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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

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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

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

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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

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Effects of Nitrogen Doping on Microstructures and Irradiation Resistance of Ti-Zr-Nb-V-Mo Refractory High-Entropy Alloy

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Acta Metallurgica Sinica(English Letters) 2024年第6期37卷 1007-1018页

作者： Huanzhi Zhang Tianxin Li Qianqian Wang Zhenbo Zhu hefei huang Yiping Lu Engineering Research Center of High Entropy Alloy Materials(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian116024China Shanghai Institute of Applied Physics Chinese Academy of Sciences(CAS)Shanghai201800China

Interstitial strengthening with nitrogen(N)is one of the effective ways to improve the mechanical properties of HEAs,but the effects of N on the microstructures and mechanical properties of the irradiated HEAs have not been studied ***,the microstructures and mechanical properties of N-free and N-doped Ti_(2)ZrNbV_(0.5)Mo_(0.2)HEAs before and after He irradiation were *** results showed that the solid solution strengthening caused by interstitial N improved the yield strength at room temperature and 1023 K without significantly reducing plasticity.N doping significantly promoted the growth,aggregation and wider spatial distribution of He bubbles by enhancing the mobility of He atoms/He-vacancy complexes,with the average size of He bubbles increasing from 10.4 nm in N-free HEA to 31.0 nm in N-doped *** addition,N-doped HEA showed a much higher irradiation hardness increment and hardening fraction than N-free *** to conventional materials doped with N,the introduction of N into Ti_(2)ZrNbV_(0.5)Mo_(0.2)HEA had adverse effects on its resistance to He bubble growth and irradiation *** results of this study indicated that N doping may not improve the irradiation resistance of HEAs.

关键词： High-entropy alloys Nitrogen doping Mechanical properties Helium bubbles Irradiation resistance

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A potential candidate structural material for molten salt reactor:ODS nickel-based alloy

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Journal of Materials Science & Technology 2022年第14期109卷 129-139页

作者： Cheng Li Guanhong Lei Jizhao Liu Awen Liu CLRen 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 School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China

The commercialisation of molten salts reactors(MSRs)is hindered by the lack of structural materials capable of withstanding the corrosive environment *** address this problem,we herein prepared1 wt%Y_(2)O_(3)mdispersion-strengthened Ni Mo-based alloys using powder metallurgy and evaluated their potential as structural materials for MSRs based on their mechanical properties,He swelling behaviour,and molten salt corrosion *** view of the strengthening provided by homogenously dispersed Y_(2)O_(3)particles,all NiMo-Y_(2)O_(3)samples exhibited ultimate tensile strengths and yield strengths exceeding those of the Hastelloy N alloy,a state-of-the-art structural material for ***,the volume fraction of He bubbles in the NiMo-Y_(2)O_(3)samples(~0.3%)was lower than that in the Hastelloy N alloy(0.58%),which showed that the introduction of Y_(2)O_(3)nanoparticles effectively inhibited He *** NiMo-Y_(2)O_(3)samples showed excellent resistance to molten salt corrosion(as reflected by the absence of obvious holes therein),thus holding great promise for the development of irradiation-and molten salt corrosion-resistant structural materials for high-temperature MSRs.

关键词： Molten salt reactor ODS nickel-based alloy Powder metallurgy Tensile mechanical properties Helium swelling resistance Molten salt corrosion

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Effect of Milling Time on the Microstructure and Tensile Properties of Ultrafine Grained Ni–SiC Composites at Room Temperature

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Journal of Materials Science & Technology 2015年第9期31卷 923-929页

作者： hefei huang Chao Yang Massey de los Reyes Yongfeng Zhou Long Yan Xingtai Zhou Shanghai Institute of Applied Physics Chinese Academy of Sciences Institute of Materials Engineering Australian Nuclear Science and Technology Organisation

