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学者姓名：张跃飞
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Abstract ：
This study presents a detailed investigation into the deformation behaviour and the factors affecting the strength and ductility of laser powder bed fusion (LPBF) Ni-based superalloy 718 (Inconel 718) in both as-printed and heat-treated conditions using in-situ SEM + EBSD. The results show that following post-deposition high homogenization temperatures, the columnar grain structure of the as-printed Inconel 718 alloy successfully transformed to a nearly uniform grain size and the subsequent aging processes facilitated the precipitation of strengthening phases (gamma ', ' , gamma"). The specimen subjected to heat treatment (HT1) exhibited higher strength but lower ductility, while the as-printed specimen shows higher tensile elongation due to high initial dislocation density. In contrast, the heat-treated (HT2) specimen presented a more optimal combination of strength and ductility. The underlying mechanism for the enhanced tensile properties in the HT2 specimen was nearly homogeneous deformation trend across the grains and ultrafine precipitation of hardening phases. In addition, the twin boundaries were stable in the early deformation stages and maintained their orientation. Multiple slip systems were activated at the high-deformation stage, resulting in a high proportion of geometric necessary dislocations. Further, the interaction of deformation-induced dislocation with twin boundaries transformed them into general boundaries such as high and low-angle grain boundaries, ultimately increasing ductility. On contrary, in the HT1 specimen, the deformation inhomogeneity in grains enabled the strain localization at grain boundaries, which ultimately caused the early formation of cracks.
Keyword ：
Deformation mechanism Deformation mechanism Heat treatment Heat treatment In-situ EBSD In-situ EBSD Ni-based superalloy 718 Ni-based superalloy 718 Laser powder bed fusion Laser powder bed fusion
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| GB/T 7714 | Rizwan, Muhammad , Ullah, Rafi , Lu, Junxia et al. Insight into elongation and strength enhancement of heat-treated LPBF Ni-based superalloy 718 using in-situ SEM-EBSD [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2024 , 914 . |
| MLA | Rizwan, Muhammad et al. "Insight into elongation and strength enhancement of heat-treated LPBF Ni-based superalloy 718 using in-situ SEM-EBSD" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 914 (2024) . |
| APA | Rizwan, Muhammad , Ullah, Rafi , Lu, Junxia , Wang, Jin , Zhang, Yuefei , Zhang, Ze . Insight into elongation and strength enhancement of heat-treated LPBF Ni-based superalloy 718 using in-situ SEM-EBSD . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2024 , 914 . |
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Abstract ：
Lithium (Li) metal is a promising candidate for next-generation anode materials with high energy densities. However, Li dissolution/deposition processes are limited at the upper surface in contact with the electrolyte, which brings a locally high current density and then results in dendritic Li growth. This restraint of the local surface reaction during cycling has not been solved by commonly used modification strategies. In this study, a three-dimensional (3D) Li+ conductive skeleton is activated from atomic layer deposition (ALD) coating Li3PO4 (LPO) on the surface of the Ni foam (LPNF). Then, the skeleton is efficiently constructed in the Li metal anode by the lower-temperature Li infusion. Ionic conductor LPO layers and electronic conductor Ni fibers supply charge transport channels between the electrolyte and the internal Li. The mixed conductive network realizes holistic charge transfer, which is proved by in situ scanning electron microscopy experiments. In virtue of dispersive dissolution/deposition and optimized electrochemical kinetics brought by a Li+ conductive network, the composited Li electrode presents an excellent symmetric battery cycling stability (over 1200 h) and enhanced rate performances (stable cycling even at 10.0 mA cm-2). When matching with a LiCoO2 (LCO) cathode, LCO||Li@LPNF full batteries exhibit a capacity retention of 80.8% over 250 cycles. During cycling, there was no evidence of dendrite growth and the remaining Li in the composited anode showed a smooth, compact, and well-combined condition with LPNF. Through constructing a 3D Li+ conductive network, the composited Li metal anode breaks through the limit of the local surface reaction; this work proposes a novel insight of realizing holistic charging/discharging for the dendrite-free Li metal anode.
