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A review of solute-point defect interactions in vanadium and its alloys: first-principles modeling and simulation

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Tungsten 2021年第1期3卷 38-57页

作者： peng-Bo Zhang Ji-Jun Zhao Ting-Ting Zou Rui-Huan Li peng-fei zheng Ji-Ming Chen School of Science Dalian Maritime UniversityDalian 116026China Key Laboratory of Materials Modification by Laser Ion and Electron Beams(Ministry of Education)Dalian University of TechnologyDalian 116024China Information Science and Technology College Dalian Maritime UniversityDalian 116026China Institute of Mold Technology Changzhou Vocational Institute of Mechatronic TechnologyChangzhou 213164China Southwestern Institute of Physics Chengdu 610041China

Vanadium alloys are the promising first wall and blanket materials for fusion *** amounts of helium(He)and hydrogen(H)impurities are produced inside the materials along with irradiation defects under neutron irradiation,leading to bubble formation and microstructure changes,which will degrade the thermal and mechanical properties of vanadium *** microstructure changes of materials are influenced by the interactions of point defects with solute ***,first-principles calculations are intensively performed to elucidate these interactions,clustering,and dissolution,which can provide valuable information for the design of high-performance anti-irradiation *** paper reviews the recent findings of the interactions of point defects(vacancies,self-interstitial atoms)with substitutional solutes and interstitial solutes(C,O,N,H,and He)as well as their clusters in vanadium and its alloys from first-principles calculations.

关键词： Solute atom Point defect Radiation damage H and He effect Vanadium alloys Density functional theory

Optical spectroscopy study of damage evolution in 6H-SiC by H_(2)^(+)implantation

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Chinese Physics B 2021年第5期30卷 75-80页

作者： Yong Wang Qing Liao Ming Liu peng-fei zheng Xinyu Gao zheng Jia Shuai Xu Bing-Sheng Li China Institute for Radiation Protection Taiyuan 030006China State Key Laboratory for Environment-Friendly Energy Materials Southwest University of Science and TechnologyMianyang 621010China Southwestern Institute of Physics Chengdu 610041China Engineering Research Center of Biomass Materials Ministry of EducationSouthwest University of Science and TechnologyMianyang 621010China

Lattice defects induced by ion implantation into SiC have been widely investigated in the decades by various *** of the non-destructive techniques suitable to study the lattice defects in SiC is the optical *** this work,confocal Raman scattering spectroscopy and photoluminescence spectrum have been used to study the effects of 134-keV H_(2)^(+)implantation and thermal treatment in the microstructure of 6H-SiC single *** radiation-induced changes in the microstructure were assessed by integrating Raman-scattering peaks intensity and considering the asymmetry of Raman-scattering *** integrated intensities of Raman scattering spectroscopy and photoluminescence spectrum decrease with increasing the *** recovery of the optical intensities depends on the combination of the implantation temperature and the annealing temperature with the thermal treatment from 700℃to 1100℃.The different characterizations of Raman scattering spectroscopy and photoluminescence spectrum are compared and discussed in this study.

关键词： SiC H_(2)^(+)implantation Raman scattering spectroscopy photoluminescence spectrum

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Tungsten 2020年第1期2卷 101-106页

作者： Li‑Wen Zhang Hai‑Ying Fu Zong‑Jian Chai peng‑fei zheng Ran Wei Ming Zhang Ji‑Ming Chen Southwestern Institute of Physics Chengdu 610225China

Carbide-dispersion strengthened(CDS)vanadium alloy is a kind of advanced structural material for V/Li fusion *** welding technology for the alloy is very important for its application in fusion *** the present study,preliminary investigation on dissimilar-metal bonding by hot isostatic pressing(HIP)was carried out for the CDS V alloy by joining with the conventional V-4Cr-4Ti *** characterization for the bonding interfaces and mechanical tests for bonding property evaluation were analyzed for the HIP *** results show that after the HIP,the grain size of the V-4Cr-4Ti base metal(BM)obviously increases,while the grain size near the interface is much smaller than that in the V-4Cr-4Ti *** is the reason why the hardness near the interface is larger than that of the V-4Cr-4Ti *** shear test evaluation,the HIP joint possesses good bonding property with sound strength and *** there is no phase transformation during HIP,no post-bond heat treatment(PBHT)is necessary for the dissimilar-metal joint.

关键词： Dissimilar-metal bonding Carbide-dispersion strengthened vanadium alloy Hot isostatic pressing Bonding interface Shear strength

Optimizing the key parameter to accelerate the recovery of AMOC under a rapid increase of greenhouse gas forcing

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Atmospheric and Oceanic Science Letters 2025年第1期18卷 39-45页

作者： Haolan Ren fei zheng Tingwei Cao Qiang Wang International Center for Climate and Environment Science(ICCES) Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina University of Chinese Academy of Sciences BeijingChina College of Oceanography Hohai UniversityNanjingChina CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of Sciences and Pilot National Laboratory for Marine Science and Technology(Qingdao)QingdaoChina

