检索结果-南通市图书馆

Journal of Materials Science & Technology 2022年第12期107卷 14-25页

作者： Yipeng Li Guang Ran Xinyi Liu Qing Han Xiuyin Huang Yifan Ding College of Energy Xiamen UniversityXiamen 361102China Fujian Research Center for Nuclear Engineering Xiamen 361102China

Through in-situ TEM observation during 30 keV H_(2)^(+)-He^(+) dual-beam irradiation at 723 K,the reaction and transformation of dislocation loops in pure Mo were investigated,especially for*** could directly cause the formation of 1/2loops andloops,but 1/2loops were ***-situ observation confirmed the formation mechanism ofloops,including direct irradiation induced mechanism,1/2loop direct conversion mechanism,and reaction mechanism of two 1/2***,the reaction of two 1/2loops to produceloop should not require the strict size similarity *** reaction between 1/2loops could also produce 1/2loop,which was essentially a process in which one loop absorbed another *** yield strength increment caused by irradiation-induced loops was analyzed,and its saturation value reached0.48 GPa at 0.06 *** with single He+irradiation,the number density and average diameter of loops increased significantly and more serious damage was caused under the synergistic effect of hydrogen and *** mechanism based on in-situ experimental observation was discussed in depth.

关键词： In-situ TEM observation dislocation loop Hydrogen helium irradiation Molybdenum Irradiation hardening

In-situ TEM investigation on the evolution of He bubbles and dislocation loops in Ni-based alloy irradiated by H_(2)^(+)&He^(+)dual-beam ions

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第7期138卷 36-49页

作者： Zhenbo Zhu Weichi Ji Hefei Huang Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

The synergistic evolution mechanisms of He bubbles and dislocation loops under 30 keV H_(2)^(+)&He^(+)dual-beam ions irradiation at 650℃ in the Ni-based alloy GH3535,which is the most promising candidate structure material for molten salt reactors(MSRs),were revealed via in-situ *** nucleation,merg-ing,and change in the size of the dislocation loops and He bubbles were characterized in detail to study the influences of irradiation fluence and pre-existing dislocation loops on their *** number density of both the He bubbles and dislocation loops increases rapidly and subsequently saturates,whereas their size continuously increases with the increasing ion ***-existing dislocation loops with strong absorption characteristics grow preferentially and suppress the nucleation of dislocation loops during the dual-beam ions ***,the bubbles tend to nucleate within the dislocation loops to form bubble-loop complexes,and then decrease in their number *** details of the un-faulting processes of the Frank loops were discussed,where the energy difference between the two types of loops as well as the evolution of the inside Shockley dislocation loops dominates the unfaulting *** several evolution stages of the loop-punching mechanism are revealed,and the emitted loops can directly form perfect loops as well as unfault the neighboring Frank *** He bubbles inside the loops provide corresponding stress for the formation of rhombic loops,which can achieve rapid growth and sweep ability by merging with the neighboring ***,its dissociation to Shockley dis-location can unfault the Frank loops along their slip *** the four Frank loop variations,the edge-on Frank loop variations have the highest growth rate,followed by the perfect *** related mechanisms based on in-situ experimental observation are discussed in depth.

关键词： In-situ TEM observation Ni-based alloy dislocation loop Punching loop Bubble-loop complex

Effect of dose rate on the characteristics of dislocation loops in palladium:In-situ TEM analysis during 30 keV H_(2)^(+)irradiation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第19期150卷 86-95页

作者： Dewang Cui Ziqi Cao Yifan Ding Yipeng Li Guang Ran College of Energy Xiamen UniversityXiamen 361102China Fujian Research Center for Nuclear Engineering Xiamen 361102China

Ion irradiation is usually used to simulate neutron irradiation to accelerate the evaluation of the irradia-tion behavior of reactor ***,the validity of using a high damage rate of ion irradiation to simulate a low damage rate of neutron irradiation has always been a controversial ***,the effect of two dose rates(2.94×10^(-6) and 7.35×10^(-5) dpa s^(-1))on the characteristics and evolution of dislo-cation loops in palladium was studied in situ during 30 keV H2+irradiation using transmission electron *** dose rate obviously affected the nucleation rate and growth rate of dislocation loops,the types(Frank loops or perfect loops)of dislocation loops,and the irradiation hardening and total damage obtained from the product of average loop size and loop *** the same irradiation dose,a high dose rate would lead to high loop density,small average loop size,low loop growth rate,and low irra-diation hardening and damage induced by loops in pure ***,it was found for the first time that a high dose rate was beneficial to the generation of perfect dislocation *** effect of dose rate was attributed to the different dynamic equilibrium results between the effective generation rate of point defects and their absorption rate by existing *** present results show that the effect of dose rate should be considered when using ion irradiation to simulate neutron irradiation to evaluate the irradiation damage to materials.