Keyword ：
holistic charging holistic charging Li3PO4 Li3PO4 discharging discharging Li plus conductivity Li plus conductivity Li metal anode Li metal anode in situ SEM observation in situ SEM observation dendrite-free dendrite-free
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| GB/T 7714 | Cao, Tianci , Cheng, Xiaopeng , Wang, Mingming et al. Realizing Holistic Charging-Discharging for Dendrite-Free Lithium Metal Anodes via Constructing Three-Dimensional Li plus Conductive Networks [J]. | ACS APPLIED MATERIALS & INTERFACES , 2023 . |
| MLA | Cao, Tianci et al. "Realizing Holistic Charging-Discharging for Dendrite-Free Lithium Metal Anodes via Constructing Three-Dimensional Li plus Conductive Networks" . | ACS APPLIED MATERIALS & INTERFACES (2023) . |
| APA | Cao, Tianci , Cheng, Xiaopeng , Wang, Mingming , Lu, Junxia , Niu, Jiajia , Liu, Huan et al. Realizing Holistic Charging-Discharging for Dendrite-Free Lithium Metal Anodes via Constructing Three-Dimensional Li plus Conductive Networks . | ACS APPLIED MATERIALS & INTERFACES , 2023 . |
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Abstract ：
The particle morphology determined by the sintering process is the director factor affecting the electrochemical performance of Ni-rich NMC cathode materials. To prepare the ideal NMC particles, it is of great significance to understand the morphological changes during sintering process. In this work, the morphology evolution of LiNi0.8Mn0.1Co0.1O2 (NMC811) synthesis at temperature ranging from 300-1080 degrees C were observed by in situ SEM. The uniform mixture of spherical Ni0.8Mn0.1Co0.1(OH)(2) precursor and lithium sources (LiOH) was employed by high temperature solid-state process inside the SEM, which enables us to observe morphology changes in real time. The results show that synthetic reaction of LiNi0.8Mn0.1Co0.1O2 usually includes three processes: the raw materials' dehydration, oxidation, and combination, accompanied by a significant reduction in particle size, which is important reference to control the synthesis temperature. As heating temperature rise, the morphology of mixture also changed from flake to brick-shaped. However, Ni nanoparticle formation is apparent at higher temperature similar to 1000 degrees C, suggesting a structural transformation from a layered to a rock-salt-like structure. Combining the insitu observed changes in size and morphology, and with the premise of ensuring the morphology change from flakes to bricks, reducing the sintering temperature as much as possible to prevent excessive reduction in particle size and layered to a rock-salt structure transformation is recommended for prepare ideal NMC particles. (C) 2021 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by ELSEVIER B.V. and Science Press. All rights reserved.
