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Tungsten 2024年第1期6卷 134-140页

作者： Lin-Chao Zhang Ke Jing Rui Liu Zhuo-Ming Xie Jun-Feng Yang Gang Li xian-ping wang Xue-Bang Wu Qian-Feng Fang Chang-Song Liu Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China

The cermet fuels have been considered as a potential key component for the nuclear thermal propulsion,and the homogeneity of the fuel particles in the metal matrix plays a crucial role in stabilizing the structure at extremely high temperatures.In this work,liquid paraffin was used as additive to improve the distribution of yttria-stabilized zirconia(YSZ,an appropriate surrogate for UO_(2) fuel)microspheres in the tungsten(W)matrix,and the W-YSZ cermet wafers(volume ratio 1:1)with a relative density of 97.6%were fabricated by spark plasma sintering with a specifically designed program.The effects of the paraffin dosage(0-5 wt.%)on the homogeneity,microstructure,mechanical properties,and the thermal conductivity of W-YSZ cermet were investigated.The W-YSZ sample with 2 wt.%paraffin shows the highest homogeneity and exhibits the best comprehensive properties,including the ultimate tensile strength of 132.2 MPa at 600℃,the bending strength of455 MPa and thermal conductivity of 50 W·m^(-1)·K^(-1)at room temperature.Moreover,the cermet could keep structurally sound after thermal shocked at a heat load of 20 MW·m^(-2).These results would be helpful for the design and optimization of the cermet fuels in the nuclear thermal propulsion.

关键词： Nuclear thermal propulsion Tungsten Cermet Liquid paraffin Thermal shock

Achieving a remarkable low-temperature tensile ductility in a high-strength tungsten alloy

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Tungsten 2024年第1期6卷 150-161页

作者： xiang Cheng Zhuo-Ming Xie Xue-Feng Xie Long-Fei Zeng Rui Liu Jun-Feng Yang Xue-Bang Wu xian-ping wang Chang-Song Liu Qiang-Feng Fang Key Laboratory of Materials Physics Institute of Solid State PhysicsHFIPSChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Faculty of Materials Metallurgy and Chemistry Jiangxi University of Science and TechnologyGanzhou 341000China

Hot-swaging yields a high ultimate tensile strength of 712 MPa but a limited tensile ductility with the total elongation of3.6%at a testing temperature of 200℃in a representative W-0.5wt.%ZrC alloy.In this work,the evolution of Vickers microhardness with annealing temperatures is investigated in detail,which contributes to a rough index chart to guide the search for an optimized post-annealing temperature.Through the post-annealing around 1300℃,an outstanding tensile ductility at200℃,including a uniform elongation of 14%and a total elongation of~25%,has been achieved without the sacrifice of its strength.The evolution of dislocations and grain structures with the annealing temperatures accessed through backscattered scanning electron microscope and transmission electron microscope analysis reveals that the improved low-temperature tensile ductility has resulted from the reduction of residual dislocations and dislocation tanglement via the static recovery,which provides more room to accommodate dislocations,and hence stronger strain hardening ability and tensile ductility.

关键词： Tungsten Low-temperature ductility Annealing Dislocations

Phase Transition and Oxygen Ion Diffusion in （La1-xLnx）2Mo2O9 （Ln=Nd, Gd, x=0.05-0.25） Using Dielectric Relaxation Method

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Chinese Journal of Chemical Physics 2008年第3期21卷 270-274页

作者： Qian-feng Fang Zhong Zhuang xian-ping wang Dan Li Jian-xin wang Ningbo Institute of Material Technology and Engineering Chinese Academy of Sciences Ningbo315040 China Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of SciencesHefei 230031 China

绝缘的松驰方法被采用在氧化物离子售票员(La1xLnx ) 学习氧离子散开和阶段转变的性质 2Mo2O9 (行 = Nd， Gd， x = 0.05-0.25 ) 。二座绝缘的损失山峰被观察：在在 720 K 附近的大约 600 K 和山峰 Ph 的山峰 Pd。山峰 Pd 是一座 relaxa... 详细信息