Atlantic Meridional Overturning Circulation(AMOC)plays a central role in long-term climate variations through its heat and freshwater transports,which can collapse under a rapid increase of greenhouse gas forcing in climate *** studies have suggested that the deviation of model parameters is one of the major factors in inducing inaccurate AMOC *** this work,with a low-resolution earth system model,the authors try to explore whether a reasonable adjustment of the key model parameter can help to re-establish the AMOC after its *** a new optimization strategy,the extra freshwater flux(FWF)parameter is determined to be the dominant one affecting the AMOC’s *** traditional ensemble optimal interpolation(EnOI)data assimilation and new machine learning methods are adopted to optimize the FWF parameter in an abrupt 4×CO_(2) forcing experiment to improve the adaptability of model parameters and accelerate the recovery of *** results show that,under an abrupt 4×CO_(2) forcing in millennial simulations,the AMOC will first collapse and then re-establish by the default FWF parameter ***,during the parameter adjustment process,the saltier and colder sea water over the North Atlantic region are the dominant factors in usefully improving the adaptability of the FWF parameter and accelerating the recovery of AMOC,according to their physical relationship with FWF on the interdecadal timescale.

关键词： Recovery of AMOC 4×CO_(2)forcing Key parameter Parameter estimation Data assimilation Machine learning

Multi boron-doping effects in hard carbon toward enhanced sodium ion storage

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Journal of Energy Chemistry 2025年第1期100卷 730-738页

作者： peng zheng Wang Zhou Ying Mo Biao zheng Miaomiao Han Qin Zhong Wenwen Yang peng Gao Lezhi Yang Jilei Liu College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Greater Bay Area Institute for Innovation Hunan University Changsha Research Institute of Mining & Metallurgy Co. LTD.

Hard carbon （HC） has been considered as promising anode material for sodium-ion batteries （SIBs）.The optimization of hard carbon’s microstructure and solid electrolyte interface （SEI） property are demonstrated effective in enhancing the Na+storage capability,however,a one-step regulation strategy to achieve simultaneous multi-scale structures optimization is highly ***,we have systematically investigated the effects of boron doping on hard carbon’s microstructure and interface chemistry.A variety of structure characterizations show that appropriate amount of boron doping can increase the size of closed pores via rearrangement of carbon layers with improved graphitization degree,which provides more Na+storage ***-situ Fourier transform infrared spectroscopy/electrochemical impedance spectroscopy （FTIR/EIS） and X-ray photoelectron spectroscopy （XPS） analysis demonstrate the presence of more BC3and less B–C–O structures that result in enhanced ion diffusion kinetics and the formation of inorganic rich and robust SEI,which leads to facilitated charge transfer and excellent rate *** a result,the hard carbon anode with optimized boron doping content exhibits enhanced rate and cycling *** general,this work unravels the critical role of boron doping in optimizing the pore structure,interface chemistry and diffusion kinetics of hard carbon,which enables rational design of sodium-ion battery anode with enhanced Na+storage performance.

关键词： X ray photoelectron spectroscopy

Synergistic effect of bonding heterogeneity and phonon localization in introducing excellent thermoelectric properties in layered heteroanionic NdZnSbO material

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Journal of Energy Chemistry 2025年第1期100卷 259-272页

作者： Da Wan Shuwei Tang Shulin Bai Xiaodong Li peng Ai Wanrong Guo Tuo zheng College of Materials Science and Engineering Liaoning Technical University Faculty of Chemistry Northeast Normal University

Layered rare-earth metal oxides, harnessing the dual properties of oxides and two-dimensional layered materials, exhibit remarkable thermal stability and quantum confinement effects. Therefore, this work adopts the first-principles calculation combined with the Boltzmann transport theory to predict the thermoelectric properties of NdZnSbO compound. The coexistence of weak interlayer van der Waals interactions, robust intralayer ionic bonding, and partial covalent bonding leads to remarkable bonding heterogeneity, which engenders pronounced phonon scattering and imposes constraints on thermal transport along the out-of-plane direction. The weakened chemical bonds induced by the antibonding states, together with the rattling-like behavior of the Zn atom, culminate in the profound anharmonicity in the layered NdZnSbO compound. The weakening bond and heavy element contribute to the softness of phonon modes, which significantly diminishes the phonon group velocity. The redistribution-dominated four-phonon scattering process spans a large optical gap, which effectively reduces the lattice thermal conductivity. The NdZnSbO compound exhibits direct semiconductor characteristic with a bandgap of 0.73 e V by adopting the Heyd-Scuseria-Ernzerhof(HSE06) functional in combination with spin–orbit coupling(SOC) effect. The multi-valley feature of NdZnSbO compound augur favorably for band degeneracy, thus amplifying the power factor. Consequently, an optimal figure-of-merit(ZT) of 3.40 at 900 K is achieved for the n-type NdZnSbO compound. The present study delves deeply insights into the origins for the low thermal conductivity of NdZnSbO compound and proposes an optimization scheme to enhance overall thermoelectric performance.