Keyword ：
High temperature imaging High temperature imaging Particle morphology Particle morphology Lithium-ion battery Lithium-ion battery NMC cathode NMC cathode In situ SEM In situ SEM
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| GB/T 7714 | Tang, Liang , Cheng, Xiaopeng , Wu, Rui et al. Monitoring the morphology evolution of LiNi0.8Mn0.1Co0.1O2 during high-temperature solid state synthesis via in situ SEM [J]. | JOURNAL OF ENERGY CHEMISTRY , 2022 , 66 : 9-15 . |
| MLA | Tang, Liang et al. "Monitoring the morphology evolution of LiNi0.8Mn0.1Co0.1O2 during high-temperature solid state synthesis via in situ SEM" . | JOURNAL OF ENERGY CHEMISTRY 66 (2022) : 9-15 . |
| APA | Tang, Liang , Cheng, Xiaopeng , Wu, Rui , Cao, Tianci , Lu, Junxia , Zhang, Yuefei et al. Monitoring the morphology evolution of LiNi0.8Mn0.1Co0.1O2 during high-temperature solid state synthesis via in situ SEM . | JOURNAL OF ENERGY CHEMISTRY , 2022 , 66 , 9-15 . |
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Abstract ：
Electrochemical actuators (EAs) with capabilities of triggering large deformation are attracting great interests because of their low stimulation voltage and high durability. However, porous electrode structures (PESs) with either a large unexpected strain or small-size inserted ions lead to small actuation strain and low energy transduction efficiency. To address this problem, an ideal electrode material, namely, pyrolytic graphite (PG), with an anisotropic densely stacked electrode structure (ASES), was proposed, and the optimal insertion ion, namely, AlCl4- with a large radius, was selected. Simulations show that an ASES presents an increased actuation strain and effectively eliminates unexpected strain. In addition, the insertion of AlCl4- into the graphite layers can lead to a directionally large volume expansion (>230%) due to the low energy barrier and large ionic radius. Experimental results reveal that the PG can expand/contract repeatedly with a high linear strain of approximate to 48% under a zero stress and approximate to 32% under a load of 2.5 MPa. EAs based on PG and AlCl4- achieve excellent actuation efficiency with an energy density of 105.89 J cm(-3), power density of 0.35 W cm(-3) and a high electromechanical transduction efficiency of up to 14.30%. This design method provides a significant way to develop high-performance EAs. (c) 2022 Elsevier Ltd. All rights reserved.
Keyword ：
Large anionic groups Large anionic groups Electrochemical actuators Electrochemical actuators Electromechanical transduction efficiency Electromechanical transduction efficiency Anisotropic expansion Anisotropic expansion
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| GB/T 7714 | Li, Na , Wang, Peng , Shi, Huifeng et al. An ultrahigh efficiency electrochemical actuator [J]. | EXTREME MECHANICS LETTERS , 2022 , 53 . |
| MLA | Li, Na et al. "An ultrahigh efficiency electrochemical actuator" . | EXTREME MECHANICS LETTERS 53 (2022) . |
| APA | Li, Na , Wang, Peng , Shi, Huifeng , Chen, Ya , Yang, Le , Zhang, Yuefei et al. An ultrahigh efficiency electrochemical actuator . | EXTREME MECHANICS LETTERS , 2022 , 53 . |
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Abstract ：
本文在密切关注新兴增材制造技术所产生的微观结构组织特征的同时，具体选取一种3D打印Ti-6Al-4V合金，分析其中的伯氏取向差结构。利用扫描电镜(SEM)、电子背散射衍射(EBSD)和统计性的五参数法，首先标定了合金结构中大量存在的α/α晶界，其次统计了α/α晶界的惯习面分布状况，之后对5种伯氏取向差分别进行了晶面取向织构分析，最后对5种伯氏取向差进行了晶界面理论结构计算。本文提出了α/α晶界识别判据并继而实现了在α/α晶界上进行伯氏取向差的准确表征，因而从具体观测技术层面发展了特定晶界的提取技术和典型取向差的结构分析技术。
Keyword ：
3D打印钛合金 3D打印钛合金 观测技术 观测技术 扫描电子显微镜 扫描电子显微镜 伯氏取向差 伯氏取向差 电子背散射衍射 电子背散射衍射
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| GB/T 7714 | 原效坤 , 张跃飞 , 吉元 et al. 3D打印钛合金晶界中的伯氏取向差观测方法 [J]. | 电子显微学报 , 2022 , 41 (01) : 32-39 . |
| MLA | 原效坤 et al. "3D打印钛合金晶界中的伯氏取向差观测方法" . | 电子显微学报 41 . 01 (2022) : 32-39 . |
| APA | 原效坤 , 张跃飞 , 吉元 , 魏崇斌 . 3D打印钛合金晶界中的伯氏取向差观测方法 . | 电子显微学报 , 2022 , 41 (01) , 32-39 . |
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Abstract ：
