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Atypical Defect Motions in Brittle Layered Sodium Titanate Nanowires. EI PubMed Scopus SCIE
期刊论文 | 2018 , 9 (20) , 6052-6059 | The journal of physical chemistry letters
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Abstract :

In situ tensile tests show atypical defect motions in the brittle Na2Ti3O7 (NTO) nanowire (NW) within the elastic deformation range. After brittle fracture, elastic recovery of the NTO NW is followed by reversible motion of the defects in a time-dependent manner. An in situ cyclic loading-unloading test shows that these mobile defects shift back and forth along the NW in accordance with the loading-unloading cycles and eventually restore their initial positions after the load is completely removed. The existence of the defects within the NTO NWs and their motions does not lead to plastic deformation of the NW. The atypical defect motion is speculated to be the result of the glidibility of the TiO6 layers, where weakly bonded cation layers are in between. Exploration of the above novel observation can establish new understandings of the deformation behavior of superlattice nanostructures.

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GB/T 7714 Bo Arixin , Chen Kai , Pickering Edmund et al. Atypical Defect Motions in Brittle Layered Sodium Titanate Nanowires. [J]. | The journal of physical chemistry letters , 2018 , 9 (20) : 6052-6059 .
MLA Bo Arixin et al. "Atypical Defect Motions in Brittle Layered Sodium Titanate Nanowires." . | The journal of physical chemistry letters 9 . 20 (2018) : 6052-6059 .
APA Bo Arixin , Chen Kai , Pickering Edmund , Zhan Haifei , Bell John , Du Aijun et al. Atypical Defect Motions in Brittle Layered Sodium Titanate Nanowires. . | The journal of physical chemistry letters , 2018 , 9 (20) , 6052-6059 .
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Electron-Beam Induced Water Removal, Phase Change, and Crystallization of Anodic-Electrodeposited Turbostratic Nickel Hydroxide-Oxyhydroxide EI Scopus SCIE
期刊论文 | 2018 , 215 (23) | Physica Status Solidi (A) Applications and Materials Science
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

Water removal, phase transformation, and crystallization of turbostratic nickel hydroxide and oxyhydroxide (Ni(OH)2-NiOOH) are found to be inducible by the electron beam of a transmission electron microscope (TEM). Under 30 s of beam exposure at an accelerating voltage of 200 keV and a beam current density of 500 mA m−2, the original, characteristic turbostratic structure of Ni(OH)2-NiOOH is observed to disappear, caused by the quick removal of intercalated water molecules by the electron beam. Increasing the current density from a low value of 1.5 mA m−2 to a high value of 500 mA m−2 can transform the Ni(OH)2-NiOOH into nickel oxide (NiO) in 1 min. In situ heating and preheating experiments suggest that the transformation is caused by a heating effect induced by the electron beam. The results confirm that the mechanism previously discovered light-induced actuation of Ni(OH)2-NiOOH is caused by desorption of water molecules. © 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keyword :

Accelerating voltages In situ transmission electron microscopy (TEM) In-situ heating Intercalated water Nickel hydroxides Nickel oxides (NiO) Oxyhydroxides Turbostratic

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GB/T 7714 Kwan, Kin Wa , Xie, Degang , Zhang, Rongrong et al. Electron-Beam Induced Water Removal, Phase Change, and Crystallization of Anodic-Electrodeposited Turbostratic Nickel Hydroxide-Oxyhydroxide [J]. | Physica Status Solidi (A) Applications and Materials Science , 2018 , 215 (23) .
MLA Kwan, Kin Wa et al. "Electron-Beam Induced Water Removal, Phase Change, and Crystallization of Anodic-Electrodeposited Turbostratic Nickel Hydroxide-Oxyhydroxide" . | Physica Status Solidi (A) Applications and Materials Science 215 . 23 (2018) .
APA Kwan, Kin Wa , Xie, Degang , Zhang, Rongrong , Shan, Zhiwei , Ngan, Alfonso H. W. . Electron-Beam Induced Water Removal, Phase Change, and Crystallization of Anodic-Electrodeposited Turbostratic Nickel Hydroxide-Oxyhydroxide . | Physica Status Solidi (A) Applications and Materials Science , 2018 , 215 (23) .
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Insight from in situ microscopy into which precipitate morphology can enable high strength in magnesium alloys EI SCIE CSCD Scopus
期刊论文 | 2018 , 34 (7) , 1061-1066 | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
WoS CC Cited Count: 9 SCOPUS Cited Count: 14
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Abstract :

Magnesium alloys, while boasting light weight, suffer from a major drawback in their relatively low strength. Identifying the microstructural features that are most effective in strengthening is therefore a pressing challenge. Deformation twinning often mediates plastic yielding in magnesium alloys. Unfortunately, due to the complexity involved in the twinning mechanism and twin-precipitate interactions, the optimal precipitate morphology that can best impede twinning has yet to be singled out. Based on the understanding of twinning mechanism in magnesium alloys, here we propose that the lamellar precipitates or the network of plate-shaped precipitates are most effective in suppressing deformation twinning. This has been verified through quantitative in situ tests inside a transmission electron microscope on a series of magnesium alloys containing precipitates with different morphology. The insight gained is expected to have general implications for strengthening strategies and alloy design. (C) 2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.