关键词： Bond strength (chemical)

Precise gradient separation of nanoparticles using reduced graphene oxide-polyoxomolybdate membranes

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Science China Chemistry 2025年第01期 209-216页

作者： Yixin Yang Wanlei Zhao Ruoxuan zheng Hongqiang Li Wei Chen Yu-fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Quzhou Institute for Innovation in Resource Chemical Engineering

The purification and size sieving of nanoparticles （NPs） represents a significant scientific ***,the r GO-polyoxometalates (POMs=PMo12,Mo132and Mo368) membranes were fabricated successfully via a simple and scalable POMsassisted in-situ photoreduction *** the mass ratio of r GO to PMo12was 1:30,the resultant r GO-PMo12membranes with highly ordered and uniform nanochannels of 1.0 nm can be obtained,which showed an accurate carbon quantum dots（CQDs） separation with a cut-off size approximately 1.0 *** increase of the size of the interlayered POMs from PMo12（1.0 nm）,{Mo132}（2.9 nm） to{Mo368}（3.8 nm）,the resultant r GO-PMo12,r GO-Mo132and r GO-Mo368exhibited precise gradient separation of CQDs and Au nanoparticles by size exclusion *** results pave a promising way to construct new twodimensional （2D） membranes for highly efficient size-selective separation.

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Activation of adult endogenous neurogenesis by a hyaluronic acid collagen gel containing basic fibroblast growth factor promotes remodeling and functional recovery of the injured cerebral cortex

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Neural Regeneration Research 2025年第10期20卷 2923-2937页

作者： Yan Li peng Hao Hongmei Duan fei Hao Wen Zhao Yudan Gao Zhaoyang Yang Kwok-Fai So Xiaoguang Li Department of Neurobiology School of Basic Medical SciencesCapital Medical UniversityBeijingChina China Rehabilitation Science Institute China Rehabilitation Research CenterBeijing Key Laboratory of Neural Injury and RehabilitationBeijingChina Center of Neural Injury and Repair Beijing Institute for Brain DisordersBeijingChina Beijing Key Laboratory for Biomaterials and Neural Regeneration School of Engineering MedicineBeihang UniversityBeijingChina Guangdong-HongKong-Macao Institute of CNS Regeneration Ministry of Education CNS Regeneration Collaborative Joint LaboratoryJinan UniversityGuangzhouGuangdong ProvinceChina Bioland Laboratory(Guangzhou Regenerative Medicine and Health Guangdong Laboratory) GuangzhouGuangdong ProvinceChina Department of Ophthalmology and State Key Laboratory of Brain and Cognitive Sciences The University of Hong KongHong Kong Special Administration RegionChina Center for Brain Science and Brain-Inspired Intelligence Guangdong-HongKong-Macao Greater Bay AreaGuangzhouGuangdong ProvinceChina Co-innovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina Department of Biomedical Engineering School of Biological Science and Medical EngineeringBeihang UniversityBeijingChina

The presence of endogenous neural stem/progenitor cells in the adult mammalian brain suggests that the central nervous system can be repaired and regenerated after ***,whether it is possible to stimulate neurogenesis and reconstruct cortical layers II to VI in non-neurogenic regions,such as the cortex,remains *** this study,we implanted a hyaluronic acid collagen gel loaded with basic fibroblast growth factor into the motor cortex immediately following traumatic *** findings reveal that this gel effectively stimulated the proliferation and migration of endogenous neural stem/progenitor cells,as well as their differentiation into mature and functionally integrated ***,these new neurons reconstructed the architecture of cortical layers II to VI,integrated into the existing neural circuitry,and ultimately led to improved brain *** findings offer novel insight into potential clinical treatments for traumatic cerebral cortex injuries.

关键词： adult endogenous neurogenesis basic fibroblast growth factor-hyaluronic acid collagen gel cortical remodeling functional recovery migration motor cortex injury neural circuits neural stem cells newborn neurons proliferation

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高镁铝合金铸造缺陷机制分析及对策

轻合金加工技术 2017年第5期45卷 19-22页

作者：彭斐郑许李承波刘俊生广西南南铝加工有限公司广西南宁530031 广西航空航天铝合金材料与加工研究院广西南宁530031

对高镁5A06铝合金铸锭夹杂缺陷进行了分析研究。对不合格品进行剖伤后,采用光学显微镜、扫描电子显微镜对缺陷进行分析。结果表明,在熔炼和精炼过程中含Mn和Ti的粗大化合物富集长大,Al和Mg的细小氧化物颗粒吸附在这些粗大化合物周围从... 详细信息

对高镁5A06铝合金铸锭夹杂缺陷进行了分析研究。对不合格品进行剖伤后,采用光学显微镜、扫描电子显微镜对缺陷进行分析。结果表明,在熔炼和精炼过程中含Mn和Ti的粗大化合物富集长大,Al和Mg的细小氧化物颗粒吸附在这些粗大化合物周围从而产生裂纹。加强对各个工序的控制,尤其是加强对熔体的精炼,控制熔体在熔炼炉中的时间不超过6 h,在保温炉中不超过10 h,熔炼时添加少量Be元素,这样可有效地控制5A06铝合金铸锭的夹杂和开裂。

关键词： 5A06铝合金夹杂缺陷分析预防措施