Although the rapid development of electrical energy storage devices has slowed down environmental pollution, their large-scale application has posed huge challenges to battery-related mineral resources; thus, extending the lifespan of high-voltage lithium cobalt oxide (LCO) is of great importance. Surface oxide coating is considered as the most common low-cost modification method for addressing unstable cycling performance. However, studies have shown that the oxide layer would further react with an electrolyte, while the investigation on the corresponding component evolution is lacking. Herein, a typical example utilizing the above reaction to realize surface reconstruction is presented. Applying atomic layer deposition (ALD), originally, an ultrathin Al2O3 layer is coated on the LCO surface; however, this coating layer has undergone reconstruction after reacting with electrolyte decomposition products during the cycling. Compared with simple coating, the in situ formed Li3AlF6 layer has a tighter binding to the LCO surface while possessing good Li+ conductivity and electrochemical stability. In addition, the unique properties of the ALD technology allow us to achieve ultrathin (1 nm) and conformal coating, which is beneficial for electronic conductivity and cycling stability. Furthermore, the surface phase transition layer stripping failure mechanism has first been revealed to explain the loss of Co and O, while the reconstructed Li3AlF6 effectively suppresses the surface stripping. Thus, excellent high-voltage performance has been realized (an 89% capacity retention after 1000 cycles at 4.5 V and an 88% capacity retention after 200 cycles at 4.6 V). This work casts a new understanding on the surface reconstruction of the oxide coating layer, which is also significant for other electrode materials' modification.
Keyword ：
atomic layer deposition atomic layer deposition Li3AlF6 Li3AlF6 surface reconstruction surface reconstruction surface stripping surface stripping high-voltage LCO high-voltage LCO
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| GB/T 7714 | Wu, Rui , Cao, Tianci , Liu, Huan et al. Ultralong Lifespan for High-Voltage LiCoO2 Enabled by In Situ Reconstruction of an Atomic Layer Deposition Coating Layer [J]. | ACS APPLIED MATERIALS & INTERFACES , 2022 , 14 (22) : 25524-25533 . |
| MLA | Wu, Rui et al. "Ultralong Lifespan for High-Voltage LiCoO2 Enabled by In Situ Reconstruction of an Atomic Layer Deposition Coating Layer" . | ACS APPLIED MATERIALS & INTERFACES 14 . 22 (2022) : 25524-25533 . |
| APA | Wu, Rui , Cao, Tianci , Liu, Huan , Cheng, Xiaopeng , Liu, Xianqiang , Zhang, Yuefei . Ultralong Lifespan for High-Voltage LiCoO2 Enabled by In Situ Reconstruction of an Atomic Layer Deposition Coating Layer . | ACS APPLIED MATERIALS & INTERFACES , 2022 , 14 (22) , 25524-25533 . |
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Abstract ：
Andronov-Hopf bifurcations, Pomeau-Manneville intermittent chaos and nonlinear vibrations of the large deployable space antenna (LDSA) subjected to the thermal load with the case of 1:3 internal resonance are studied for the first time. The frequencies and vibration modes of the LDSA are analyzed by using the finite element method. It is found that there may exist an approximate threefold relationship between the fourth-order and first-order frequencies of the LDSA. The LDSA is simplified to a composite laminated equivalent cylindrical shell clamped along a generatrix and with the radial pre-stretched membranes at two ends subjected to the thermal load. Considering the case of 1:3 internal resonance, four-dimensional nonlinear averaged equations are obtained by using the method of multiple scales. The amplitude-frequency response curves and amplitude-force response curves are obtained for the LDSA subjected to the thermal load through the prediction-correction continuation algorithm. The fold bifurcation and Andronov-Hopf bifurcation points are located on these resonant response curves. The equivalent model of the LDSA has the hardening spring characteristics. The thermal load has very significant influences on the stability of the LDSA. The nonlinear dynamics of the equivalent model for the LDSA are investigated by using the fourth-order Runge-Kutta algorithm. These nonlinear dynamic behaviors are described by the bifurcation diagrams, waveforms, phase plots, and Poincare maps. The periodic doubling bifurcation and Pomeau-Manneville type intermittent chaos appear in this nonlinear dynamical system. According to the topological evolution of the phase trajectories, the phase-locking phenomenon and a special evolution path of the chaotic attractors are found. (c) 2021 Elsevier Ltd. All rights reserved.