Keyword :

Deformation twinning In-situ TEM Mechanical property Mg alloy Precipitate selection criterion

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GB/T 7714 Liu, Bo-Yu , Yang, Nan , Wang, Jian et al. Insight from in situ microscopy into which precipitate morphology can enable high strength in magnesium alloys [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2018 , 34 (7) : 1061-1066 .
MLA Liu, Bo-Yu et al. "Insight from in situ microscopy into which precipitate morphology can enable high strength in magnesium alloys" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 34 . 7 (2018) : 1061-1066 .
APA Liu, Bo-Yu , Yang, Nan , Wang, Jian , Barnett, Matthew , Xin, Yun-Chang , Wu, Di et al. Insight from in situ microscopy into which precipitate morphology can enable high strength in magnesium alloys . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2018 , 34 (7) , 1061-1066 .
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Ceramic nanowelding SCIE PubMed Scopus
期刊论文 | 2018 , 9 | NATURE COMMUNICATIONS
WoS CC Cited Count: 7 SCOPUS Cited Count: 5
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Abstract :

Ceramics possess high temperature resistance, extreme hardness, high chemical inertness and a lower density compared to metals, but there is currently no technology that can produce satisfactory joints in ceramic parts and preserve the excellent properties of the material. The lack of suitable joining techniques for ceramics is thus a major road block for their wider applications. Herein we report a technology to weld ceramic nanowires, with the mechanical strength of the weld stronger than that of the pristine nanowires. Using an advanced aberration-corrected environmental transmission electron microscope (ETEM) under a CO2 environment, we achieved ceramic nanowelding through the chemical reaction MgO + CO2 -> MgCO3 by using porous MgO as the solder. We conducted not only nanowelding on MgO, CuO, and V2O5 nanowires and successfully tested them in tension, but also macroscopic welding on a ceramic material such as SiO2, indicating the application potential of this technology in bottom-up ceramic tools and devices.

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GB/T 7714 Zhang, Liqiang , Tang, Yushu , Peng, Qiuming et al. Ceramic nanowelding [J]. | NATURE COMMUNICATIONS , 2018 , 9 .
MLA Zhang, Liqiang et al. "Ceramic nanowelding" . | NATURE COMMUNICATIONS 9 (2018) .
APA Zhang, Liqiang , Tang, Yushu , Peng, Qiuming , Yang, Tingting , Liu, Qiunan , Wang, Yuecun et al. Ceramic nanowelding . | NATURE COMMUNICATIONS , 2018 , 9 .
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Turning a native or corroded Mg alloy surface into an anti-corrosion coating in excited CO2 SCIE PubMed Scopus
期刊论文 | 2018 , 9 | NATURE COMMUNICATIONS
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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Abstract :

Despite their energy-efficient merits as promising light-weight structural materials, magnesium (Mg) based alloys suffer from inadequate corrosion resistance. One primary reason is that the native surface film on Mg formed in air mainly consists of Mg(OH)(2) and MgO, which is porous and unprotective, especially in humid environments. Here, we demonstrate an environmentally benign method to grow a protective film on the surface of Mg/Mg alloy samples at room temperature, via a direct reaction of already-existing surface film with excited CO2. Moreover, for samples that have been corroded obviously on surface, the corrosion products can be converted directly to create a new protective surface. Mechanical tests show that compared with untreated samples, the protective layer can elevate the yield stress, suppress plastic instability and prolong compressive strains without peeling off from the metal surface. This environmentally friendly surface treatment method is promising to protect Mg alloys, including those already-corroded on the surface..

