Article
Green & Sustainable Science & Technology
L. Deconinck, T. Depover, K. Verbeken
Summary: The present study experimentally investigates the uptake of hydrogen and the formation of hydrides in duplex Ti-6Al-4V. Hydrogen is introduced through electrochemical charging at room temperature. The effects of charging duration and current density are evaluated, revealing lattice strains and the formation of titanium hydrides under severe charging conditions. The charging conditions significantly influence the hydrogen distribution and hydride formation in the material. Controlling the electrochemical hydrogen charging conditions provides a better understanding of hydrogen-induced failure mechanisms and offers opportunities for sustainable thermohydrogen processing of titanium.
MATERIALS TODAY SUSTAINABILITY
(2023)
Article
Chemistry, Physical
Xiaofeng Xu, Xudong Yan, Yu Qian, Xueying Chong, Yachong Zhou, Yuguang Zhao, Xuehui Yang, Gaofeng Liu, Chao Wu
Summary: In this study, a high-strength and properly ductile Ti-6Al-4V alloy was successfully prepared using an innovative strategy based on electropulsing. The unique microstructure evolution resulting from electropulsing led to efficient alpha' lath refinement, which greatly enhanced the strength of the alloy. This novel bi-lamellar microstructure also contributed to the proper ductility of the alloy. These results and analysis offer a new approach to improving and controlling the mechanical properties of Titanium alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Yachong Zhou, Xiaofeng Xu, Yang Zhao, Xudong Yan, Lai Wei, Zhicheng Wu, Yongqiang Yu
Summary: Fine grain strengthening is crucial for improving mechanical properties in titanium alloys. In this study, electroshock treatment was found to directly recrystallize coarse prior beta grains in alpha+beta titanium alloy, leading to enhanced tensile strength and elongation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
J. R. Kennedy, A. E. Davis, A. E. Caballero, N. Byres, S. Williams, E. J. Pickering, P. B. Prangnell
Summary: Adding low levels of yttrium (Y) can reduce the width of solidified columnar beta grains in large titanium parts and induce a columnar-to-equiaxed transition (CET) in the latter stages of melt pool solidification, leading to reduced texture and increased solidification velocity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
V. N. Vilane, R. D. Knutsen, J. E. Westraadt
Summary: Temporary hydrogen alloying treatment can modify the coarse-grained microstructure of a titanium alloy, resulting in improved strength and ductility. The ductility of the alloy is affected by the dehydrogenation temperature, with excessive temperature leading to embrittlement. Controlling the dehydrogenation treatment can optimize the performance of the alloy.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Manufacturing
Xiang Wang, Lin-Jie Zhang, Jie Ning, Sen Li, Liang-Liang Zhang, Jian Long
Summary: The study introduces a method to refine the microstructure of Ti-6Al-4V alloys made by additive manufacturing, demonstrating that the addition of Y2O3 particles can effectively inhibit recrystallization and growth, leading to significant improvement in tensile strength without sacrificing elongation.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
Geonhyeong Kim, Taekyung Lee, Seyed Amir Arsalan Shams, Jae Nam Kim, Seong Woo Choi, Jae Keun Hong, Chong Soo Lee
Summary: This study developed a heterogeneous-structured (HS) Ti-6Al-4V alloy composed of coarse and fine grains to enhance mechanical properties. The HS alloy had higher strength and better resistance to low-cycle fatigue compared to a commercial mill-annealed coarse-grained (CG) alloy, while also maintaining ductility. It offered an engineering advantage of low-cost mass production compared to an ultrafine-grained (UFG) counterpart. The enhanced mechanical properties of the HS alloy were attributed to the presence of an ultrafine-grained region and partial transformation of texture.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Lu Yang, Saranarayanan Ramachandran, Axieh Bagasol, Qiyu Guan, Weiguang Wang, David J. Browne, Denis Dowling, Wajira Mirihanage
Summary: Laser powder bed fusion (LPBF) technology enables the production of metallic components without conventional design and manufacturing constraints. By reconstructing the as-solidified microstructure across the LPBF build volume, the initial solidification microstructure of Ti-6Al-4V alloy can be revealed, providing insights into the early stages of solidification. This approach also has the potential to explore solidification microstructure and defect formation in titanium alloys during additive manufacturing.
