Article
Chemistry, Physical
Nana Chen, Hongchao Kou, Zhihong Wu, Fengming Qiang, Chuanyun Wang, Jinshan Li, J. M. Molina-Aldareguia
Summary: The Ti-7333 alloy deforms predominantly by stress-induced martensitic (SIM) and SIM alpha '' twinning, with the prevalence of {130}<310>(alpha '') compound twinning attributed to the comparatively small shear and simple shuffle mechanism. Different twinning modes are activated during deformation stages, leading to the development of a hierarchical microstructure responsible for the high work hardening displayed by the alloy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Aya Matsushita, Yoji Mine, Kazuki Takashima
Summary: The addition of nanotwin bundles in 304 metastable austenitic stainless steel enhances fatigue crack growth resistance by inhibiting brittle twin boundary separation and promoting detwinning and martensite formation during crack propagation.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
Yu Fu, Wenlong Xiao, Damon Kent, Jian Rong, Xinqing Zhao, Chaoli Ma
Summary: Natural aging was investigated in a TRIP Ti alloy, resulting in a significant increase in yield strength without sacrificing ductility. This was achieved through decreased particle size, leading to continuous stress-induced β-α' martensitic transformation over a wider range of strains, enhancing both strength and uniform elongation.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Abhishek Rastogi, Rajdeep Sarkar, Suresh Neelakantan
Summary: Martensitic transitions in Ti-1023 alloy as a function of cold rolling strain levels (5-43%) have been investigated. Different phases such as ω and α' have been confirmed from the β phase through XRD, TEM, and EBSD techniques. The presence of ω phase is confirmed in the 5% cold rolling sample, which acts as preferential nucleating sites for α' martensite formation. Additional deformation processes such as martensite compound twinning and strain-induced α'→α' martensitic transformation are also observed. With further increase in cold rolling strains to 43%, the transformation of β→α' and strain-induced α'→α' martensites are pronounced. The study suggests that Ti-1023 alloy exhibits high cold deformability up to -43%.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
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
Chemistry, Physical
Mansur Ahmed, Elena Pereloma
Summary: A metastable Ti-10V-3Fe-3Al alloy processed by powder metallurgy is thermo-mechanically processed to obtain a dual-phase (alpha and beta) microstructure. The deformation mechanisms of the compressed sample, including the formation of deformation twins and martensite, are thoroughly investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Bingnan Qian, Lola Lilensten, Jinyong Zhang, Min Yang, Fan Sun, Philippe Vermaut, Frederic Prima
Summary: The diverse pathways of deformation-induced transformations in the beta-metastable Ti-12Mo alloy displaying combined TWIP were investigated via two different ways.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Abhishek Rastogi, Suresh Neelakantan
Summary: In this study, stress-induced martensitic transformation (SIMT) has been effectively demonstrated to achieve a significant cold reduction of -43% and -45% in the metastable Ti-10V-2Fe-3Al and Ti-5Al-5V-5Mo-3Cr alloys, respectively. The presence of stress-induced alpha '' martensites provides preferential nucleation sites for new strain-free grains formation upon recrystallization annealing. Thermomechanical treatment results in a grain refinement of -93% and -80% for Ti-1023 and Ti-5553 alloys, respectively. The diffusivities of alloying elements, such as Fe, Mo, V, Cr, and Al, have been confirmed to alter the stability of the fl phase during recrystallization annealing, as evidenced by Electron Probe Micro Analyzer (EPMA). The effect of grain size on the SIMT ability based on microhardness variations has also been deduced.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Ravi Sankar Haridas, Priyanka Agrawal, Surekha Yadav, Priyanshi Agrawal, Anurag Gumaste, Rajiv S. Mishra
Summary: The excellent work hardening in TRIP-enabled metastable high entropy alloys is attributed to the phase transformation from austenite to martensite, as well as non-basal slip activity and deformation twinning. A five-parameter empirical model has been developed to replicate the work hardening rate in TRIP HEAs, with easy parameter identification compared to physically based models. The model parameters are correlated with stacking fault energy to predict the tensile stress-strain response of TRIP HEAs.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Shun Guo, Wang Ding, Huihui Zhang, Weiqun Lu, Guanglei Liu, Haixia Liu, Xiaonong Cheng, Xinqing Zhao
Summary: In this study, a Ti-Nb alloy with large near-linear recoverable strain was designed to investigate the physical mechanisms responsible for high near-linear elastic deformability. The experimental results showed that the high near-linear elastic deformability of this alloy is attributed to a combined effect of large inherent elastic deformation and a reversible SIMT.
