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< Page ,Total 13 >
The cross-transition of deformation twinning in magnesium EI
期刊论文 | 2022 , 206 | Scripta Materialia
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Abstract :

Deformation twinning operates via twinning dislocations gliding on a specific twinning plane and along a specific twinning direction. As a consequence, a twin variant is supposed to retain its identity and unable to transform into other variants. However, we demonstrated that for the {101¯2} deformation twinning in magnesium, one twin variant can transform towards its conjugated variant in response to the external applied loading via the participation of prismatic-basal interface migration. We term such transformation as cross-transition of deformation twinning, which is expected to broaden the understanding of twinning mechanism. © 2021

Keyword :

Magnesium Twinning Deformation

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GB/T 7714 Yang, Nan , Liu, Bo-Yu , Liu, Fei et al. The cross-transition of deformation twinning in magnesium [J]. | Scripta Materialia , 2022 , 206 .
MLA Yang, Nan et al. "The cross-transition of deformation twinning in magnesium" . | Scripta Materialia 206 (2022) .
APA Yang, Nan , Liu, Bo-Yu , Liu, Fei , Shan, Zhi-Wei . The cross-transition of deformation twinning in magnesium . | Scripta Materialia , 2022 , 206 .
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Carbon-nanotube-templated carbon nanofibers with improved mechanical performance EI SCIE
期刊论文 | 2021 , 129 (4) | Journal of Applied Physics
WoS CC Cited Count: 1
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Abstract :

The carbon nanotube (CNT) is a compelling and promising material for industrial applications requiring high strength and rigidity. For a multi-walled CNT (MWCNT), the nominal tensile strength and Young's modulus (considering the whole cross-sectional area of the specimen) are key mechanical factors for the practical application of macroscopic fibers and composites. However, the nominal tensile strength and Young's modulus of MWCNTs are much lower than their effective tensile strength and Young's modulus (considering the fracture cross-sectional area) because the outermost graphite layer always fractures first due to the low cross-link between graphite layers. In this paper, we fabricated the carbon nanofibers (CNFs) by epitaxial growth on super-aligned MWCNT film template and conducted in situ uniaxial tensile tests on individual carbon-nanotube-templated CNFs. The individual CNFs show improved nominal mechanical performance than previously reported MWCNTs. The nominal mechanical properties enhancement of the CNFs is attributed to the effective control on load transfer between interwalls. © 2021 Author(s).

Keyword :

Carbon nanofibers Tensile strength Nanotubes Tensile testing Elastic moduli Graphite Multiwalled carbon nanotubes (MWCN)

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GB/T 7714 Zhao, Wei , Zhang, Yongqiang , Wang, Xiaoguang et al. Carbon-nanotube-templated carbon nanofibers with improved mechanical performance [J]. | Journal of Applied Physics , 2021 , 129 (4) .
MLA Zhao, Wei et al. "Carbon-nanotube-templated carbon nanofibers with improved mechanical performance" . | Journal of Applied Physics 129 . 4 (2021) .
APA Zhao, Wei , Zhang, Yongqiang , Wang, Xiaoguang , Lu, Huanhuan , Liu, Guozhu , Wei, Jinghe et al. Carbon-nanotube-templated carbon nanofibers with improved mechanical performance . | Journal of Applied Physics , 2021 , 129 (4) .
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Quantifying Real-Time Sample Temperature Under the Gas Environment in the Transmission Electron Microscope Using a Novel MEMS Heater SCIE PubMed
期刊论文 | 2021 , 27 (4) , 758-766 | MICROSCOPY AND MICROANALYSIS
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Abstract :

Accurate control and measurement of real-time sample temperature are critical for the understanding and interpretation of the experimental results from in situ heating experiments inside environmental transmission electron microscope (ETEM). However, quantifying the real-time sample temperature remains a challenging task for commercial in situ TEM heating devices, especially under gas conditions. In this work, we developed a home-made micro-electrical-mechanical-system (MEMS) heater with unprecedented small temperature gradient and thermal drift, which not only enables the temperature evolution caused by gas injection to be measured in real-time but also makes the key heat dissipation path easier to model to theoretically understand and predict the temperature decrease. A new parameter termed as "gas cooling ability (H)", determined purely by the physical properties of the gas, can be used to compare and predict the gas-induced temperature decrease by different gases. Our findings can act as a reference for predicting the real temperature for in situ heating experiments without closed-loop temperature sensing capabilities in the gas environment, as well as all gas-related heating systems.

