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Excellent dynamic yield and spall strength of single crystal NiAlCo alloy under shock compression

Materials science and Engineering: A 2025年 939卷

作者： Pan, X.T. Dong, J.L. Chen, X.M. Luo, B.Q. Shui, R.J. Xu, C. Wu, G. Wang, G.J. Wu, H.A. Tan, F.L. Zhao, J.H. Sun, C.W. CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Hefei230027 China Institute of Fluid Physics China Academy of Engineering Physics Mianyang621999 China Institute of Applied Electronics China Academy of Engineering Physics Mianyang621999 China

A fundamental understanding of the mechanical behaviors and deformation mechanism of materials subjected to dynamic loading is critical for developing outstanding structural materials. This work focuses on the experimental investigation into the dynamic mechanical behaviors, deformation mechanisms, and damage characteristics of single-crystal NiAlCo which was regarded as a potential structure material at high pressure and strain rate. The shock responses of the single-crystal NiAlCo alloy were tested over a range of shock pressure from 10 to 50 GPa at a strain rate of 105/s utilizing the technique of magnetically driven high-velocity flyer plates on high pulsed power generator CQ-4. Based on the analyses of free surface velocity profiles, a linear Hugoniot relationship between shock wave speed and particle velocity was obtained, and the spall strength gradually increased from 2.61 GPa to 6.98 GPa with increasing shock pressure. The yield strength was calculated from the Hugoniot elastic limit, and it reaches 1.80 GPa over the wide range of shock pressure. Further, the relationship between dynamic strength and strain rate was depicted by empirical formulas in power exponential form. Finally, the detailed transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) microscopic characterization results of recovered samples disclose that single-crystal NiAlCo have abundant micro-deformation mechanisms under high pressure and high strain rate, including dislocation tangle, high-density stacking faults, and Lomer-Cottrell locks. The results show that both spall and yield strength are significantly higher than those of most alloys, exhibiting superior mechanical properties, which may be attributed to the coupling of multiple deformation mechanisms. © 2025 Elsevier B.V.

关键词： Strain rate

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Carbon emission peaks in countries worldwide and their national drivers

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Carbon Research 2025年第1期4卷 1-16页

作者： Wu, Qian Chen, Yujie Huang, Chaoqing Zhang, Lu He, Chao School of Resource and Environmental Sciences Wuhan University Wuhan China Collaborative Innovation Center for Emissions Trading System Co-Constructed By the Province and Ministry Wuhan China Key Laboratory of Geographic Information System Ministry of Education Wuhan University Wuhan China School of Electronic Information and Communications Huazhong University of Science and Technology Wuhan China Guangdong Eco-Engineering Polytechnic Guangdong Province Guangzhou China State Key Laboratory of Freshwater Ecology and Biotechnology Institute of Hydrobiology Chinese Academy of Sciences Wuhan China National Science Library (Wuhan) Chinese Academy of Sciences Wuhan China

Estimating the characteristics of CO2 emission peaks through decoupling relationships is crucial for understanding global CO2 emissions and mitigating climate change. This study investigated the spatiotemporal patterns and primary sources of global CO2 emissions from 1990 to 2020. Using the Mann–Kendall test and decoupling index, we identified emission peak characteristics across countries worldwide. Furthermore, the geographically temporally weighted regression (GTWR) model was employed to examine the effects of various factors on CO2 emissions. The results indicate that global CO2 emissions increased steadily over the study period, with the power industry contributing the most (34.54%–38.62%). Countries were categorized into four groups: no-declined, plateau, passively emission declined, and proactively peaked, comprising 99, 48, 20, and 26 countries, respectively. Notably, 65.4% of proactively peaked countries were developed nations, while 65% of passively emission declined countries were developing nations. CO2 emissions exhibited positive correlations with carbon intensity, GDP per capita, and the secondary industry but negative correlations with population density, the primary and tertiary industries. These findings provide valuable insights into global CO2 emission dynamics, highlighting emission peaks and decoupling relationships. This study also offers robust scientific support for policymakers to effectively design tailored strategies for reducing carbon emissions.

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Experimental study on aerosol behavior in water pool scrubbing under severe accident conditions

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International Journal of Advanced Nuclear reactor design and technology 2020年 2卷 111-116页

作者： Xu, Youyou Deng, Jian Zou, Zhiqiang Jiang, Guangming Wu, Xiaoli Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

In severe accident of nuclear power plant, large quantities of steam and radioactive aerosol may release to the containment. Meanwhile, hydrogen may be generated by zirconium-steam reaction and released to the containment and mixed with steam and air to form a flammable mixture (H2, H2O, Air) which might combust even explode to generate mechanical and thermal load on containment. In this situation, timely containment venting strategies (CVS) is an important and effective measure to release the containment atmosphere to decrease the pressure. In order to remove the radioactive aerosol particles and cool the high temperature mixture, the containment atmosphere are vented to the water pool. This paper mainly investigated the behavior of aerosol scrubbing in water pool. The effects of submergence depth, aerosol particle diameter and aerosol concentration were preliminary studied by conducting a series of experiments. The results illustrate that the scrubbing efficiency of gas jet injection into water pool almost larger than 90%. And the aerosol particle diameter and submergence depth have significant influence on decontamination factor (DF). This paper provide data basis and reference to the subsequent work. © 2020

关键词： Aerosols

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Research on the domestic materials of forging Z12CN13 stainless steel for Hold-Down Spring of reactor

Research on the domestic materials of forging Z12CN13 stainl...