MATERIALS CHARACTERIZATION
(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
Nanoscience & Nanotechnology
Feng Zhang, Jun Feng, Wei Xiang, Qiang Fu, Wuhua Yuan
Summary: In this study, it was found that slow heating during the aging process of the TB18 alloy can lead to finer intragranular alpha plates due to the abundance of omega/beta interfaces provided by omega iso particles. This provides heterogeneous nucleation sites for alpha precipitates and reduces the nucleation driving force. Appropriate omega-assisted nucleation can enhance the ductility of the TB18 alloy without reducing its strength, resulting in optimal comprehensive mechanical properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Xinkai Ma, Jiahao Li, Zhuo Chen, Junye Li, Xiaojun Zhao, Fuguo Li
Summary: In this study, the dynamic tensile deformation behavior and microstructural evolution of a metastable beta titanium alloy (Ti-10 V-2Fe-3Al, Ti-1023) with a single beta phase structure were investigated. The results showed that the dynamic tensile properties and work hardening ability of the alloy exhibited a significant strain rate dependence, and microstructural analyses revealed that the deformation mechanisms and phase transformations played important roles in the work hardening behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Bin Sun, Kuishan Sun, Xianglong Meng, Jun Wang
Summary: The twinning behavior of a Ti-26Nb alloy during thermal cycling was investigated using transmission electron microscopy. The study proposed the interrelationships between displacive transformation and twinning. The formation and growth of twins during the cycling process were observed, and the role of the interfacial twin boundary alpha phase in mediating the martensitic transformation was revealed.
SCRIPTA MATERIALIA
(2022)
Article
Nanoscience & Nanotechnology
Hyeonseok Kwon, Praveen Sathiyamoorthi, Gangaraju Manogna Karthik, Peyman Asghari-Rad, Alireza Zargaran, Hyeon-Seok Do, Byeong-Joo Lee, Hidemi Kato, Hyoung Seop Kim
Summary: This study presents a novel FeCoNiAlTiMo medium-entropy alloy with ultra-high tensile strengths at 298K and 77K. Through hot rolling without further heat treatment, a quasi-dual-phase microstructure with high density of dislocations and Mo-rich mu phase precipitates was created, leading to increased strain hardening ability.
SCRIPTA MATERIALIA
(2021)
Article
Materials Science, Multidisciplinary
Seong-Woo Choi, Jae Suk Jeong, Jong Woo Won, Jae Keun Hong, Yoon Suk Choi
Summary: Cryogenic-temperature rolling (CTR) significantly increases the yield strength of commercially pure titanium, demonstrating twinning-induced grain refinement and dislocation accumulation as the main mechanisms for strengthening. This method provides a way to achieve ultrahigh-strength CP titanium for structural applications requiring high-strength materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Seulbi Lee, Jaewoong Kim, Jungho Choe, Seong-Woong Kim, Jae-Keun Hong, Yoon Suk Choi
Summary: The crack formation mechanisms of Ti-48Al-2Cr-2Nb single tracks processed by laser powder bed fusion were investigated. Different crack patterns and formation mechanisms were observed under different laser processing conditions.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Cheng-Lin Li, Seong-Woo Choi, Jeong Mok Oh, Jae-Keun Hong, Jong-Taek Yeom, Joo-Hee Kang, Qing-Song Mei, Chan Hee Park
Summary: The influence of pre-strain on the bimodal grain structures and tensile properties of a Co-20Cr-15W-10Ni alloy was investigated. High pre-strain intensifies plasticity heterogeneity, while high-temperature annealing increases the size and volume fraction of coarse grains. Tensile properties strongly depend on the size ratio and volume fraction of fine grains/coarse grains in addition to the average grain size in the bimodal grain structures.
Article
Nanoscience & Nanotechnology
Geonhyeong Kim, Seyed Amir Arsalan Shams, Jae Nam Kim, Jong Woo Won, Seong Woo Choi, Jae Keun Hong, Chong Soo Lee
Summary: The low-cycle fatigue behavior of a cryogenic-rolled commercially pure titanium alloy was investigated, showing that increasing the volume fraction of deformation twins through pre-deformation significantly improved the low-cycle fatigue resistance. The formation of smaller dislocation cells in the pre-deformed microstructure led to more severe crack arrest.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
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
Cheng-Lin Li, Jeong Mok Oh, Seong-Woo Choi, Xin-Ming Mei, Jae-Keun Hong, Jong-Taek Yeom, Qing-Song Mei, Zhen-Tao Yu, Chan Hee Park
Summary: The present study demonstrates that the Co-20Cr-15W-10Ni alloy with a bimodal grain structure exhibits thermal stability and superior mechanical properties, including high strength and ductility, compared to the unimodal grain structured ones under high-temperature exposure treatments.
