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In-situ TEM study on the evolution of Dislocation loops and bubbles in CeO_(2)during Kr^(+)single-beam and Kr^(+)-H_(2)^(+)dual-beam synergetic irradiation

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Journal of Materials Science & Technology 2022年第28期123卷 49-59页

作者： Ziqi Cao Guang Ran Zhen Wang Yipeng Li Xiaoyong Wu Lu Wu Xiuyin Huang Huajun Mo College of Energy Xiamen UniversityXiamen 361102China The First Sub-Institute Nuclear Power Institute of ChinaChengdu 610041China Fujian Provincial Nuclear Energy Engineering Technology Research Center Xiamen 361102China

CeO_(2)is widely used as the nonradioactive surrogate fuel of UO_(2)when studying the irradiation performance of UO_(2).The evolution and characteristics of Dislocation loops and bubbles in CeO_(2)foils were studied by in-situ transmission electron microscopy(TEM)observation during 400 ke V Kr^(+)&30 ke V H_(2)^(+)dual-beam synergetic irradiation and 400 ke V Kr^(+)single-beam irradiation at 1073 K.The rotation of the habit plane of Dislocation loops induced by above ion irradiation was found in the CeO_(2)for the first time,such as from[211]to[311]and then to[100].The rafted loops were first observed under Kr^(+)&H_(2)^(+)dual-beam synergetic irradiation,which not only had similar[111]direction,but also belonged to perfect Dislocation loops(PDLs).The rafted loops were formed not only by the growth of loops that absorbed irradiation defects,but also by the combination of loops.But,this phenomenon of loop rafting was not obvious during Kr single-beam irradiation.It was first found that Kr^(+)irradiation induced the change of Burgers vectors of PDLs.The absorption of large PDLs to small PDLs was also observed.The average size and areal number density of Dislocation loops and gas bubbles as a function of irradiation dose were constructed,which showed that the addition of H_(2)^(+)obviously affected the characteristics of Dislocation loops and gas bubbles and the swelling of CeO_(2).

关键词： Nuclear Fuel Cerium dioxide In-situ TEM Irradiation Dislocation Bubbles

Dislocation evolution and induced precipitation on corrosion resistance of a novel Al-Mg-Zn-Er-Zr alloy during hot compression

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Rare Metals 2023年第7期42卷 2371-2380页

作者： Da Xue Wu Wei Wei Shi Xiao-Rong Zhou Sheng-Ping Wen Xiao-Lan Wu Kun-Yuan Gao Li Rong Peng Qi Hui Huang Zuo-Ren Nie Key Laboratory of Advanced Functional Materials Education Ministry of ChinaBeijing University of TechnologyBeijing100124China Institute of Corrosion Science and Technology Guangzhou510530China Department of Materials The University of ManchesterManchesterM139PLUK

Al-Mg-Zn-Er-Zr alloy was compressed in temperature range from 300 to 500℃to investigate the microstructure evolution.Molecular dynamics simulations were used to study the mechanical behavior and Dislocation evolution.The results showed that mobile Dislocations are widely distributed in alloys and make important contributions to coordinate compressive deformation.The sessile Dislocations hinder the deformation,and the content is about 1/20 of that of mobile Dislocations.Continuous dynamic recrystallization(CDRX)is considered to be the main recrystallization mechanism.The accumulation of Dislocations can provide element diffusion channels and driving force forτ(Mg_(32)[Al,Zn]_(49))phase precipitation,resulting in the forced precipitation of discontinuousτphase to replace the continuousβphase(Al_(3)Mg_(2)),which reduces the corrosion potential,resulting in increased corrosion resistance.