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Energy Materials 2014

作者： Li, Ning Ying, Luo Xin, Xia Hua, Du National Key Laboratory of Science and Technology on Reactor System Design Technology Chengdu610041 China

ISBN: (纸本)9781119027942

Effects of main alloying elements, quenching and tempering temperatures and quenching cooling velocity on mechanical properties of Z12CN13 stainless steel were obtained by controlling the material composition and optimizing the heat treatments. Evaluation of domestic forging Z12CN13 stainless steel for Hold-Down Spring of reactor had been completed, and all parameters met the requirement of design criteria national standard. The main alloying elements should be selected from upper limits to reach the technical standards of the strength and toughness properties. The strength, plasticity and toughness properties of domestic forging Z12CN13 stainless steel will decrease with increasing the quenching temperature. On the contrary, the strength decreases, plasticity and the toughness properties will increase with the increasing of tempering temperature. The tensile strength and impact toughness of materials are influenced obviously with the quenching cooling velocity. Improving the cooling velocity could meet the technical standards of the strength and toughness properties. The comprehensive mechanical properties and combination of strength and toughness is the best when the domestic forging Z12CN13 stainless steel is quenched at 985°C and then cooling fast and aged at 640°C.

关键词： Stainless steel

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Research of SSAE-GPC in Coordinated Control system of Nuclear Power Plant 5th

Research of SSAE-GPC in Coordinated Control System of Nuclea...

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5th International Symposium on Software Reliability, Industrial Safety, Cyber Security and Physical Protection of Nuclear Power Plant, ISNPP 2020

作者： Deng, Zhi-Guang Wu, Qian Zhu, Bi-Wei Lv, Xin Zhu, Jia-Liang Xu, Si-Jie Wang, Xue-Mei National Key Laboratory of Science and Technology on Reactor System Design Technology Chengdu610213 China

ISBN: (纸本)9789811634550

For the problem of poor control effect of conventional PID controllers in complex systems, this paper fully combines the advantages of deep learning in feature extraction, regression prediction, and predictive control in dealing with multivariable, strong coupling and other issues. Firstly, the predictive model controller is constructed through the stacked sparse auto-encoder (SSAE) deep network, and then the stepped generalized predictive control (SGPC) is used as the rolling optimization controller. Thus, the SSAE-SGPC neural network predictive controller is built. Finally, a simulation experiment is carried out in the dual-input dual-output multi-variable coordinated control system of nuclear power plant. Through a series of simulations such as set value disturbance, internal disturbance and external disturbance, compared with conventional PID control, SSAE-GPC controller has better control effect. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Controllers

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Decoherence-protected holonomic gates with reduced requirements for physical resources

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Physical Review Applied 2025年第4期23卷 044016-044016页

作者： Chunfeng Wu Chunfang Sun Jiangang Ma Ding Huang Xun-Li Feng L.C. Kwek Science Mathematics and Technology Singapore University of Technology and Design 8 Somapah Road Singapore 487372 Singapore School of Physics Northeast Normal University Changchun 130024 China Center for Quantum Sciences Northeast Normal University Changchun 130024 China Key Laboratory of UV-Emitting Materials and Technology Ministry of Education Northeast Normal University Changchun 130024 China Quantum Innovation Centre (Q.InC) Agency for Science Technology and Research (ASTAR) 2 Fusionopolis Way Innovis #08-03 Singapore 138634 Republic of Singapore Institute of Materials Research and Engineering (IMRE) Agency for Science Technology and Research (ASTAR) 2 Fusionopolis Way Innovis #08-03 Singapore 138634 Republic of Singapore Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore 117543 Singapore National Institute of Education Nanyang Technological University 1 Nanyang Walk Singapore 637616 Singapore

We study the implementation of holonomic quantum gates preserved from arbitrary single-qubit and two-qubit decoherence or errors using a dynamical decoupling approach. To integrate the holonomic feature with the dynamical decoupling technique, we require only one auxiliary qubit for single-qubit gates and no auxiliary qubit for two-qubit gates. Our scheme uses far fewer physical qubits to achieve this integration compared to existing proposals in the literature. Moreover, the scheme is based on system interactions that can be experimentally realized with superconducting qubits. These advantages suggest that our scheme is a promising step toward developing noise-resistant quantum devices.