Keyword :

temperature measurement MEMS heater gas cooling effect in situ heating environmental TEM (ETEM)

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GB/T 7714 Li, Meng , Xie, De-Gang , Zhang, Xi-Xiang et al. Quantifying Real-Time Sample Temperature Under the Gas Environment in the Transmission Electron Microscope Using a Novel MEMS Heater [J]. | MICROSCOPY AND MICROANALYSIS , 2021 , 27 (4) : 758-766 .
MLA Li, Meng et al. "Quantifying Real-Time Sample Temperature Under the Gas Environment in the Transmission Electron Microscope Using a Novel MEMS Heater" . | MICROSCOPY AND MICROANALYSIS 27 . 4 (2021) : 758-766 .
APA Li, Meng , Xie, De-Gang , Zhang, Xi-Xiang , Yang, Judith C. , Shan, Zhi-Wei . Quantifying Real-Time Sample Temperature Under the Gas Environment in the Transmission Electron Microscope Using a Novel MEMS Heater . | MICROSCOPY AND MICROANALYSIS , 2021 , 27 (4) , 758-766 .
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Peristalsis-like migration of carbon-metabolizing catalytic nanoparticles SCIE
期刊论文 | 2021 , 49 | EXTREME MECHANICS LETTERS
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Abstract :

Translational and rotational motion of solid matter is normally driven by external physical forces. Here we report that under oxygen atmosphere inside an environmental transmission electron microscope, catalytic palladium nanoparticles underwent a self-propelled, peristalsis-like locomotion on a supporting substrate at a relatively low temperature. Surprisingly, the particles maintained crystalline interior and even conserved their initial crystal orientations during the dramatic liquid-like motion. Such "peristaltic" crystal migration with shape oscillation is found to be mediated by profuse surface diffusion, under chemical driving forces from palladium-catalyzed gaseous oxidation of a carbonaceous layer. These findings open a new avenue of efficient heterogeneous catalysis, and reveal emergent behavior that can arise out of an energy-metabolizing nano-system. (C) 2021 Elsevier Ltd. All rights reserved.

Keyword :

Surface diffusion Peristaltic locomotion Metallic nanoparticles Heterogeneous catalysis Environmental transmission electron microscopy Carbon removal

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GB/T 7714 Lu, Peng-Han , Xie, De-Gang , Liu, Bo-Yu et al. Peristalsis-like migration of carbon-metabolizing catalytic nanoparticles [J]. | EXTREME MECHANICS LETTERS , 2021 , 49 .
MLA Lu, Peng-Han et al. "Peristalsis-like migration of carbon-metabolizing catalytic nanoparticles" . | EXTREME MECHANICS LETTERS 49 (2021) .
APA Lu, Peng-Han , Xie, De-Gang , Liu, Bo-Yu , Ai, Fei , Zhang, Zhao-Rui , Jin, Ming-Shang et al. Peristalsis-like migration of carbon-metabolizing catalytic nanoparticles . | EXTREME MECHANICS LETTERS , 2021 , 49 .
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A real-time TEM study of the deformation mechanisms in beta-Ti reinforced bulk metallic glass composites EI SCIE
期刊论文 | 2021 , 818 | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
WoS CC Cited Count: 2
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Abstract :