Bulk metallic nickel-silicon carbide nano-particle （Ni-SiCNp） composites, with milling time ranged from 8 to 48 h, were prepared in a planetary ball mill and sintered using a spark plasma sintering （SPS） furnace. The microstructure of the Ni-SiCnp composites was characterized by transmission electron microscopy （TEM） and their mechanical properties were investigated by tensile measurements. The TEM results showed well-dispersed SiCNp particles, either within the matrix, between twins or along grain boundaries （GB）, as well as the presence of stacking faults and twin structures, characteristics of materials with low stacking fault energy. Dislocation lines were also observed to interact with the SiCNp which were plastically nondeformable. A synergistic relationship existed between Hall-Perch strength- ening and dispersion strengthening mechanisms, which was shown to greatly influence the mechanical properties of the Ni-SiCNp composites. Both the maximum yield and tensile strengths were found in the Ni-SiCNp composite with a milling time of 48 h, whereas the increased rate of strengths drastically decreased in material milled above 8 h due to the significant SiCNp agglomeration. The ball milling process resulted in the formation of nano-scale, ultra-fine grained （UFG） Ni-SiCNp composites when the milling time was extended for longer periods, greatly strengthening these materials. The sharp decrease in elongation percentages, however, should be comprehensively considered before irrevers- ible inelastic deformation.

关键词： Ni-SiCNp compositeMechanical alloyingSpark plasma sinteringTransmission electron microscopyTensile testUltra-fine grained (UFG)

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Helium bubble formation and evolution in NiMo-Y_(2)O_(3)alloy under He ion irradiation

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Chinese Physics B 2022年第4期31卷 500-505页

作者： Awen Liu hefei huang Jizhao Liu Zhenbo Zhu Yan Li School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

We report helium ion irradiation experiments for a new type of dispersion-strengthened NiMo-Y_(2)O_(3)alloy with three different irradiation doses and varying irradiation dose rates at 750℃to evaluate its helium-induced damage *** electron microscopy was used to reveal the evolution of helium bubbles after *** experimental results show that with increasing ion dose,the number density of helium bubbles increases ***,the mean size of helium bubbles first increases and then decreases,mainly due to the varied ion dose *** volume fractions of helium bubbles in the three investigated samples after irradiation are 0.15%,0.32%,and 0.27%,which are lower than that of the Hastelloy N alloy(0.58%)after similar irradiation *** indicates that the NiMo-Y_(2)O_(3)alloy exhibits better helium-induced-swelling resistance than the Hastelloy N alloy,highlighting its potential applicability to MSRs,from the perspective of irradiation performance.

关键词： NiMo-Y_(2)O_(3)alloy dose rate helium bubble evolution volume fraction

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Effect of tellurium(Te^(4+))irradiation on microstructure and associated irradiation-induced hardening

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Chinese Physics B 2021年第5期30卷 87-92页

作者： hefei huang Jizhao Liu Guanhong Lei Ondrej Muránsky Tao Wei Mihail Ionescu Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Australian Nuclear Science and Technology Organisation(ANSTO) Lucas HeightsSydneyNSW2234Australia University of New South Wales(UNSW) KensingtonSydneyNSW2052Australia

The GH3535 alloy samples were irradiated using 15-MeV Te^(4+) ions at 650℃to a dose of 0.5,3.0,10,and 20 dpa,*** Te atoms distribution and microstructure evolution were examined by electron probe microanalysis(EPMA)and transmission electron microscopy(TEM).The nano-indenter was then used to measure the nano-hardness changes of samples before and after *** results showed the formation of dislocation loops in the irradiated *** mean diameters increase with the increase of irradiation dose and tends to be saturated when irradiation dose exceeds 10 *** ratio of yield strength increments calculated by dispersed barrier hardening(DBH)model is basically consistent with that of nano-hardness increments measured by *** addition,the relationship between the nano-hardness increments and dpa for the GH3535 alloy irradiated by Te ions has been revealed in the study.

