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Microstructural landscape of amorphous carbon

National science Review 2024年第5期11卷 94-95页

作者： Huiyang Gou Center for High Pressure Science and Technology Advanced Research (HPSTAR)

Due to its diverse bonding hybridization forms (sp, sp2and sp3), amorphous carbon exhibits multifaceted properties and important application prospects, which have aroused extensive research interest[1–5]. In amorphous solids, some degree of atomic short-to medium-range order is thought to be ubiquitous, and the recent synthesis of new amorphous carbon has further increased our understanding of the atomic disorder in materials [4].

关键词： landscape amorphous carbon microstructural

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Simultaneous measurement of thermal conductivity, heat capacity, and interfacial thermal conductance by leveraging negative delay-time data in time-domain thermoreflectance

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Progress in Natural science:Materials International 2025年第2期35卷 375-384页

作者： Mingzhen Zhang Tao Chen Ao Zeng Jialin Tang Ruiqiang Guo Puqing Jiang School of Energy and Power Engineering Huazhong University of Science and Technology Thermal Science Research Center Shandong Institute of Advanced Technology Institute of Advanced Technology Shandong University

Time-domain thermoreflectance（TDTR） is a widely used technique for characterizing the thermal properties of bulk and thin-film materials. Traditional TDTR analyses typically focus on positive delay time data for fitting,often requiring multiple-frequency measurements to simultaneously determine thermal conductivity and heat capacity. However, this multiple-frequency approach is cumbersome and may introduce potential errors due to practical challenges to ensure consistent measurements across different frequencies. In this study, we propose a novel solution to these challenges by harnessing the underexplored negative delay time data in TDTR. By integrating these data points, we offer a streamlined, single-frequency method that simultaneously measures thermal conductivity, heat capacity, and interfacial thermal conductance for both bulk and thin-film materials, enhancing measurement efficiency and accuracy. We demonstrate the effectiveness of this method by measuring several bulk samples including sapphire, silicon, diamond, and Si0.992Ge0.008, and several thin-film samples including a 1.76-μm-thick gallium nitride（Ga N） film epitaxially grown on a silicon substrate, a 320-nm-thick gallium oxide（ε-Ga2O3） film epitaxially grown on a silicon carbide substrate, and a 330-nm-thick tantalum nitride（Ta N） film deposited on a sapphire substrate, all coated with an aluminum（Al） transducer layer on the surface. Our results show that the new method accurately determines the thermal conductivity and heat capacity of these samples as well as the Al/sample interfacial thermal conductance using a single modulation frequency, except for the Si0.992Ge0.008sample. This study sheds light on the untapped potential of TDTR, offering a new, efficient, and accurate avenue for thermal analysis in material science.

关键词： Heat capacity Negative delay time TDTR Thermal conductivity Time-domain thermoreflectance

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Microstructure evolution and strengthening mechanism of high -performance powder metallurgy TA15 titanium alloy by hot rolling

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International Journal of Minerals,Metallurgy and Materials 2024年第6期31卷 1426-1436页

作者： Ying Gao Ce Zhang Jiazhen Zhang Xin Lu Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advanced Metals and MaterialsInstitute for Advanced Ma-terials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China National Engineering Research Center for Advanced Rolling Technology National Engineering Research Center for Flat Rolling EquipmentInstitute of Engin-eering TechnologyUniversity of Science and Technology BeijingBeijing 100083China