The deformation mechanisms in a beta-Ti reinforced Zr-based bulk metallic glass composite (BMGC) are studied by extracting submicron sized tensile coupons of the crystalline and amorphous phase in their monolithic and bilaminate composite forms and tensile testing them inside a TEM. Results show that the monolithic BCC crystalline phase and amorphous phase have high yield strains, owing to small length scale effects, but undergo negligible post-yield elongation before failure. However, the ductility of the bilaminate composite is significantly higher (similar to 12.4%), provided the thickness of its amorphous portion is < 100 nm. Real time videos, which are supplemented by molecular dynamics simulations, show that the negligible post yield elongation of the monolithic BCC crystalline phase is caused by planar slip on one of the {110} planes. However, the bilaminate composite form exhibits strain hardening, despite the occurrence of planar slip, as dislocations pile up at the impervious amorphous/crystalline interface, which in turn, activates slip on other {110} planes. Strain hardening in the crystalline phase ceases when a shear band nucleated in the amorphous phase penetrates the dendrite along one of the slip planes. These mechanisms are extended to explain the flow behavior of beta-Ti reinforced BMGCs and strategies to improve the ductility are discussed.

Keyword :

bcc crystals Composite Amorphous alloys In situ mechanical testing Dislocations Plasticity

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GB/T 7714 Tian, Lin , Narayan, R. Lakshmi , Zhou, Kun et al. A real-time TEM study of the deformation mechanisms in beta-Ti reinforced bulk metallic glass composites [J]. | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 818 .
MLA Tian, Lin et al. "A real-time TEM study of the deformation mechanisms in beta-Ti reinforced bulk metallic glass composites" . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 818 (2021) .
APA Tian, Lin , Narayan, R. Lakshmi , Zhou, Kun , Babicheva, Rita , Ramamurty, Upadrasta , Shan, Zhi-wei . A real-time TEM study of the deformation mechanisms in beta-Ti reinforced bulk metallic glass composites . | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING , 2021 , 818 .
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Tension-compression asymmetry in amorphous silicon SCIE PubMed
期刊论文 | 2021 , 20 (10) , 1371-+ | NATURE MATERIALS
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Abstract :

Submicrometre-sized amorphous silicon samples show an unusually large tensile strength relative to the compressive strength, which is due to the reduced shear modulus and the activation energy barrier for shear transformations under compression. Hard and brittle materials usually exhibit a much lower strength when loaded in tension than in compression. However, this common-sense behaviour may not be intrinsic to these materials, but arises from their higher flaw sensitivity to tensile loading. Here, we demonstrate a reversed and unusually pronounced tension-compression asymmetry (tensile strength exceeds compressive strength by a large margin) in submicrometre-sized samples of isotropic amorphous silicon. The abnormal asymmetry in the yield strength and anelasticity originates from the reduction in shear modulus and the densification of the shear-activated configuration under compression, altering the magnitude of the activation energy barrier for elementary shear events in amorphous Si. In situ coupled electrical tests corroborate that compressive strains indeed cause increased atomic coordination (metallization) by transforming some local structures from sp(3)-bonded semiconducting motifs to more metallic-like sites, lending credence to the mechanism we propose. This finding opens up an unexplored regime of intrinsic tension-compression asymmetry in materials.

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GB/T 7714 Wang, Yuecun , Ding, Jun , Fan, Zhao et al. Tension-compression asymmetry in amorphous silicon [J]. | NATURE MATERIALS , 2021 , 20 (10) : 1371-+ .
MLA Wang, Yuecun et al. "Tension-compression asymmetry in amorphous silicon" . | NATURE MATERIALS 20 . 10 (2021) : 1371-+ .
APA Wang, Yuecun , Ding, Jun , Fan, Zhao , Tian, Lin , Li, Meng , Lu, Huanhuan et al. Tension-compression asymmetry in amorphous silicon . | NATURE MATERIALS , 2021 , 20 (10) , 1371-+ .
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A new approach of using Lorentz force to study single-asperity friction inside TEM EI SCIE
期刊论文 | 2021 , 84 , 43-48 | Journal of Materials Science and Technology
WoS CC Cited Count: 2
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Abstract :