关键词： Palladium Hydrogen irradiation In-situ TEM observation dislocation loop Dose rate

In-situ TEM observation of the evolution of helium bubbles & dislocation loops and their interaction in Pd during He^(+) irradiation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第28期87卷 108-119页

作者： Qing Han Yipeng Li Guang Ran Xinyi Liu Lu Wu Yang Chen Piheng Chen Xiaoqiu Ye Yifan Ding Xiaoyong Wu College of Energy Xiamen UniversityXiamen361102China The First Sub-institute Nuclear Power Institute of ChinaChengdu610041China Fujian Research Center for Nuclear Engineering Xiamen361102China Science and Technology on Surface Physics and Chemistry Laboratory China Academy of Engineering PhysicsJiangyou621700China

The microstructural evolution of purity Pd under 30 keV He^(+)irradiation at 573 K was investigated by in-situ transmission electron *** nucleation,growth,merging,annihilation,size change,number density variation,and types of dislocation loops were analyzed under the influence of irradiation fluence and sample *** perfect dislocation loops with b=1/2and faulted dislocation loops with b=1/3were ***,at low irradiation fluence,most of the loops were 1/3*** thickness of TEM foil obviously affected the ratio of 1/3loop variants,the size and number density of dislocation loops,and the characteristics of bubble-loop *** the increase of irradiation fluence,the size of dislocation loops increased,but loop volume number density remained almost constant until dislocation loops merged and evolved into dislocation *** was an obvious interaction between dislocation loops and bubbles,indicating that 1/3loop was first formed at the initial stage of irradiation,and when the loop grew to a certain size,obvious helium bubbles appeared inside its region.

关键词： In-situ TEM observation dislocation loop Helium bubble Ion irradiation Palladium

Line-integral representations for extended displacements, stresses,and interaction energy of arbitrary dislocation loops in transversely isotropic magneto-electro-elastic bimaterials

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2014年第8期35卷 1005-1028页

作者：袁江宏陈伟球 E.PAN Department of Civil Engineering Zhejiang University Department of Engineering Mechanics Zhejiang University Department of Civil Engineering and Department of Applied Mathematics University of AkronAkronOH 44325U.S.A.

In addition to the hexagonal crystals of class 6 mm, many piezoelectric materials （e.g., BaTiO3）, piezomagnetic materials （e.g., CoFe2O4）, and multiferroic com-posite materials （e.g., BaTiO3-CoFe2O4 composites） also exhibit symmetry of transverse isotropy after poling, with the isotropic plane perpendicular to the poling direction. In this paper, simple and elegant line-integral expressions are derived for extended displace-ments, extended stresses, self-energy, and interaction energy of arbitrarily shaped, three-dimensional （3D） dislocation loops with a constant extended Burgers vector in trans-versely isotropic magneto-electro-elastic （MEE） bimaterials （i.e., joined half-spaces）. The derived solutions can also be simply reduced to those expressions for piezoelectric, piezo-magnetic, or purely elastic materials. Several numerical examples are given to show both the multi-field coupling effect and the interface/surface effect in transversely isotropic MEE materials.

关键词： dislocation loop multiferroic transverse isotropy bimaterial half space extended displacement extended stress interaction energy

Transmission electron microscopy characterization of dislocation loops in irradiated zirconium

在线全文

学校读者我要写书评

暂无评论

Tungsten 2021年第4期3卷 470-481页

作者： Si-Mian Liu Wei-Zhong Han Center for Advancing Materials Performance from the Nanoscale State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an 710049China

Characterization of irradiation defects is of great importanceto mitigate irradiation damage,reduce irradiation growth and tune mechanical properties in Zr ***,we describe a practical method to characterize the dislocation loops in irradiated Zr using conventional transmission electron microscopy(TEM).Vacancy or interstitial nature of dislocation loops is determined using the inside and outside contrast *** habit plane of dislocation loops is determined by tilting the sample to multiple zone axes and judged based on the projected loop *** size ofloops is measured by tilting the sample to an edge-on position and the loop number is counted under a weak-beam dark-field TEM condition.loops have a line contrast under viewing direction of a-axis and a circular shape under viewing direction of *** addition,a large number of triangle-shaped vacancy platelets(TVPs)were formed on the basal *** increasing the irradiation damage from 0.5 to 1.5 dpa,the number density ofloops keeps constant,while the number density of TVPs increased significantly,owing to the anisotropic diffusion and accumulation of point defects within basal *** methods introduced here are easy to follow and extend into other related investigations.