Hot deformation of sintered billets by powder metallurgy(PM)is an effective preparation technique for titanium alloys,which is more significant for high-alloying *** this study,Ti–6.5Al–2Zr–Mo–V(TA15)titanium alloy plates were prepared by cold press-ing sintering combined with high-temperature hot *** microstructure and mechanical properties under different process paramet-ers were *** microscope,electron backscatter diffraction,and others were applied to characterize the microstructure evolution and mechanical properties strengthening *** results showed that the chemical compositions were uniformly dif-fused without segregation during sintering,and the closing of the matrix craters was accelerated by increasing the sintering *** block was hot rolled at 1200℃ with an 80%reduction under only two passes without *** strength and elongation of the plate at 20–25℃ after solution and aging were 1247 MPa and 14.0%,respectively,which were increased by 24.5%and 40.0%,respect-ively,compared with the as-sintered alloy at 1300℃.The microstructure was significantly refined by continuous dynamic recrystalliza-tion,which was completed by the rotation and dislocation absorption of the substructure surrounded by low-angle grain *** hot rolling combined with heat treatment,the strength and plasticity of PM-TA15 were significantly improved,which resulted from the dense,uniform,and fine recrystallization structure and the synergistic effect of multiple slip systems.

关键词： elemental powder powder metallurgy titanium alloy hot rolling strength and plasticity

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Non-coordinating charge transfer enables ultrafast desolvation of hydrated zinc ions in the outer Helmholtz layer for stable aqueous Zn metal batteries

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National science Review 2025年第4期12卷 282-293页

作者： Xiuli Guo Qiaoling Peng Rui Yang Gengyou Cao Jianfeng Wen Kyungsoo Shin Ye Zheng Sarayut Tunmee Caineng Zou Yongping Zheng Xiaolong Zhou Yongbing Tang Advanced Energy Storage Technology Research Center Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Nano Science and Technology Institute University of Science and Technology of China Shenzhen College of Advanced Technology University of Chinese Academy of Sciences Synchrotron Light Research Institute (Public Organization) Petro China Shenzhen New Eergy Research Institute Co. LTD.

The formation of a strong coordination structure,[Zn（H2O）6]2+often increases direct contact between the solvated H2O and Zn anodes in the inner Helmholtz layer,which exacerbates undesirable side reactions and dendrite growth,hindering the practical application of aqueous Zn metal ***,we show that the solvated H2O can be effectively minimized by an artificial solid electrolyte interphase（SEI） consisting of highly nitrogen-doped amorphous carbon（NC） and perfluorosulfonic acid polymer（Nafion）.Theoretical and experimental analyses reveal that NC raises the Fermi level of the composite SEI and activates the non-coordinating charge transfer from the SEI to [Zn（H2O）6]2+,which leads to ultrafast desolvation of hydrated Zn-ions in the outer Helmholtz layer;while the Nafion framework ensures selective transport channels for Zn ***,the derived NC-Nafion@Zn symmetric cell exhibits a long lifespan(3400 h,1 mA cm-2;2000 h,5 mA cm-2);moreover,the NC-Nafion@Zn//Mn4O3-carbon nano tubes full battery delivers ultralong cycling stability of 9300 cycles at 2 A g-1with a high retention of 91.3%.

关键词： Fermi-level engineering non-coordinating charge transfer fast desolvation nitrogen-doped amorphous carbon aqueous Zn metal batteries

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Effect of post rolling stress on phase transformation behavior of microalloyed dual phase steel

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Journal of Iron and Steel research International 2024年第3期31卷 688-699页

作者： Wen-quan Sun Sheng-yi Yong Tie-heng Yuan Ting-song Yang An-rui He Chao Liu Rui-chun Guo National Engineering Research Center for Advanced Rolling and Intelligent Manufacturing University of Science and Technology BeijingBeijing 100083China

The slow phase transformation of microalloyed dual phase steel makes the nonuniform stress and temperature fields during the post rolling cooling process have a significant impact on the phase transformation *** the relatively slow phase transformation of DP780 steel within the microalloyed dual phase steel series,the influence of stress on the phase transformation behavior of DP780 steel was *** quantify the nonuniform thermal and stress conditions in the steel coil,a thermo-mechanical coupled finite element model of the hot-rolled strip cooling process was *** on the simulation data,DP780 steel was chosen as the research material,and Gleeble 3500 thermal simulation equipment was used for experimental *** thermal expansion curves were analyzed through regression to establish the dynamic model of DP780 steel phase transformation under ***,metallographic analysis was conducted to determine phase transformation type and grain size of DP780 *** results confirmed that the stress promotes the occurrence of semi-diffusion-type bainite ***,an appropriate level of stress facilitates the growth of bainitic grains,while the increased stress inhibits the growth of ferritic grains.