绝缘的松驰方法被采用在氧化物离子售票员(La1xLnx ) 学习氧离子散开和阶段转变的性质 2Mo2O9 (行 = Nd， Gd， x = 0.05-0.25 ) 。二座绝缘的损失山峰被观察：在在 720 K 附近的大约 600 K 和山峰 Ph 的山峰 Pd。山峰 Pd 是一座 relaxational 山峰并且与联系短期氧离子的散开当山峰 Ph 几乎不改变它的位置并且戏剧性地与增加频率在高度减少时，展出 non-relaxational 自然。与增加 Ln3+ 集中，山峰 Ph 和 Pd 的高度起初增加然后在在 15% 做传递最大值以后减少。山峰 Ph 与到在氧离子 / 空缺分发的一个动态混乱状态的一个静态的混乱状态的阶段转变有关，这被建议。15%Gd 或 15%Nd 做了 La2Mo2O9 样品，这被发现在这个做的内容根据山峰 Pd 的最高的高度展出最高的传导性。

关键词：氧离子导体 La2Mo2O9 介电驰豫氧离子扩散

Electrical properties of garnet-like lithium ionic conductors Li5＋xSrxLa3-xBi2O12 fabricated by spark plasma sintering method

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Frontiers of Materials Science 2012年第3期6卷 216-224页

作者： Yun-Xia GAO xian-ping wang Qin-Xing SUN Zhong ZHUANG Qian-Feng FANG Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China

A typical approach involving Pechini method and spark plasma sintering （SPS） method was presented for the preparation of high density Li5＋xSrxLa3_xBi2012 （x = 0, 1） ceramics. Phase formation, microstructure, grain size and electrical properties of the specimens were examined using XRD, SEM and alternating current impedance spectro- scopy （ACIS）. Dense LisLa3Bi2012 and LisSrLa2Bi2012 ceramics with pure garnet-like phase, relative density of 97% and average grain size of about 5 pm were fabricated using this approach. The total conductivities at 298 K of Li5La3Bi2012 and LisSrLa2Bi2O12 ceramics prepared by the SPS method are 5.1 Qian-Feng FANG105 and 6.810SS/cm, respectively, 2 times higher than that of samples prepared by the conventional sintering method.

关键词： lithium ionic conductor Lis.xSrxLa3_xBi2012 Pechini method spark plasmasintering （SPS） ionic conductivity

Hot rolling and annealing effects on the microstructure and mechanical properties of ODS austenitic steel fabricated by electron beam selective melting

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Frontiers of Materials Science 2016年第1期10卷 73-79页

作者： Rui GAO Wen-jun GE Shu MIAO Tao ZHANG xian-ping wang Qian-feng FANG Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China

The grain morphology, nano-oxide particles and mechanical properties of oxide dispersion strengthened （ODS）-316L austenitic steel synthesized by electron beam selective melting （EBSM） technique with different post-working processes, were explored in this study. The ODS-316L austenitic steel with superfine nano-sized oxide particles of 30-40 nm exhibits good tensile strength （412 MPa） and large total elongation （about 51%） due to the pinning effect of uniform distributed oxide particles on dislocations. After hot rolling, the specimen exhibits a higher tensile strength of 482 MPa, but the elongation decreases to 31.8% owing to the introduction of high-density dislocations. The subsequent heat treatment eliminates the grain defects induced by hot rolling and increases the randomly orientated grains, which further improves the strength and ductility of EBSM ODS-316L steel.

