment on the microstructure and mechanical properties of PM Ti-6554 titanium alloy were investigated. The alloy showed a good balance between strength and ductility after solution treatment at 810 degrees C/30 min with furnace cooling and aging treatment at 520 degrees C/6 h. Increasing the solution temperature from 810 degrees C to 850 degrees C resulted in increased ultimate tensile strength and yield strength, but reduced elongation. The microstructure analysis revealed that the grain size of the alpha phase increased with solution temperature, while the volume fraction showed an opposite trend. Slower cooling rate during solution treatment was beneficial for maintaining the strength-plasticity matching.
Article
Chemistry, Physical
S. Pilz, A. Hariharan, F. Guenther, M. Zimmermann, A. Gebert
Summary: This study reveals the influence of omega iso precipitates on the deformation mechanisms and mechanical properties of a biomedical beta-type Ti-40Nb alloy. The results show that the fraction and size of omega iso increased with increasing aging time, leading to an increase in Young's modulus and proof stress. The active deformation mechanisms also changed with aging time, resulting in significant alterations in mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Nanoscience & Nanotechnology
Stoichko Antonov, Rongpei Shi, Dian Li, Zachary Kloenne, Yufeng Zheng, Hamish L. Fraser, Dierk Raabe, Baptiste Gault
Summary: The presence of nano-scale, titanium-rich, ordered-orthorhombic O'' precipitates in a metastable beta-Ti alloy is found to assist alpha nucleation and growth. Aluminum partitions equally between the beta matrix and the growing alpha precipitates in the initial stages, but diffuses into the alpha phase during isothermal aging at 400 degrees C for 15 hours. The interplay between pre-formed metastable phases and alpha can be utilized to tailor the microstructure and improve the mechanical properties of beta-Ti alloys.
SCRIPTA MATERIALIA
(2021)
Article
Chemistry, Physical
J. F. Xiao, B. B. He, C. W. Tan
Summary: {332}(beta) twinning and stress-induced martensite transformation are two important deformation mechanisms in metastable beta titanium alloys. By studying a model alloy, the correlation between {332}(beta) twinning and stress-induced martensite was revealed. The mechanism leads to a strong relationship between {332} twinning and stress-induced martensite in the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Mariana C. M. Rodrigues, Thomas Garcin, Matthias Militzer
Summary: This study explores the potential of laser ultrasonics for metallurgy (LUMet) as an advanced in-situ technique to measure the alpha formation kinetics in a Ti-5553 alloy. Experimental observations and theoretical models based on the Johnson-Mehl-Avrami-Kolmogorov (JMAK) theory provide insights into transformation kinetics. The consistency between the partial time-temperature-transformation (TTT) diagram and in-situ measurements reaffirms the monitoring capacity of LUMet for microstructure evolution in Ti-alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Xiaoli Zhao, Yu Wang, Hao Xue, Nan Jia, Yang Liu, Deliang Zhang
Summary: Increasing strain rate in Ti-30Zr-5Mo alloy leads to stress-induced alpha ' phase transformation, resulting in ultra-high strain hardening rate and localized deformation, ultimately enhancing ultimate tensile strength.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Geosciences, Multidisciplinary
Takayuki Ishii, Eiji Ohtani
Summary: Research suggests that even under wet subducting slab conditions, olivine and wadsleyite exhibit dry transformation kinetics, which could contribute to deep-focus earthquakes and large slab deformation.
Article
Materials Science, Multidisciplinary
Tayyeb Ali, Lin Wang, Xingwang Cheng, Huanwu Cheng, Ying Yang, Anjin Liu, Xuefeng Xu, Zhe Zhou, Zixuan Ning, Ziqi Xu, Xinhua Min
Summary: The study investigates the deformation mechanisms and phase transformations of Ti-5553 alloy under quasi-static and dynamic compression loading. It is found that dislocation slip and twinning are the dominating deformation modes, with grain boundary sliding and spalling more pronounced in quasi-static compression. Stress-induced phase transformations, such as beta to alpha'' and beta to omega, were observed in grains saturated with dislocation slips.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
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)