关键词： Microalloyed dual phase steel Stress Bainitic transformation Grain Finite element method

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Unveiling of Terahertz Emission from Ultrafast Demagnetization and the Anomalous Hall Effect in a Single Ferromagnetic Film

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Chinese Physics Letters 2024年第4期41卷 45-50页

作者：蓝志强李章顺徐浩然刘凡金钻明彭滟朱亦鸣 Terahertz Technology Innovation Research Institute Terahertz Spectrum and Imaging Technology Cooperative Innovation CenterShanghai Key Lab of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

Using THz emission spectroscopy,we investigate the elementary spin dynamics in ferromagnetic single-layer Fe on a sub-picosecond *** demonstrate that THz radiation changes its polarity with reversal of the magnetization applied by the external magnetic *** addition,it is found that the sign of THz polarity excited from different sides is defined by the thickness of the Fe layer and Fe/dielectric *** on the thickness and symmetry dependences of THz emission,we experimentally distinguish between the two major contributions:ultrafast demagnetization and the anomalous Hall *** experimental results not only enrich understanding of THz electromagnetic generation induced by femtosecond laser pulses but also provide a practical way to access laser-induced ultrafast spin dynamics in magnetic structures.

关键词： magnetic magnetization polarity

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Developing and Validating Japanese Versions of Psychological Safety Scale, Knowledge Sharing Scale and Expressed Humility Scale

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Management and Labour Studies 2024年第3期49卷 375-388页

作者： Matsuo, Akiko Tsujita, Masaki Kita, Kotoko Ayaya, Satsuki Kumagaya, Shin-Ichiro Research Center for Advanced Science and Technology The University of Tokyo Japan

Organizational research has increased in the contemporary, digitalized and global society. Mainly researchers in Western countries conducted empirical, organizational research in the past. These studies have investigated combinations of psychological safety, knowledge sharing and leaders’ expression of humility because these variables have crucial roles in organizational functions. Japanese research on these variables has been scarce due to the lack of scales for assessing these variables in Japanese. From a methodological perspective, research conducted in Western and other cultures where most people understand English requires multicultural validation studies. Therefore, we developed Japanese versions of scales assessing psychological safety, knowledge sharing and expressed humility and assessed their structural validity, internal consistency and convergent validity. The results indicated factor structures and inter-correlations between the scales consistent with previous research. This work is novel because of its large samples across multiple job types in contemporary work organizations. We expect this study to make methodological and theoretical contributions to future research. © 2023 XLRI Jamshedpur, School of Business Management & Human Resources.

关键词： Engagement expressed humility inclusion knowledge sharing organization sciences psychological safety

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Compositional tuning of A_(2)B_(7)-type La_(0.7-x)Y_(x)Mg_(0.3)Ni_(3.5)alloys for gaseous hydrogen storage

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Journal of Rare Earths 2024年第10期42卷 1912-1919页

作者： Junkun Du Hui Wang Renheng Tang Jiangwen Liu Liuzhang Ouyang Min Zhu School of Materials Science and Engineering Guangdong Engineering Technology Research Center of Advanced Energy Storage MaterialsSouth China Universityof TechnologyGuangzhou510640China

