Article
Materials Science, Multidisciplinary
Lixia Ma, Min Wan, Weidong Li, Jie Shao, Xiaoning Han, Jichun Zhang
Summary: This study systematically investigated the superplastic deformation microstructure evolution and mechanism of the new near-alpha TNW700 titanium alloy at different strain rates and true strains. Results showed that the alloy exhibited excellent superplastic behavior within a certain strain rate range, with decreasing peak stress and significant strain hardening followed by flow softening. Electron backscatter diffraction and high resolution transmission electron microscopy were used to characterize the microstructure.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Zhuangzhuang Zheng, Shulong Xiao, Xiaosong Wang, Yingfei Guo, Jianhui Yang, Lijuan Xu, Yuyong Chen
Summary: The study found that silicides in the alloy can effectively hinder the movement of dislocations, thus having a positive effect during high-temperature creep. The main failure mechanism of the as-cast alloy during creep was the formation, growth, and coalescence of cracks at the grain boundary.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Yang Xiang, Wei Xiang, Wuhua Yuan
Summary: Analyzing the microstructure of Ti-55531 alloy under different deformation conditions during hot compression in the alpha + beta phase region, it was found that the flow softening phenomenon is influenced by a combination of mechanisms. Deformation heat causes significant flow softening at a strain rate of 1 s-1, while dynamic recrystallization has little contribution. With increasing deformation temperature and strain rate, the flow softening fraction f V decreases due to the shift in alpha p phase volume fraction, from 16.6% at 760°C and 0.001 s-1 to 1.4% at 840°C and 1 s-1. The flow softening fraction f SF is 3.95% at 790°C and 5.34% at 820°C as a result of texture evolution. (c) 2023 Elsevier B.V. All rights reserved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Lu Li, Guodong Ma, Haiguang Huang, Han Xiao, Zhentao Yuan, Yongkun Li, Rongfeng Zhou
Summary: This study investigated the flow behavior and instability prediction of the TA10 titanium alloy during isothermal compression, revealing flow softening mechanisms and instability criteria under different deformation temperatures. Suitable processing parameters were proposed based on microstructural analysis and flow stress-strain curves.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Yu Zhou, Ke Wang, Honghui Li, Xin Wen, Renlong Xin
Summary: This study investigates the influence of equiaxed α content (a(e)) and configuration of α lamellas on the deformation mechanism and tensile properties of near-α titanium alloy. The bimodal microstructures (BMs) comprised of a(e) and parallel α lamellas (a colony) and basket-weave α lamellas (a basketweave) are denoted as BMC and BMB, respectively. With decreasing content of a(e), BMB shows higher strength and lower elongation reduction compared to BMC. Under the same content of a(e), BMB exhibits higher strength and better elongation than BMC. The deformation mechanisms of fully equiaxed microstructure (FEM), BMC, and BMB are investigated, revealing that prismatic slip is the dominant slip system and dislocation multiplication of prismatic slip dominates all a(e) grains. Basket-weave microstructure shows better slip transfer restraint and absence of continuous a(GB), leading to higher strength and better elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Civil
Xiaoming Yang, Baoyu Wang, Jing Zhou, Wenchao Xiao, Pengni Feng
Summary: This paper established a unified viscoplastic constitutive model for Ti-6Al-4V alloy coupling with damage and softening mechanisms to predict flow behaviors and damage evolution in hot tensile process. The model was validated through hot tensile tests, SEM observation of microstructure evolution, and prediction of flow stress and damage evolution. The results demonstrated that the flow stress and damage evolution can be accurately predicted by the constitutive model, showing good predictability in fracture due to damage.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Xiaoyong Liu, Jia Wang, Lingqing Gao, Ruiwu Li, Xianfu Luo, Wenli Zhang, Xinyao Zhang, Xiaoqin Zha
Summary: The hydrogen embrittlement of near alpha Ti-2.5Al-2Zr-1Fe alloy is demonstrated by the decreasing of impact toughness with increasing hydrogen content in the near surface layer. The formation of hydrides and weakening of beta phase are likely related to the embrittlement mechanisms.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Yali Xu, Binbin Zhang
Summary: Hydrogen has a significant impact on the mechanical properties and deformation behavior of near-alpha alloy Ti-6Al-3Nb-2Zr-1Mo, enhancing strength and plasticity while affecting impact toughness differently at varying hydrogen content levels. Hydrogen inhibits twinning, enhances dislocation slip, and alters deformation behavior by activating basal and pyramidal slip and suppressing prismatic slip.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Lixia Ma, Xiuquan Han, Jichun Zhang, Weidong Li