关键词： Irradiation damage dislocation loop Habit plane Zirconium alloys

In-situ study of initiation and extension of nano-thick defect-free channels in irradiated nickel

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第23期58卷 114-119页

作者： Shihao Li Ning Gao Weizhong Han Center for Advancing Materials Performance from the Nanoscale State Key Laboratory for Mechanical Behavior of MaterialsXi’an Jiaotong UniversityXi’an710049PR China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001PR China Institute of Frontier and Interdisciplinary Science and Key Laboratory of Particle Physics and Particle Irradiation Shandong UniversityQingdao266237PR China Institute of Modern Physics Chinese Academy of SciencesLanzhou730000PR China

Radiation defects-induced plastic flow localization is the origin of loss of ductility in irradiated ***-free channels(DFCs)are a typical form of strain localization that lead to crack initiation and premature failure.A comprehensive understanding of the DFC dynamics is key to managing radiation boosted property *** great research efforts,a clear mechanism of DFC remains ***,our in-situ tests on irradiated Ni pillars provide a real-time observation of the dynamics of DFCs,including DFC initiation,extension and *** merging and spreading of dislocation loops serve as an alternative mechanism of dislocation sources that emit massive dislocations and initiate nano-thick DFCs inside the ***-thick DFCs were formed through chopping up or sweeping away of loops by mobile *** of opposite loops and interactions between loops and vacancies accelerate DFC *** of multiple dislocation sources and dislocation cross-slips are the mechanisms for DFC thickening.

关键词： Defect-free channel dislocation loop In-situ Strain localization

Effect of Post-irradiation Annealing on Microstructure Evolution and Hardening in GH3535 Alloy Irradiated by Au Ions

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1903-1911页

作者： Cunyun Hu Hefei Huang Zhenbo Zhu Awen Liu Yan Li School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China Shanghai Instituteof AppliedPhysics ChineseAcademy of SciencesShanghai 201800China School of Nuclear Scienceand Technology University of Chinese Academy of SciencesBeijing 100049China

The Au ion-irradiation experiments of GH3535 alloy,a candidate alloy structural material for molten salt reactor,was carried out in this ***,isochronous annealing experiments were conducted from 200 to 850 ℃ to clarify the evolution behavior of damage defects with increasing *** coarsening of dislocation loops and formation and dissolution of precipitates with increasing annealing temperature were characterized by transmission electron *** was performed to measure the variation of hardness caused by ***,the relationship between irradiation hardening and microstructure evolution was *** study lays a foundation for the evaluation of irradiation damage properties of GH3535 alloy at different annealing temperatures.

关键词： Nickel-based alloy Irradiation Annealing dislocation loop Precipitate

Microstructure change in deuterium implanted CLAM steel induced by electron irradiation

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2011年第1期54卷 111-114页

作者： HUANG YiNa WAN FaRong XIAO Xin OHNUKI Somei HASHIMOTO Naoyuki Department of Material Physics and Chemistry University of Science and Technology Beijing Beijing 100083 China Beijing Key Laboratory of New Energy and Technology Beijing 100083 China Faculty of Engineering Hokkaido University Sapporo 060-8628 Japan

As Reduced Activation Ferritic/Martensitic (RAFM) steel is considered the primary candidate for use as a structural material in fusion power reactors,many countries are developing different kinds of *** is developing new CLAM (China Low Activation Martensitic) *** study investigates microstructural changes in CLAM steel implanted with deuterium ions induced by 1250 keV electron irradiation from *** 873 K,and observes both the growth and shrinkage of the defect clusters produced by deuterium ion implantation under the electron irradiation.

关键词： low activation steel deuterium irradiation damage dislocation loop void

在线全文

学校读者我要写书评

暂无评论

各向异性压电晶体中位错环形成的场

各向异性压电晶体中位错环形成的场