Rare earth-based superlattice alloys have great potential for gaseous hydrogen storage,as well as successful application as nickel-metal hydride batteries *** this work,Y substitution was carried out to adjust the gaseous hydrogen storage properties of A_(2)B_(7)-type La_(0.7)Mg_(0.3)Ni_(3.5)*** results indicate a multiphase structure in the alloys comprised of the main rhombohedral Gd_(2)Co_(7)and PuNi_(3)phases,with a small amount of CaCu_(5)***,the Y substitution results in higher abundance of the Gd_(2)Co_(7)*** alloy La_(0.42)Y_(0.28)Mg_(0.3)Ni_(3.5)exhibits a hydrogen storage cap acity of 1.55 wt%at 298 K and a desorption plateau pressure of 0.244 *** addition,this alloy demonstrates a stable cycle life by a capacity retention of 94.2%after 50 cycles,with the main capacity degradation occurring during the initial 20 *** work accentuates the potential of the La-Y-Mg-Ni-based superlattice alloys for applications in solid-state hydrogen storage.

关键词： Hydrogen storage A_(2)B_(7)-type La-Mg-Ni alloys Y substitution Desorption plateau pressure Cycle performance Rare earths

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Inhibition of the intergranular brittleness of HR3C heat-resistant steel by strain-aging induced nano-M23C6 dispersion precipitation

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材料科学技术（英文版） 2025年第10期213卷 288-299页

作者： Xuehan Wang Lining Xu Lang Jiao Wenyao Li Jinna Mei Yanfen Zhao Lijie Qiao Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083PR China Suzhou Nuclear Power Research Institute Suzhou 215004PR China

M23C6 chromium-rich carbides are common grain-boundary precipitations in Cr-containing *** presence of grain-boundary carbides often leads to intergranular brittleness and decreases mechanical *** study proposes a deformation and aging technique to obtain a high-volume-fraction dispersion distribution of the hard nano-M23C6 phase by changing the nucleation sites from grain boundaries to deformation coherent twin boundaries produced during cold *** M23C6 precipitation-strengthened austenitic stainless steel has a strength of up to 1.4 GPa but maintains favor-able plasticity(＞11％).This study provides a novel approach for the control of intergranular brittleness in metallic materials.

关键词： HR3C steel M23C6 chromium-rich carbides Cold deformation Intergranular brittleness Deformation coherent twin boundary

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Enhancing reversibility of LiNi_(0.5)Mn_(1.5)O_(4)by regulating surface oxygen deficiency

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Carbon Energy 2023年第11期5卷 81-89页

作者： Dandan Wang Cong Gao Xuefeng Zhou Shang Peng Mingxue Tang Yonggang Wang Lujun Huang Wenge Yang Xiang Gao Center for High Pressure Science and Technology Advanced Research(HPSTAR) BeijingChina School of Materials Science and Engineering Harbin Institute of TechnologyHarbinChina

Oxygen deficiency has crucial effects on the crystal structure and electrochemical performance of spinel oxide lithium electrode materials such as LiNi_(0.5)Mn_(1.5)O_(4)(LNMO)*** particular,the oxygen stoichiometry on the crystal surface differs from that on the crystal interior in *** detection of local oxygen loss in LNMO and its correlation with the crystal structure and the cycling stability of LNMO remain *** this study,the effect of oxygen deficiency in LNMO controlled by sintering temperature on the surface crystal structure and electrochemical performance of LNMO is comprehensively *** high concentration of oxygen vacancies segregates at the surface regions of LNMO forming a thin rock‐salt and/or deficient spinel surface *** atomic‐level surface structure reconstruction was demonstrated by annular dark‐field and annular brightfield *** the synthesis of LNMO,the higher sintering temperature results in higher crystallinity but the higher oxygen deficiency in *** high crystallinity of LNMO would increase the thermal stability of LNMO cathodes while the high content of oxygen deficiency would decrease the surface structural stability of ***,the LNMO sintered at a medium temperature of 850°C achieved the best capacity *** results suggest a competitive function mechanism between oxygen stoichiometry and the crystallinity of LNMO on the cycling performance of LNMO.

关键词： electrochemical performance LiNi_(0.5)Mn_(1.5)O_(4) lithium‐ion battery oxygen vacancies surface reconstruction

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