关键词： GH3535 alloy Te ions irradiation microstructural evolution irradiation hardening

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A promising new class of irradiation tolerant materials:Ti_2ZrHfV_(0.5)Mo_(0.2) high-entropy alloy

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Journal of Materials Science & Technology 2019年第3期35卷 369-373页

作者： Yiping Lu hefei huang Xuzhou Gao Cuilan Ren Jie Gao Huanzhi Zhang Shijian Zheng Qianqian Jin Yonghao Zhao Chenyang Lu Tongmin Wang Tingju Li Key Laboratory of Solidification Control and Digital Preparation Technology (Liaoning Province) School of Materials Science and Engineering Dalian University of Technology Shanghai Institute of Applied Physics Chinese Academy of Sciences (CAS) School of Materials Science and Engineering Nanjing University of Science and Technology Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Department of Nuclear Engineering and Radiological Sciences University of Michigan

Recently, high-entropy alloys(HEAs) or multi-principal-element alloys with unprecedented physical,chemical, and mechanical properties, have been considered as candidate materials used in advanced reactors due to their promising irradiation resistant behavior. Here, we report a new single-phase bodycentered cubic(BCC) structured Ti_2 ZrHfV_(0.5)Mo_(0.2) HEA possessing excellent irradiation resistance, i.e.,scarcely irradiation hardening and abnormal lattice constant reduction after helium-ion irradiation,which is completely different from conventional alloys. This is the first time to report the abnormal XRD phenomenon of metallic alloys and almost no hardening after irradiation. These excellent properties make it to be a potential candidate material used as core components in next-generation nuclear reactors. The particular irradiation tolerance derives from high density lattice vacancies/defects.

关键词： High-entropy alloy Irradiation resistance Microstructural characterization Defects evolution

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环境污染强制责任保险实施策略及其影响因素

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经济地理 2024年第3期44卷 138-146页

作者：黄鹤菲米运生华南农业大学经济管理学院广东广州510642

环境污染强制责任保险(即“环强险”)是一种利用市场机制化解突发环境事件风险、防治环境污染的创新型金融措施,对实现经济社会高质量发展具有重要意义。文章运用不完全信息动态博弈模型,分析了政府、企业、保险公司作为决策主体参与环... 详细信息

环境污染强制责任保险(即“环强险”)是一种利用市场机制化解突发环境事件风险、防治环境污染的创新型金融措施,对实现经济社会高质量发展具有重要意义。文章运用不完全信息动态博弈模型,分析了政府、企业、保险公司作为决策主体参与环境污染强制责任保险的最优策略和均衡条件,并以深圳市为例进行了实证分析。研究发现:(1)政府制定的企业责任分担因子与环境事故风险和损失呈负相关,保费与保险公司责任分担因子呈正相关,企业投保概率与企业责任分担因子呈正相关。(2)深圳市作为中国较早一批环境污染强制责任保险试点示范城市,其责任分担因子现在为企业承担较多赔偿责任,而保险公司承担较少赔偿责任。(3)根据模型分析结果可知企业投保意愿有限,这与其环强险实际投保概率仅有50%的情况相吻合。在此基础上,提出政府应适当补贴企业和保险公司,针对高风险高损失的产业,由保险公司承担更多责任,并赋予保险公司监督权限,针对企业制定严格的环保标准和罚款制度,要在促使企业主动投保的同时履行环保义务等对策建议。

关键词：环境污染强制责任保险不完全信息动态博弈模型绿色金融企业与保险公司政府高风险高损害产业环境风险管理

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Efficient three-dimensional characterization of C/C composite reinforced with densely distributed fibers via X-ray phase-contrast microtomography

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Chinese Optics Letters 2021年第7期19卷 99-104页

作者： Ke Li Yantao Gao Haipeng Zhang Guohao Du hefei huang Hongjie Xu Tiqiao Xiao Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Shanghai Synchrotron Radiation Facility/Zhangjiang Lab Shanghai Advanced Research InstituteChinese Academy of SciencesShanghai 201204China University of Chinese Academy of Sciences Beijing 100049China

Carbon fiber(CF)/pyrolytic graphite(PG) composites are promising structural materials for molten salt reactors because of their superior *** to the minor density difference between CF and PG, existing methods are impractical for efficient three-dimensional characterization of CF/PG ***, in this study, a method based on in-line phasecontrast X-ray microtomography was developed to solve the aforementioned *** results demonstrate that the method is suitable for comprehensive characterization of CF/PG *** relationship between the microporous defects and fiber orientations of such composites was also *** findings can be useful for improving the manufacturing process of CF/PG composites.

关键词： X-ray imaging C/C composite 3D characterization

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