关键词： Al-Mg-Zn-Er-Zr alloy Dislocation Corrosion Mg_(32)(AlZn)_(49)phase Molecular dynamics

Dislocation-strained MoS_(2)nanosheets for high-efficiency hydrogen evolution reaction

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Nano Research 2022年第6期15卷 4996-5003页

作者： Shihao Wang Longlu Wang Lingbin Xie Weiwei Zhao Xia Liu Zechao Zhuang YanLing Zhuang Jing Chen Shujuan Liu Qiang Zhao College of Electronic and Optical Engineering Nanjing University of Posts and TelecommunicationsNanjing 210023China Key Laboratory for Organic Electronics and Information Displays and Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM)and Institute of Flexible Electronics(Future Technology)Nanjing University of Posts and TelecommunicationsNanjing 210023China College of Chemistry and Chemical Engineering Qingdao UniversityQingdao 266071China Department of Chemistry Tsinghua UniversityBeijing 100084China

Defect engineering is one of the effective strategies to optimize the physical and chemical properties of molybdenum disulfide(MoS_(2))to improve catalytic hydrogen evolution reaction(HER)performance.Dislocations,as a typical defect structure,are worthy of further investigation due to the versatility and sophistication of structures and the influence of local strain effects on the catalytic performance.Herein,this study adopted a low-temperature hydrothermal synthesis strategy to introduce numerous Dislocation-strained structures into the in-plane and out-of-plane of MoS_(2)nanosheets.Superior HER catalytic activity of 5.85 mmol·g^(−1)·h^(−1)under visible light was achieved based on the high-density Dislocations and the corresponding strain field.This work paves a new pathway for improving the catalytic activity of MoS_(2)via a Dislocation-strained synergistic modulation strategy.

关键词： molybdenum disulfide Dislocation strain hydrogen evolution reaction

Infrared nanoimaging of nanoscale sliding Dislocation of collagen fibrils

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Nano Research 2022年第3期15卷 2355-2361页

作者： Zhi Qiao Mengfei Xue Yongqian Zhao Yindong Huang Ming Zhang Chao Chang Jianing Chen Key Laboratory for Physical Electronics and Devices of the Ministry of Education School of Electronic Science and EngineeringXi'an Jiaotong UniversityXi’an 710049China Innovation Laboratory of Terahertz Biophysics National Innovation Institute of Defense TechnologyBeijing 100071China Wenzhou Institute University of Chinese Academy of SciencesWenzhou 325001China Institute of Physics Chinese Academy of Sciences and Beijing National Laboratory for Condensed Matter PhysicsBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Department of Neurobiology Collaborative Innovation Center for Brain Science and Shaanxi Key Laboratory of Brain DisordersSchool of Basic MedicineFourth Military Medical UniversityXi’an 710032China Songshan Lake Materials Laboratory Dongguan 523808China

Collagen,one of the major components in the mammalian connective tissues,plays an essential role in many vital physiological processes.Many common diseases,such as fibrosis,overuse injuries,and bone fracture,are associated with collagen arrangement defects.However,the underlying mechanism of collagen arrangement defects remains elusive.In this study,we applied infrared scattering-type scanning near-field optical microscopy to study collagen fibrils’structural properties.Experimentally,we observed two types of collagen fibrils’arrangement with different periodic characteristics.A crystal sliding model was employed to explain this observation qualitatively.Our results suggest that the collagen Dislocation propagates in collagen fibrils,which may shed light on many collagen diseases’pathogenesis.These findings help to understand the regulation mechanism of hierarchical biological structure.

关键词： scattering near-field optical microscopy collagen fibrils Dislocation D periodicity

Interstitial concentration effects on incipient plasticity and Dislocation behaviors of face-centered cubic FeNiCr multicomponent alloys based on nanoindentation

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Journal of Materials Science & Technology 2022年第17期112卷 212-221页

作者： Quanqing Zeng Kefu Gan Fei Chen Dongyao Wang Songsheng Zeng Research Institute of Light Alloy Central South UniversityChangsha 410083China School of Materials Science and Engineering Central South UniversityChangsha 410083China Key Laboratory of the Ministry of Education of Nonferrous Metals Central South UniversityChangsha 410083China