Keyword ：
Equivalent cylindrical shell model Equivalent cylindrical shell model Periodic doubling bifurcation Periodic doubling bifurcation 1:3 internal resonance 1:3 internal resonance Pomeau-Manneville type intermittent chaos Pomeau-Manneville type intermittent chaos Large deployable space antenna Large deployable space antenna
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| GB/T 7714 | Liu, T. , Zhang, W. , Zheng, Y. et al. Andronov-Hopf bifurcations, Pomeau-Manneville intermittent chaos and nonlinear vibrations of large deployable space antenna subjected to thermal load and radial pre-stretched membranes with 1:3 internal resonance [J]. | CHAOS SOLITONS & FRACTALS , 2021 , 144 . |
| MLA | Liu, T. et al. "Andronov-Hopf bifurcations, Pomeau-Manneville intermittent chaos and nonlinear vibrations of large deployable space antenna subjected to thermal load and radial pre-stretched membranes with 1:3 internal resonance" . | CHAOS SOLITONS & FRACTALS 144 (2021) . |
| APA | Liu, T. , Zhang, W. , Zheng, Y. , Zhang, Y. F. . Andronov-Hopf bifurcations, Pomeau-Manneville intermittent chaos and nonlinear vibrations of large deployable space antenna subjected to thermal load and radial pre-stretched membranes with 1:3 internal resonance . | CHAOS SOLITONS & FRACTALS , 2021 , 144 . |
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Abstract ：
The primary resonance and nonlinear vibrations of the functionally graded graphene platelet (FGGP)-reinforced rotating pretwisted composite blade under combined the external and multiple parametric excitations are investigated with three different distribution patterns. The FGGP-reinforced rotating pretwisted composite blade is simplified to the rotating pretwisted composite cantilever plate reinforced by the functionally graded graphene platelet. It is novel to simplify the leakage of the airflow in the tip clearance to the non-uniform axial excitation. The rotating speed of the steady state adding a small periodic perturbation is considered. The aerodynamic load subjecting to the surface of the plate is simulated as the transverse excitation. Utilizing the first-order shear deformation theory, von Karman nonlinear geometric relationship, Lagrange equation and mode functions satisfying the boundary conditions, three-degree-of-freedom nonlinear ordinary differential equations of motion are derived for the FGGP-reinforced rotating pretwisted composite cantilever plate under combined the external and multiple parametric excitations. The primary resonance and nonlinear dynamic behaviors of the FGGP-reinforced rotating pretwisted composite cantilever plate are analyzed by Runge-Kutta method. The amplitude-frequency response curves, force-frequency response curves, bifurcation diagrams, maximum Lyapunov exponent, phase portraits, waveforms and Poincare map are obtained to investigate the nonlinear dynamic responses of the FGGP-reinforced rotating pretwisted composite cantilever plate under combined the external and multiple parametric excitations.