关键词： electron beam selective melting ODS.316L steel powder hot rolling microstructure tensile strength

Enhanced micro-vibration sensitive high-damping capacity and mechanical strength achieved in AI matrix composites reinforced with garnet-like lithium electrolyte

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Frontiers of Materials Science 2017年第1期11卷 75-81页

作者： xian-ping wang YiZHANG Yu XIA Wei-Bing JIANG Hui LIU wang LIU Yun-Xia GAO Tao ZHANG Qian-Feng FANG Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China School of Chemistry and Materials Science University of Science and Technology of China Hefei 230026 China

A novel micro-vibration sensitive-type high-damping AI matrix composites reinforced with Li7-xLa3Zr2-xNbxO12 （LLZNO, x = 0.25） was designed and prepared using an advanced spark plasma sintering （SPS） technique. The damping capacity and mechanical properties of LLZNO/AI composites （LLZNO content： 0-40 wt.%） were found to be greatly improved by the LLZNO addition. The maximum damping capacity and the ultimate tensile strength （UTS） of LLZNO/AI composite can be respectively up to 0.033 and 101.2 MPa in the case of 20 wt.% LLZNO addition. The enhancement of damping and mechanical properties of the composites was ascribed to the intrinsic high-damping capacity and strengthening effects of hard LLZNO particulate. This investigation provides a new insight to sensitively suppress micro-vibration of payloads in the aerospace environment.

关键词： high-damping materials micro-vibration sensitivity LLZNO/AI metalmatrix composites mechanical property

Internal friction study of ambient aging behaviors of irradiated tungsten by Si/H ions

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Frontiers of Materials Science 2013年第1期7卷 91-95页

作者： Jing HU xian-ping wang Qian-Feng FANG Zi-Qiang ZHAO Yan-Wen ZHANG Chang-Song LIU Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China

The aging behaviors of irradiated tungsten by high energy Si3+ and H+ ions are mainly investigated using internal friction (IF) method combined with SEM technology. The SEM analysis indicates that more severe irradiation damage appears in the surface of simultaneous dual Si3+ + H+ irradiated specimen than that in the sequential dual Si3+ + H+ irradiated specimen or the single Si3+ irradiated specimens because of the synergistic effect of Si and H irradiation. The IF background of the irradiated sample is about one order of magnitude higher than that of the unirradiated sample owing to the existence of high density fresh dislocations induced by Si/H irradiation. In the sequential dual Si3+ and H+ irradiated specimen, the hydrogen Snoek-Kê-Köster (SKK) peak associated with the movement of dislocations dragging hydrogen atoms is observed and its height decreases with aging time at room temperature. As for the simultaneous dual Si3+ + H+ irradiated specimen, however, there is no such hydrogen SKK peak. The reason can be explained as hydrogen diffusion and pinning effect of dislocations.

关键词： tungsten irradiation damage internal friction hydrogen-dislocation interaction

Preparation and enhancement of ionic conductivity in AI-added garnet-like Li6.8La3Zr1.8Bi0.2O12 lithium ionic electrolyte

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Frontiers of Materials Science 2015年第4期9卷 366-372页

作者： Yu XIA Liang MA Hui LU xian-ping wang Yun-Xia GAO wang LIU Zong ZHUANG Li-Jun GUO Qian-Feng FANG Key Laboratory of Materials Physics Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China

Garnet-like Li6.8La3Zr1.8Bi0.2O12 （LLZBO）＋ x mol.% Al2O3 （x = 0, 1.25, 2.50） lithium ionic electrolytes were prepared by conventional solid state reaction method under two different sintering temperatures of 1000℃ and 1100℃. XPS, induced coupled plasma optical emission spectrometer （ICP-OES）, XRD and AC impedance spectroscopy were applied to investigate the bismuth valance, lithium concentration, phase structure and lithium ionic conductivity, respectively. Electrical measurement demonstrated that ionic conductivity of AI-added LLZBO compounds could be obviously improved when the sample sintering temperature increased from 1000℃ to 1100℃. The highest ionic conductivity 6.3×10-S/cm was obtained in the LLZBO-1.25%AI sample sintered at 1100℃, in consistent with the lowest activation energy 0.45eV for the lithium ion migration. The mechanism related with good ionic conductivity in the AI-added LLZBO sample was attributed to the lattice distortion induced by the partial AI substitution at Zr sites, which is helpful to improve the migration ability of Li ions in lattice.