Interstitial atoms that commonly occupy the octahedral or tetrahedral interstices of face-centered cubic(FCC)lattice,can significantly affect the Dislocation behaviors on deformation.Recently,interstitial doping has been applied to tune the mechanical properties of the emerging multicomponent,often termed high-entropy alloys(HEAs)or medium-entropy alloys(MEAs).However,the fundamental mechanisms of the Dislocation nucleation and the onset of plasticity of interstitial multicomponent alloys governed by the concentration of interstitial atoms are still unclear.Therefore,in the present work,an instrumented nanoindentation was employed to investigate the interstitial concentration effects of carbon atoms on single FCC-phase equiatomic FeNiCr MEAs during loading.The results show that the pop-in events that denote the onset of incipient plasticity are triggered by the sudden heterogeneous Dislocation nucleation via the primary atoms-vacancy exchange with the instant stress field,regardless of the interstitial concentration.Moreover,the measured activation volumes for Dislocation nucleation of the FeNiCr MEAs are determined to be increased with the interstitial concentration,which definitely suggests the participation of interstitial atoms in the nucleation process.Besides,it is also found that the average value measured in statistics of the maximum shear stress corresponding to the first pop-in is enhanced with the interstitial concentration.Such scenario can be attributed to the improved local change transfer and lattice cohesion caused by the interstitial atoms with higher concentrations.Furthermore,the significant drag effect of interstitial carbon atoms hinders the mobile Dislocations before exhaustion,which severely suppresses the subsequent occurrence of pop-in events in the carbon-doped specimens.The work gives a microscale view of interstitial effects on the mechanical properties of multicomponent alloys,which can further help to develop new interstitial strengthening strategies for structural materials with rem

关键词： Multicomponent alloy Interstitial atoms Dislocation Nanoindentation pop-in Incipient plasticity

Ultrastrong and ductile BCC high-entropy alloys with low-density via Dislocation regulation and nanoprecipitates

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Journal of Materials Science & Technology 2022年第15期110卷 109-116页

作者： Xuehui Yan Peter K.Liaw Yong Zhang Beijing Advanced Innovation Center of Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology BeijingBeijing 100083China Department of Materials Science and Engineering The University of TennesseeKnoxvilleTN 37996United States of America

The high strength is a typical advantage of body-centered-cubic high-entropy alloys(BCC–HEAs).However,brittleness and weak strain-hardening ability are still their Achilles'heel.Here,extraordinary strength together with good tensile ductility are achieved in(Zr_(0.5)Ti_(0.35)Nb_(0.15))_(100-x)Al_(x) alloys(at.%,x=10 and 20)at room temperature.Relatively low densities of less than 6 g/cm^(3)are exhibited in these alloys.Designing nanoprecipitates and diversifying Dislocation motions are the keys to achieving such salient breakthrough.It is worth noting that the tensile strength of 1.8 GPa in(Zr_(0.5)Ti_(0.35)Nb_(0.15))_(80)Al_(20)alloy is a record-high value known in reported BCC–HEAs,as well as a tensile strain over 8%.Furthermore,the maximum strain of~25%in(Zr_(0.5)Ti_(0.35)Nb_(0.15))_(90)Al_(10)alloy can challenge existing limit value,and is accompanied with a tensile strength of 1.2 GPa.The current work does not only provide novel ultra-strong and tough structural materials with low density,but also sheds new light on designing BCC–HEAs with attractive performances and strain-hardening ability.