关键词： Qubits

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Ratcheting Behavior of SA508-3 Steel at Elevated Temperature:Experimental Observation and Simulation

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Acta Metallurgica Sinica(English Letters) 2017年第9期30卷 822-828页

作者： Jun Tian Yu Yang Li-Ping Zhang Xue-Jiao Shao Juan Du Qian-Hua Kan Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong University

A series of monotonic uniaxial tensile tests, strain-controlled and stress-controlled cyclic tests of SA508-3 steel were conducted from 25 to 350℃. Results showed that the steel exhibited temperature-dependent cyclic softening characteristic and obvious ratcheting behavior, and dynamic strain aging was observed in the range of 250-350℃. Based on experimental observations, a temperature-dependent cyclic plastic constitutive model was proposed by introducing the nonlinear cyclic softening and kinematic hardening rules, and the dynamic strain aging was also considered into the constitutive model. Comparisons between experiments and simulations were carded out to validate the proposed model at elevated temperature.

关键词： Ratcheting Constitutive model Dynamic strain aging Cyclic loading Elevated temperature

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Research of Advanced Control Algorithm in Primary Loop Control system 5th

Research of Advanced Control Algorithm in Primary Loop Contr...

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5th International Symposium on Software Reliability, Industrial Safety, Cyber Security and Physical Protection of Nuclear Power Plant, ISNPP 2020

作者： Deng, Zhi-Guang Zhu, Bi-Wei Wu, Qian He, Peng Xiang, Mei-Qiong Xu, Tao Qing, Yue National Key Laboratory of Science and Technology on Reactor System Design Technology Chengdu610213 China

ISBN: (纸本)9789811634550

The primary loop system of nuclear power plant is a large-scale control system with serious coupling between loops and complex objects. In order to solve the problem of integrated control of primary loop core power, stabilizer pressure and water level, and steam generator water level, this paper applies improved predictive control algorithms to each sub-control system on the basis of mechanism modeling. For the strong non-linear problem of water level control, a multi-model predictive controller is constructed through linearization at each typical operating point. The simulation results show that the application of advanced predictive control algorithm to the primary loop control system has achieved good control performance, and it also lays a solid foundation for subsequent practical engineering applications. © 2021, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Water levels

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Assessment of Coupled Effect of Steam Pipes on Seismic Analysis of reactor Coolant system 7

Assessment of Coupled Effect of Steam Pipes on Seismic Analy...

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7th International Conference on Environmental science and Civil Engineering, ESCE 2021

作者： Li, Lijuan Liu, Zhenyu Li, Hui Ye, Xianhui Ai, Honglei National Key Laboratory of Science and Technology on Reactor System Design Technology Chengdu Sichuan China

reactor coolant system is connected with auxiliary pipes, surge pipes and steam pipes. In order to facilitate the dynamic analysis of reactor coolant system, it is necessary to decouple the pipes connected with the reactor coolant system. Although some international standards stipulating requirements for the decoupling of subsystems from the main system, in order to further explore the influence of decoupling steam pipes, the seismic response of reactor coolant system with or without steam pipes is simulated by using ANSYS program. Firstly, the modal analysis of reactor coolant system is carried out to analysis the influence of steam pipes on the resonant frequency of reactor system. Then, the standardized seismic dynamic analysis of reactor system with or without steam pipes is carried out. The nozzle load (inlet and outlet nozzle load of main device, such as reactor pressure vessel, steam generator, pump) and support load (of main device such as reactor pressure vessel, steam generator, pump) are output and compared. According to nozzle load and support load, it can be seen that the steam pipes have little influence on the seismic analysis of reactor coolant system, i.e. steam pipes can be decoupled in the seismic analysis of reactor coolant system. © Published under licence by IOP Publishing Ltd.

关键词： Steam generators

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Effect of grain size on gas bubble evolution in nuclear fuel:Phase-field investigations

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Chinese Physics B 2024年第1期33卷 563-572页

作者：孙丹杨青峰赵家珺高士鑫辛勇周毅尹春雨陈平赵纪军王园园 Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of ChinaChengdu 610213China Key Laboratory of Materials Modification by Laser Ionand Electron BeamsDalian University of TechnologyDalian 116024China

Numerous irradiation-induced gas bubbles are created in the nuclear fuel during irradiation, leading to the change of microstructure and the degradation of mechanical and thermal properties. The grain size of fuel is one of the important factors affecting bubble evolution. In current study, we first predict the thermodynamic behaviors of point defects as well as the interplay between vacancy and gas atom in both UO_(2) and U_(3)Si_(2) according to ab initio approach. Then, we establish the irradiation-induced bubble phase-field model to investigate the formation and evolution of intra-and inter-granular gas bubbles. The effects of fission rate and temperature on the evolutions of bubble morphologies in UO_(2) and U_(3)Si_(2) have been revealed. Especially, a comparison of porosities under different grain sizes is examined and analyzed. To understand the thermal conductivity as functions of grain size and porosity, the heat transfer capability of U_(3)Si_(2) is evaluated.

关键词： grain size point defects fission gas bubble

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