Keyword ：
Rotating pretwisted composite blade Rotating pretwisted composite blade Graphene platelet Graphene platelet Chaotic vibrations Chaotic vibrations External and multiple parametric excitations External and multiple parametric excitations Leakage of airflow Leakage of airflow
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| GB/T 7714 | Gu, X. J. , Zhang, W. , Zhang, Y. F. . Nonlinear vibrations of rotating pretwisted composite blade reinforced by functionally graded graphene platelets under combined aerodynamic load and airflow in tip clearance [J]. | NONLINEAR DYNAMICS , 2021 , 105 (2) : 1503-1532 . |
| MLA | Gu, X. J. et al. "Nonlinear vibrations of rotating pretwisted composite blade reinforced by functionally graded graphene platelets under combined aerodynamic load and airflow in tip clearance" . | NONLINEAR DYNAMICS 105 . 2 (2021) : 1503-1532 . |
| APA | Gu, X. J. , Zhang, W. , Zhang, Y. F. . Nonlinear vibrations of rotating pretwisted composite blade reinforced by functionally graded graphene platelets under combined aerodynamic load and airflow in tip clearance . | NONLINEAR DYNAMICS , 2021 , 105 (2) , 1503-1532 . |
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It is well-accepted that massive cracks in Ni-rich cathode secondary particles are the determining factors for long-term performance degradation; however, the corresponding crack generation and the state of dynamic propagation are still unknown. In this work, we utilize in situ scanning electron microscopy to reveal the dynamical morphological evolution of a single LiNi0.8Mn0.1Co0.1O2 secondary particle embedded in a cathode blend during electrochemical cycling. These observations show that very few cracks appear in the particle when cycled at a normal cutoff voltage of 4.1 V, but when the cutoff voltage is increased to 4.7 V as an extreme working condition, several cracks were clearly initially generated in the core region and propagated radially along the grain boundaries, finally reaching the particle's surface. Impressively, crack propagation follows a repeat "grow-stagnate-grow" phenomenon during charge-discharge cycling. Our direct in situ investigation provides a full map of crack evolution in the cathode under electrochemical cycling during early stages.
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| GB/T 7714 | Cheng, Xiaopeng , Li, Yonghe , Cao, Tianci et al. Real-Time Observation of Chemomechanical Breakdown in a Layered Nickel-Rich Oxide Cathode Realized by In Situ Scanning Electron Microscopy [J]. | ACS ENERGY LETTERS , 2021 , 6 (5) : 1703-1710 . |
| MLA | Cheng, Xiaopeng et al. "Real-Time Observation of Chemomechanical Breakdown in a Layered Nickel-Rich Oxide Cathode Realized by In Situ Scanning Electron Microscopy" . | ACS ENERGY LETTERS 6 . 5 (2021) : 1703-1710 . |
| APA | Cheng, Xiaopeng , Li, Yonghe , Cao, Tianci , Wu, Rui , Wang, Mingming , Liu, Huan et al. Real-Time Observation of Chemomechanical Breakdown in a Layered Nickel-Rich Oxide Cathode Realized by In Situ Scanning Electron Microscopy . | ACS ENERGY LETTERS , 2021 , 6 (5) , 1703-1710 . |
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Abstract ：
采用超声振动滚压加工技术对Ti-6Al-4V合金表面进行处理,探究该项技术对Ti-6Al-4V合金表面质量的影响。通过对该工艺加工前后的Ti-6Al-4V合金进行表面粗糙度参数、XRD图谱、截面微观形貌、表层残余应力及显微硬度的对比分析,结果表明:经该工艺处理后的合金表面各项粗糙度参数皆有明显降低;加工后的合金表面XRD图谱的衍射峰减弱且宽化,衍射角向高角度方向偏移;加工后的合金表层β相组织相较加工前明显细化,且随着深度增加β相组织逐渐增大;在距离表面约50μm位置的残余应力值最大可达到-967 MPa;加工后的合金表面显微硬度可达到421HV,且在0～140μm的深度范围内,显微硬度随着深度...
Keyword ：
粗糙度参数 粗糙度参数 显微硬度 显微硬度 超声振动滚压 超声振动滚压 微观结构 微观结构 残余应力 残余应力 Ti-6Al-4V Ti-6Al-4V
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| GB/T 7714 | 席刚 , 刘元铭 , 张跃飞 et al. Ti-6Al-4V合金表面超声振动滚压强化研究 [J]. | 材料科学与工艺 , 2021 , 29 (01) : 91-96 . |
| MLA | 席刚 et al. "Ti-6Al-4V合金表面超声振动滚压强化研究" . | 材料科学与工艺 29 . 01 (2021) : 91-96 . |
| APA | 席刚 , 刘元铭 , 张跃飞 , 刘燕萍 . Ti-6Al-4V合金表面超声振动滚压强化研究 . | 材料科学与工艺 , 2021 , 29 (01) , 91-96 . |
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