关键词： High-entropy alloys Mechanical properties Dislocation Nanoprecipitates Strain hardening

Single mode fiber Dislocation Mach-Zehnder interferometer cascaded with fiber Bragg grating for monitoring metal electrochemical corrosion

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Optoelectronics Letters 2023年第11期19卷 653-658页

作者： ZHANG Shuaibo LIU Xiaoqi WANG Zhi LIU Yange Tianjin Key Laboratory of Micro-scale Optical Information Science and Technology Institute of Modern OpticsNankai UniversityTianjin300350China

An optical fiber sensor composed of a Dislocation Mach-Zehnder interferometer(MZI) cascaded with a fiber Bragg grating(FBG) is proposed,and it is used to monitor the electrochemical corrosion of metals in experiments.The Dislocation interferometer is composed of two segments of single-mode fiber(SMF) and one segment of Dislocation SMF.The contact surface is increased between the fiber and the environment,which helps to improve the interference sensitivity.The relationship between the Dislocation amount and the refractive index sensitivity of the interferometer is discussed through simulation.In the experiment,the sensitivity of the interferometer reaches more than 10 000 nm/RIU,and the monitoring of metal electrochemical corrosion is also realized in 3.5% NaCl solution.The proposed measurement scheme has the advantages of small structure,low cost and high sensitivity.It has good prospects in chemical reaction monitoring.

关键词： corrosion Dislocation fiber

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前臂骨折脱位系列损伤的诊断与治疗

中华创伤骨科杂志 2023年第11期25卷 921-927页

作者：公茂琪蒋协远周君琳首都医科大学附属北京积水潭医院创伤骨科北京100035 首都医科大学附属北京朝阳医院骨科北京100020

前臂骨折脱位损伤种类繁多,受伤原因及损伤结构差异很大,治疗不当会造成前臂、肘、腕关节功能受限,影响日常生活。大家对一些少见类型的前臂骨折脱位损伤的诊疗不熟悉。我们选取创伤性单纯桡骨头脱位(isolated traumatic radial head di... 详细信息

前臂骨折脱位损伤种类繁多,受伤原因及损伤结构差异很大,治疗不当会造成前臂、肘、腕关节功能受限,影响日常生活。大家对一些少见类型的前臂骨折脱位损伤的诊疗不熟悉。我们选取创伤性单纯桡骨头脱位(isolated traumatic radial head Dislocation,ITRHD)、分离性肘关节脱位(divergent Dislocation of elbow,DDE)、汇聚性肘关节脱位(convergent Dislocation of elbow,CDE)、前臂criss-cross损伤(交叉损伤)、Essex-Lopresti损伤(前臂纵向分离)及前臂双极骨折脱位结合文献介绍,并分享我们的治疗体会。

关键词：前臂骨折肘关节脱位关节功能受限损伤种类 Dislocation 分离性骨折脱位文献介绍

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颅底凹陷症合并寰枢椎脱位的手术治疗进展

中国脊柱脊髓杂志 2023年第1期33卷 79-82页

作者：高书涛徐韬盛伟斌新疆医科大学第一附属医院脊柱外科乌鲁木齐市830054

颅底凹陷症(basilar invagination,BI)合并寰枢椎脱位(atlantoaxial Dislocation,AAD)是一类由先天性或继发性因素导致的复杂颅颈交界区病变.由于患者齿状突向上和向后移位,压迫邻近的延髓和脊髓,引起一系列神经症状.传统的经口齿状突... 详细信息

颅底凹陷症(basilar invagination,BI)合并寰枢椎脱位(atlantoaxial Dislocation,AAD)是一类由先天性或继发性因素导致的复杂颅颈交界区病变.由于患者齿状突向上和向后移位,压迫邻近的延髓和脊髓,引起一系列神经症状.传统的经口齿状突切除能够直接解除压迫,但是会导致颅颈区稳定性进一步破坏,远期效果并不理想.随着内固定技术的不断改进,后路及前后联合入路手术均能够取得良好的治疗效果.但BI合并AAD的手术治疗难度大,风险高,且手术方式的选择存在争议,笔者就该病的手术治疗进展予以综述.

关键词：寰枢椎脱位颅底凹陷症齿状突内固定技术继发性因素神经症状经口 Dislocation