关键词： garnet lithium electrolyte cubic Li7La3Zr2O12 AC impedance ionicconductivity activation energy

Interaction of radiation-induced defects with tungsten grain boundaries at across scales: a short review

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Tungsten 2020年第1期2卷 15-33页

作者： xiang‑Yan Li Yan‑Ge Zhang Yi‑Chun Xu Xue‑Bang Wu xiang‑Shan Kong xian‑ping wang Qian‑Feng Fang Chang‑Song Liu Key Laboratory of Materials Physics Institute of Solid State PhysicsChinese Academy of SciencesHefei 230031China Key Laboratory for Liquid‑Solid Structural Evolution and Processing of Materials(Ministry of Education) Shandong UniversityJinan 250061China

As promising candidates for plasma-facing materials,tungsten-based materials suffer the irradiation of high-energy neutrons in addition to the hydrogen isotopes and helium irradiation and the high-thermal flux.Radiation-produced defects,e.***.self-interstitial atoms(SIAs)and vacancies(Vs),can induce the hardening and embrittlement of tungsten,meanwhile enhancing the retention of hydrogen isotopes and helium in tungsten.Reducing the grain size of materials to introduce a high density of defect sinks,e.g.,grain boundaries(GBs)prevalent in nano-/ultrafine-crystalline materials,was demonstrated to be an effective approach for mitigating irradiation damage in tungsten.In this paper,we reviewed the theoretical advances in exploring radiation-resistance of nano-structured tungsten at across scales.It was concentrated on the results of molecular dynamics,molecular statics,and the object kinetic Monte Carlo simulations on the fundamental interaction of the radiation-created Vs and SIAs with the GB.These mechanisms include GB-promoted V/SIA migration and SIA-V recombination,interstitial-emission induced annihilation,coupling of the V migration close to the GB with the SIA motion within the GB,and interstitial reflection by the locally dense GB structure.We proposed the remaining scientific issues on the defect-GB interactions at across scales and their relation to experimental observations.We prospected the possible trends for simulating the radiation damage accumulation and healing processes in nano-structured tungsten in terms of the development of the across-scale computational techniques and efficiency of the GB-enhanced tolerance of tungsten to irradiation under complex in-service conditions.

关键词： Nano-crystalline Grain boundary Radiation-resistance Self-healing Radiation damage Tungsten

Carbon steel anticorrosion performance and mechanism of sodium lignosulfonate

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Rare Metals 2024年第1期43卷 356-365页

作者： Bo-Kai Liao Rui-Xuan Quan ping-xian Feng Huan wang Wei wang Li Niu School of Chemistry and Chemical Engineering Guangzhou Key Laboratory of Sensing Materials and DevicesJoint Institute of Guangzhou University and Institute of Corrosion Science and TechnologyGuangzhou UniversityGuangzhou 510006China

Lignin is a typical biological macromolecule with a three-dimensional network structure and abundant functional groups. It has excellent ionic complexation ability and amphiphilic molecular structure characteristics.In this study, the carbon steel anticorrosion performance of sodium lignosulfonate(SLS) in an acid solution was evaluated using the weight loss method, electrochemical measurements, scanning vibration electrode technique(SVET), and surface characterization methods. SLS exhibited excellent corrosion inhibition efficiency for Q235carbon steel in 1 mol·L^(-1) HCl, reaching a maximum value of 98%. A low SLS concentration of 20 mg·L^(-1) resulted in the maximum corrosion inhibition efficiency, which remained nearly constant at higher SLS concentrations.The SVET test demonstrated that the formation of an SLS adsorption film can impede corrosion. This study confirms the significance of the application of green biomass resources in the field of metal corrosion protection and green functional materials.

关键词： Lignin Sodium lignosulfonate Corrosion inhibitor Carbon Steel