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GB/T 7714 Wang, Yuecun , Liu, Boyu , Zhao, Xin'ai et al. Turning a native or corroded Mg alloy surface into an anti-corrosion coating in excited CO2 [J]. | NATURE COMMUNICATIONS , 2018 , 9 .
MLA Wang, Yuecun et al. "Turning a native or corroded Mg alloy surface into an anti-corrosion coating in excited CO2" . | NATURE COMMUNICATIONS 9 (2018) .
APA Wang, Yuecun , Liu, Boyu , Zhao, Xin'ai , Zhang, Xionghu , Miao, Yucong , Yang, Nan et al. Turning a native or corroded Mg alloy surface into an anti-corrosion coating in excited CO2 . | NATURE COMMUNICATIONS , 2018 , 9 .
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Capacity extended bismuth-antimony cathode for high-performance liquid metal battery EI SCIE Scopus
期刊论文 | 2018 , 381 , 38-45 | JOURNAL OF POWER SOURCES
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Li-Bi based liquid metal batteries (LMBs) have attracted interest due to their potential for solving grid scale energy storage problems. In this study, the feasibility of replacing the bismuth cathode with a bismuth-antimony alloy cathode in lithium based LMBs is investigated. The influence of the Bi:Sb ratio on voltage characteristics is evaluated via the constant current discharge method and electrochemical titration. On observing the cross section of the electrode at various stages of discharge, it is determined that both Sb and Bi form solid intermetallics with Li on the cathode. Additionally, the addition of Bi not only reduces the melting temperature of the Bi:Sb intermetallic but also actively contributes to the electrode capacity. Thereafter, a Li vertical bar LiCl-LiF vertical bar Sb-Bi liquid metal battery with 3 A h nameplate capacity, assembled and cycled at 1 C rate, is found to possess a stable capacity for over 160 cycles. The overall performance of this battery is discussed in the context of cost effectiveness, energy and coulombic efficiencies.

Keyword :

Bismuth-antimony alloys Liquid metal battery Cathode capacity Energy storage

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GB/T 7714 Dai, Tao , Zhao, Yue , Ning, Xiao-Hui et al. Capacity extended bismuth-antimony cathode for high-performance liquid metal battery [J]. | JOURNAL OF POWER SOURCES , 2018 , 381 : 38-45 .
MLA Dai, Tao et al. "Capacity extended bismuth-antimony cathode for high-performance liquid metal battery" . | JOURNAL OF POWER SOURCES 381 (2018) : 38-45 .
APA Dai, Tao , Zhao, Yue , Ning, Xiao-Hui , Narayan, R. Lakshmi , Li, Ju , Shan, Zhi-wei . Capacity extended bismuth-antimony cathode for high-performance liquid metal battery . | JOURNAL OF POWER SOURCES , 2018 , 381 , 38-45 .
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Effects of notches on the deformation behavior of submicron sized metallic glasses: Insights from in situ experiments EI SCIE Scopus
期刊论文 | 2018 , 154 , 172-181 | ACTA MATERIALIA
WoS CC Cited Count: 3 SCOPUS Cited Count: 2
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Reducing the size of metallic glasses (MG) to submicron or nanoscale levels improves their strength and ductility. However, there is no clear consensus in the literature regarding their mechanical behavior in the presence of a flaw or notch. In this work, quantitative tensile tests on notched submicron sized CuZr MG specimens were conducted inside a transmission electron microscope to study their deformation characteristics. Strength was found to be notch insensitive for shallow notched thick specimens, although reducing specimen dimensions and increasing notch sharpness enhances it by 14%. It was reasoned that the severity with which shear bands are geometrically constrained determines the strength and fracture morphology of notched specimens. Softening, accompanied with a transition to necking failure, occurs when the width of ligament that connects the notches is smaller than 80 nm. The competition between shear band propagation and plastic zone growth-mediated homogeneous activation of shear transformation zones was found to be responsible for this brittle to ductile transition. Current results provide unique insights into the various design aspects to be considered for reliable engineering of small scale components. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Metallic glass Strength Nano mechanical test In situ TEM Ductility Notch sensitivity

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GB/T 7714 Narayan, R. Lakshmi , Tian, Lin , Zhang, Danli et al. Effects of notches on the deformation behavior of submicron sized metallic glasses: Insights from in situ experiments [J]. | ACTA MATERIALIA , 2018 , 154 : 172-181 .
MLA Narayan, R. Lakshmi et al. "Effects of notches on the deformation behavior of submicron sized metallic glasses: Insights from in situ experiments" . | ACTA MATERIALIA 154 (2018) : 172-181 .
APA Narayan, R. Lakshmi , Tian, Lin , Zhang, Danli , Dao, Ming , Shan, Zhi-Wei , Hsia, K. Jimmy . Effects of notches on the deformation behavior of submicron sized metallic glasses: Insights from in situ experiments . | ACTA MATERIALIA , 2018 , 154 , 172-181 .
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Synthesis and properties of flexible nanocable with carbon nanotube @ polymer hierarchical structure EI SCIE PubMed Scopus
期刊论文 | 2017 , 28 (9) , 9 | NANOTECHNOLOGY | IF: 3.404
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A multi-functional polymer-carbon nanotube (CNT) nanocable with a hierarchical structure is fabricated by grafting poly (glycidyl methacrylate) (PGMA) from the CNT surface via activators regenerated by electron transfer atom transfer radical polymerization. Multiple CNTs are arranged in parallel in the fabricated nanocable and exhibit strong binding force with sheathing PGMA. In situ mechanical and electrical tests conducted on an individual nanocable reveal its high flexibility and excellent surface insulation, with an electrical resistance of approximately 1GO. On increasing the voltage to the nanocable's electrical breakdown point, nanoscale electrical trees are observed. Such degradation behavior is discussed in the wider context of breakdown mechanisms in polymer based CNTs.