Summary: The superplastic deformation and microstructure evolution of TNW700 titanium alloy were investigated in this study. The alloy exhibited excellent superplasticity at temperatures of 900-950°C and strain rates of 0.0005-0.01s(-1), with elongation above 300% and m value above 0.41. The increase of ss phase volume fraction induced by dynamic phase transformation contributed to flow softening, while the refinement of primary a grains and the inconspicuous growth of ss grains enhanced grain boundary sliding and superplasticity. The alloy also showed high temperature softening and strain rate hardening behaviors.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Sumit Ghosh, Atef Hamada, Madan Patnamsetty, Wojciech Borek, Mohammed Gouda, Akihiko Chiba, Saad Ebied
Summary: The present study designed a new biomaterial Ti-14Cr alloy for biomedical applications and investigated its manufacturing process through hot deformation. A processing map was constructed to evaluate the hot workability and deformation mechanisms of the alloy at different temperature and strain rate ranges. The study identified the optimal parameters for hot deformation and established a mathematical relation to elucidate the influence of true strain on material constants. The research provides important insights for optimizing the hot deformation parameters and controlling the grain structure of the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Yali Xu, Liang Ding, Chong Li, Bobo Li, Shuaifeng Zhang, Jinshan Li, Fuyang Gao, Zhijie Sun, Peng Jiang, Minjie Lai
Summary: The deformation behavior of the near-α titanium alloy Ti-6Al-3Nb-2Zr-1Mo with hydrogen was studied at different strain rates. It was found that increasing hydrogen concentration improves ductility at a strain rate of 10(-3) s(-1), but deteriorates ductility at higher strain rates. The presence of hydrogen enhances strain localization at higher strain rates, leading to reduced ductility, while at lower strain rates, hydrogen promotes dislocation mobility and increases ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Qiang Fu, Wuhua Yuan, Wei Xiang
Summary: This study investigated the dynamic softening mechanisms and hot workability of the TB18 titanium alloy. The results showed a significant decrease in flow stress with increasing deformation temperature and decreasing strain rate. A constitutive equation was established and the deformation activation energy was calculated. The processing map exhibited stability and instability regions, and microstructure characteristics demonstrated different dynamic softening mechanisms in these regions.
Article
Nanoscience & Nanotechnology
Yong Wu, Ronglei Fan, Minghe Chen, Kehuan Wang, Jie Zhao, Wenchao Xiao
Summary: The study focused on investigating the high-temperature anisotropy and microstructure evolution mechanisms of the rolled TA32 titanium alloy sheet. It was found that the TD sample exhibited the largest peak strength, while the DD sample displayed the highest elongation. The dominant dislocation slip modes for RD, DD, and TD samples were identified as prismatic slip, the coupling of basal and prismatic slips, and pyramidal slips, respectively. Furthermore, the DRX mechanism of TA32 titanium alloy during hot deformation was a combination of DDRX and CDRX, which could weaken the anisotropy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Haiyang Jiang, Fuqing Jiang, Bijun Xie, Bing Wang, Bin Xu, Xu Hu, Liang Xu, Zhangxun He, Hao Zhang, Yuxi Wu, Mingyue Sun
Summary: This study investigates the influence of cooling rate on microstructural evolution and mechanical properties of titanium alloy forgings. By using mechanical tests and microscopy techniques, it is found that increasing cooling rate leads to a decrease in secondary alpha phase width and an increase in ultimate tensile strength and yield strength. However, the impact property of the alloy decreases due to a decrease in primary alpha phase volume fraction. Quantitative links between cooling rate and alpha phase width, as well as between yield strength and alpha phase width, are established.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Zhiyuan Jia, Qinyang Zhao, Yong Zhang, Yiku Xu, Yongnan Chen, Xiaotong Deng, Fengying Zhang, Lin Wang, Dizi Guo
Summary: The mechanical properties, microstructure evolution mechanism, texture variation process, and deformation mechanism of a near-alpha CT20 titanium alloy with different hot and cold rolling reductions were thoroughly investigated. It was found that the increase in rolling reduction led to a gradual increase in tensile strength and decrease in ductility. The mechanical properties were better along the rolling direction (RD) than the transverse direction (TD), which was attributed to the increase in grain boundary and dislocation density. The work-hardening rates and mechanical properties were influenced by the preferred orientation of alpha phase and the slip distances of dislocation during deformation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(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)