Article
Nanoscience & Nanotechnology
Sang Won Lee, Jeong Mok Oh, Jae Hyeok Kim, Chan Hee Park, Jae-Keun Hong, Jong-Taek Yeom
Summary: This study investigated Ti-4.5Al-2.5Fe-0.25Si and Ti-4.6Al-2.0Fe-0.25Si alloys demonstrating martensite reorientation induced plasticity (MRIP) using ex-situ electron backscattering diffraction and field-emission transmission electron microscopy. The alloys exhibited a combination of strength and ductility, with primary alpha, retained beta, and athermal martensite in their microstructure. Deformation induced reoriented martensite was observed, leading to grain refinement and martensite reorientation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Cheng-Lin Li, Chang-Shun Wang, P. L. Narayana, Jae-Keun Hong, Seong-Woo Choi, Jae H. Kim, Sang Won Lee, Chan Hee Park, Jong-Taek Yeom, Qingsong Mei
Summary: This study demonstrates that annealing at 650 degrees C of SLM CP-Ti can create an equiaxed structure, resulting in a weakened texture. The formation of equiaxed grains occurs at two types of microstructural features, acicular a' and irregular massive (alpha'm) martensite, with different formation mechanisms.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Environmental Sciences
A. K. Maurya, M. Nagamani, Seung Won Kang, Jong-Taek Yeom, Jae-Keun Hong, Hyokyung Sung, C. H. Park, Paturi Uma Maheshwera Reddy, N. S. Reddy
Summary: Arsenic contamination is a global health issue and a reliable model for wastewater treatment is essential. This study developed a data-driven artificial neural network software to predict and validate the removal of As(V) from aqueous solutions using graphene oxide. The model accurately predicted arsenic removal efficiency under various experimental conditions and provided insights for controlling its operation.
ENVIRONMENTAL RESEARCH
(2022)
Article
Chemistry, Physical
P. L. Narayana, Jae H. Kim, Dae Won Yun, Seung-Eon Kim, N. S. Reddy, Jong-Taek Yeom, Dongyi Seo, Jae-Keun Hong
Summary: The TNM-B1 alloy fabricated with electron beam melting exhibited superior oxidation resistance at high temperatures, with an oxide layer consisting of alternate layers of Al2O3, TiO2, and mixture phases.
Article
Chemistry, Physical
A. K. Maurya, Jong-Taek Yeom, Seung Won Kang, Chan Hee Park, Jae-Keun Hong, N. S. Reddy
Summary: The hybrid method combining WAAM and hot forging improves mechanical properties of components. Microstructure instability is observed at high strain rates and low temperatures, while dynamic recrystallization occurs at 900-950 degrees C and strain rates below 1s-1.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Jeong Mok Oh, P. L. Narayana, Jae-Keun Hong, Jong-Taek Yeom, N. S. Reddy, Namhyun Kang, Chan Hee Park
Summary: The study developed a new Ti-Al-Fe-Mn based TRIP alloy using an artificial neural network, which included lighter and/or cheaper elements, and successfully achieved high strength and ductility design goals.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Sang Won Lee, Hyeon Jin Lee, Jae Hyeok Kim, Chan Hee Park, Jae-Keun Hong, Jong-Taek Yeom
Summary: The study investigated the effect of various titanium alloys on the kinetics of alpha'-martensitic transformation under different solution treatments, showing that grain refinement inhibits the transformation process. Additionally, a modified Mo equivalent and transformation kinetics model were formulated to incorporate the prior beta grain size.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Physical
Chang-Shun Wang, Cheng-Lin Li, Yu-Ting Zuo, Jae-Keun Hong, Seong-Woo Choi, Guo-Dong Zhang, Qingsong Mei, Chan Hee Park, Jong-Taek Yeom
Summary: Laser-powder bed fusion (L-PBF) is used for manufacturing pure titanium (CP-Ti) components, but they often suffer from high strength and low ductility due to the formation of acicular alpha' martensite. Post-heat treatments can transform the martensite into equilibrium phases, improving the mechanical properties. Partial annealing can create a bimodal structure with both equiaxed and fine lamellar grains, providing CP-Ti components with high strength and ductility.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
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
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)