Keyword :

flexible carbon nanotube surface insulation focusedion beam hierarchical structure

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GB/T 7714 Ren, Junwen , Wang, Xiaoguang , Ramasubramanian, Lakshmi Narayan et al. Synthesis and properties of flexible nanocable with carbon nanotube @ polymer hierarchical structure [J]. | NANOTECHNOLOGY , 2017 , 28 (9) : 9 .
MLA Ren, Junwen et al. "Synthesis and properties of flexible nanocable with carbon nanotube @ polymer hierarchical structure" . | NANOTECHNOLOGY 28 . 9 (2017) : 9 .
APA Ren, Junwen , Wang, Xiaoguang , Ramasubramanian, Lakshmi Narayan , Dong, Chengye , Cheng, Yonghong , Yu, Demei et al. Synthesis and properties of flexible nanocable with carbon nanotube @ polymer hierarchical structure . | NANOTECHNOLOGY , 2017 , 28 (9) , 9 .
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The Mechanical Properties of Nanowires SCIE PubMed Scopus
期刊论文 | 2017 , 4 (4) | ADVANCED SCIENCE | IF: 12.441
WoS CC Cited Count: 29 SCOPUS Cited Count: 32
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Applications of nanowires into future generation nanodevices require a complete understanding of the mechanical properties of the nanowires. A great research effort has been made in the past two decades to understand the deformation physics and mechanical behaviors of nanowires, and to interpret the discrepancies between experimental measurements and theoretical predictions. This review focused on the characterization and understanding of the mechanical properties of nanowires, including elasticity, plasticity, anelasticity and strength. As the results from the previous literature in this area appear inconsistent, a critical evaluation of the characterization techniques and methodologies were presented. In particular, the size effects of nanowires on the mechanical properties and their deformation mechanisms were discussed.

Keyword :

mechanical properties size effect nanowires characterization

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GB/T 7714 Wang, Shiliang , Shan, Zhiwei , Huang, Han . The Mechanical Properties of Nanowires [J]. | ADVANCED SCIENCE , 2017 , 4 (4) .
MLA Wang, Shiliang et al. "The Mechanical Properties of Nanowires" . | ADVANCED SCIENCE 4 . 4 (2017) .
APA Wang, Shiliang , Shan, Zhiwei , Huang, Han . The Mechanical Properties of Nanowires . | ADVANCED SCIENCE , 2017 , 4 (4) .
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Sliding of coherent twin boundaries SCIE PubMed Scopus
期刊论文 | 2017 , 8 | NATURE COMMUNICATIONS | IF: 12.353
WoS CC Cited Count: 9 SCOPUS Cited Count: 10
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Coherent twin boundaries (CTBs) are internal interfaces that can play a key role in markedly enhancing the strength of metallic materials while preserving their ductility. They are known to accommodate plastic deformation primarily through their migration, while experimental evidence documenting large-scale sliding of CTBs to facilitate deformation has thus far not been reported. We show here that CTB sliding is possible whenever the loading orientation enables the Schmid factors of leading and trailing partial dislocations to be comparable to each other. This theoretical prediction is confirmed by real-time transmission electron microscope experimental observations during uniaxial deformation of copper pillars with different orientations and is further validated at the atomic scale by recourse to molecular dynamics simulations. Our findings provide mechanistic insights into the evolution of plasticity in heavily twinned face-centered cubic metals, with the potential for optimizing mechanical properties with nanoscale CTBs in material design.

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GB/T 7714 Wang, Zhang-Jie , Li, Qing-Jie , Li, Yao et al. Sliding of coherent twin boundaries [J]. | NATURE COMMUNICATIONS , 2017 , 8 .
MLA Wang, Zhang-Jie et al. "Sliding of coherent twin boundaries" . | NATURE COMMUNICATIONS 8 (2017) .
APA Wang, Zhang-Jie , Li, Qing-Jie , Li, Yao , Huang, Long-Chao , Lu, Lei , Dao, Ming et al. Sliding of coherent twin boundaries . | NATURE COMMUNICATIONS , 2017 , 8 .
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