Taking advantage of the magnetic field inside transmission electron microscope (TEM), a unique Lorentz-force-actuated method for quantitative friction tests was developed via a commercial electromechanical holder. With this approach, a submicron-sized silver asperity sliding on a tungsten flat punch was actuated by Lorentz force due to electrical current through the punch, with the normal force imposed by the built-in transducer of the holder. The friction force was determined by tracking the elastic deflection of the fabricated cantilever from in situ video. Through correlating the friction behavior with the microstructural evolution near the silver-tungsten interface, we revealed that even when the relative motion commenced with the plastic deformation of the silver asperity, the interface can still sustain the further increasing static friction force. Exactly following the arrival of the maximum static friction force, the sliding occurred at the interface, indicating the transition from static to dynamic friction. This work enriches our understanding of the underlying physics of the dynamic friction process for metallic friction behavior. © 2021

Keyword :

Lorentz force Tungsten Transmission electron microscopy Stiction Silver

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GB/T 7714 Lu, Huanhuan , Wang, Zhangjie , Yun, Di et al. A new approach of using Lorentz force to study single-asperity friction inside TEM [J]. | Journal of Materials Science and Technology , 2021 , 84 : 43-48 .
MLA Lu, Huanhuan et al. "A new approach of using Lorentz force to study single-asperity friction inside TEM" . | Journal of Materials Science and Technology 84 (2021) : 43-48 .
APA Lu, Huanhuan , Wang, Zhangjie , Yun, Di , Li, Ju , Shan, Zhiwei . A new approach of using Lorentz force to study single-asperity friction inside TEM . | Journal of Materials Science and Technology , 2021 , 84 , 43-48 .
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Achieving room-temperature M-2-phase VO2 nanowires for superior thermal actuation SCIE CSCD
期刊论文 | 2021 , 14 (11) , 4146-4153 | NANO RESEARCH
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Abstract :

Vanadium dioxide (VO2) has emerged as a promising micro-actuator material for its large amplitude and high work density across the transition between the insulating (M1 and M2) and metallic (R) phase. Even though M2-R transition offers about 70% higher transformation stress than M1-R structural phase transition, the application of the M2 phase in the micro-actuators is hindered by the fact that previously, M2 phase can only stay stable under tensile stress. In this work, we propose and verify that by synthesizing the VO2 nanowires under optimized oxygen-rich conditions, stoichiometry change can be introduced into the nanowires (NWs) which in turn yield a large number free-standing single-crystalline M2-phase NWs stable at room temperature. In addition, we demonstrate that the output stress of the M2-phase NWs is about 65% higher than that of the M1-phase NWs during their transition to R phase, quite close to the theoretical prediction. Our findings open new avenues towards enhancing the performance of VO2-based actuators by using M2-R transition.

Keyword :

transformation strain martensitic transformation micro-actuator room-temperature M2 phase single crystalline vanadium dioxide (VO2) nanowires metal-insulator transition

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GB/T 7714 Zhang, Yong-Qiang , Chen, Kai , Shen, Hao et al. Achieving room-temperature M-2-phase VO2 nanowires for superior thermal actuation [J]. | NANO RESEARCH , 2021 , 14 (11) : 4146-4153 .
MLA Zhang, Yong-Qiang et al. "Achieving room-temperature M-2-phase VO2 nanowires for superior thermal actuation" . | NANO RESEARCH 14 . 11 (2021) : 4146-4153 .
APA Zhang, Yong-Qiang , Chen, Kai , Shen, Hao , Wang, Yue-Cun , Hedhili, Mohamed Nejib , Zhang, Xixiang et al. Achieving room-temperature M-2-phase VO2 nanowires for superior thermal actuation . | NANO RESEARCH , 2021 , 14 (11) , 4146-4153 .
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Hydrogen enhanced cracking via dynamic formation of grain boundary inside aluminium crystal EI SCIE
期刊论文 | 2021 , 183 | CORROSION SCIENCE
WoS CC Cited Count: 1
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Abstract :