SCRIPTA MATERIALIA
(2023)
Article
Engineering, Manufacturing
J. R. Kennedy, A. E. Davis, A. E. Caballero, S. Williams, E. J. Pickering, P. B. Prangnell
Summary: The study explores the use of TiN and ZrN as grain refining inoculants to reduce the size of beta grains and improve their morphology in Wire-Arc Additive Manufacturing (WAAM) of titanium components.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Multidisciplinary
A. E. Davis, J. Donoghue, J. R. Kennedy, N. Byres, P. B. Prangnell
Summary: In-situ cooling experiments were conducted on Ti64 samples for the first time, revealing the development of alpha colonies. Primary alpha laths play a crucial role in influencing subsequent colony growth and transformation process by nucleating secondary alpha laths through sympathetic autocatalysis.
Article
Materials Science, Multidisciplinary
Xinyu Yang, Richard A. Barrett, Noel M. Harrison, Sean B. Leen
Summary: A physically-based, mixed-phase structure-property model is developed for analyzing the microstructure-sensitivity of tensile stress-strain response in additively manufactured Ti-6Al-4V, considering the effects of solutes, grain size, phase volume fraction, and dislocation density. The model incorporates solid-state phase transformation and dislocation density evolution to simulate the effects of martensite dissolution and a -b transformation at high temperature, allowing for rapid process-structure-property prediction and optimization.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Matteo Villa, Jeffery W. Brooks, Richard Turner, Frederic Boitout, Robin Mark Ward
Summary: This study examined the microstructure evolution of Ti-6Al-4V titanium alloy during high energy density welding process through numerical simulations and experimental validations. The numerical predictions were shown to reasonably match with experimental results, validating various metallurgical features of the alloy.
Article
Chemistry, Physical
Yujian Wang, Junjie Li, Jianwei Li, Lei Zhang, Jiankai Ma, Zhijun Wang, Feng He, Jincheng Wang
Summary: Coarsening of the basketweave alpha + beta microstructure in Ti-6Al-4V during thermal cycling is driven by multiple dissolution and precipitation transformations instead of conventional Ostwald ripening. This study reveals that the vanishing of alpha plates continues during repeated thermal cycling through two mechanisms, which are related to the Gibbs-Thomson effect. The influence of cycling frequency and total duration on the coarsening transformation is also detected. Long cycling duration leads to severe coarsening, while the final coarsening of alpha plates is almost independent of the cycling frequency.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Multidisciplinary
Cheng Kui, Zhang MingBo, Song Hao, Liu XinWang, Fan ZiTian, Wang GuiLan, Zhang HaiOu
Summary: This study explores the use of synchronous microrolling (HDMR) to address the problems of coarse columnar grains, inhomogeneous microstructure, and anisotropic mechanical properties in Ti-6Al-4V manufactured by wire and arc additive manufacturing (WAAM) and hybrid additive manufacturing with plasma-arc deposition. HDMR significantly refines the grains and improves isotropy, leading to better tensile properties in titanium alloys.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2022)
Article
Materials Science, Multidisciplinary
A. E. Davis, J. R. Kennedy, D. Strong, D. Kovalchuk, S. Porter, P. B. Prangnell
Summary: The study focused on characterizing the more refined primary beta-grain solidification structures and textures in components built with the novel coaxial electron beam wire DED AM (CEWAM) process. It was found that the CEWAM process changes the melt conditions to promote beta-grain nucleation ahead of the solidification front, resulting in a highly refined, equiaxed beta-grain structure. However, a mixed grain structure was commonly observed in thicker sections, requiring refinement during beta-annealing to achieve an equivalent microstructure to that seen in a standard beta-forged component.
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)