By in situ bending tests inside an environmental transmission electron microscope, we found that from the precrack tip of single crystalline aluminium cantilevers, dislocations are emitted and self-organized to build a low angle grain boundary (LAGB), along which the crack propagates more easily in hydrogen atmosphere than in vacuum. Atomistic modelling suggests that the LAGB formed can strongly trap hydrogen atoms, and its cohesive strength can be substantially reduced. These results imply that the hydrogen-induced transgranular crack in a polycrystalline metal can proceed by repeating a process of dynamically forming a hydrogenated LAGB and its subsequent separation in grain.

Keyword :

In situ bending test A C Modelling studies B Hydrogen embrittlement TEM Aluminium Low angle grain boundary Transgranular cracking

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GB/T 7714 Xie, De-Gang , Wan, Liang , Shan, Zhi-Wei . Hydrogen enhanced cracking via dynamic formation of grain boundary inside aluminium crystal [J]. | CORROSION SCIENCE , 2021 , 183 .
MLA Xie, De-Gang et al. "Hydrogen enhanced cracking via dynamic formation of grain boundary inside aluminium crystal" . | CORROSION SCIENCE 183 (2021) .
APA Xie, De-Gang , Wan, Liang , Shan, Zhi-Wei . Hydrogen enhanced cracking via dynamic formation of grain boundary inside aluminium crystal . | CORROSION SCIENCE , 2021 , 183 .
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Solidification of Mg-Zn-Zr Alloys: Grain Growth Restriction, Dendrite Coherency and Grain Size EI SCIE CSCD Scopus
期刊论文 | 2020 , 33 (11) , 1477-1486 | ACTA METALLURGICA SINICA-ENGLISH LETTERS
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Abstract :

The solidification characterization of Mg-xZn-0.5Zr (x = 0, 1, 3, 4, 5 wt%) alloys has been extensively investigated through thermal analysis, microstructure characterization and thermodynamic calculations. The impact of Zn content on the grain growth restriction, dendrite coherency and thus the final grain size has been investigated and discussed. Increasing Zn content, the grain size of Mg-xZn-0.5Zr alloy was firstly refined and then coarsened with the finest grain size of similar to 50 mu m for the Mg-3Zn-0.5Zr (ZK31) alloy. Significant effects of the grain size on the mechanical properties were observed in the investigated alloys. The combination of growth restriction factor theory and dendrite coherency point provides a reasonable explanation of the grain size results. It helps to further understand the mechanisms of grain refinement and grain coarsening related to solute content, providing reference for alloy design and grain size prediction.

Keyword :

Solidification Dendrite coherency Solute content Grain size Growth restriction Magnesium alloy

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GB/T 7714 Li, Pei , Hou, Danhui , Han, En-Hou et al. Solidification of Mg-Zn-Zr Alloys: Grain Growth Restriction, Dendrite Coherency and Grain Size [J]. | ACTA METALLURGICA SINICA-ENGLISH LETTERS , 2020 , 33 (11) : 1477-1486 .
MLA Li, Pei et al. "Solidification of Mg-Zn-Zr Alloys: Grain Growth Restriction, Dendrite Coherency and Grain Size" . | ACTA METALLURGICA SINICA-ENGLISH LETTERS 33 . 11 (2020) : 1477-1486 .
APA Li, Pei , Hou, Danhui , Han, En-Hou , Chen, Rongshi , Shan, Zhiwei . Solidification of Mg-Zn-Zr Alloys: Grain Growth Restriction, Dendrite Coherency and Grain Size . | ACTA METALLURGICA SINICA-ENGLISH LETTERS , 2020 , 33 (11) , 1477-1486 .
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