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< Page ,Total 11 >
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: 2
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Abstract :

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: 1 SCOPUS Cited Count: 2
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Abstract :

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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Ceramic nanowelding SCIE PubMed Scopus
期刊论文 | 2018 , 9 | NATURE COMMUNICATIONS
WoS CC Cited Count: 3 SCOPUS Cited Count: 3
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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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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: 2 SCOPUS Cited Count: 5
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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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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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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: 1
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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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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
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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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Nanoscratching of copper surface by CeO2 EI SCIE Scopus
期刊论文 | 2017 , 124 , 343-350 | ACTA MATERIALIA | IF: 6.036
WoS CC Cited Count: 6 SCOPUS Cited Count: 7
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Abstract :

CeO2 nanoparticles based slurries are widely used for chemical mechanical polishing in integrated circuit manufacturing. However, the fundamental processes of material removal and planarization remain elusive. By combining a nanoindenter system with a homemade CeO2 tip, we investigated the nano scratching behavior of copper film quantitatively under both constant load and ramp load modes. Based on the evolution of the coefficient of friction, the nanoscratching behavior can be divided into three regimes. For regime I, the coefficient of friction decreases sharply along with the increasing normal load and the copper undergoes mainly elastic deformation. The friction wear begins to enter regime II once the normal load reaches a critical value from where both the coefficient of friction and scratch damage begin to exhibit a changing elastic-plastic characteristic with the increasing of normal load. In regime HI, the coefficient of friction reaches a steady value and becomes independent of the normal load and the deformation of copper film enters a steady elastic-plastic state. The coefficient of friction in regime I and II can be well modeled by Hertz contact theory and the classical friction models, respectively. Detailed analysis demonstrates the transition between the two models occurs when the stress concentration approaches the yield strength of copper and the material removal rate can be predicted by adjusting the parameter of the normal force and the abrasive particle size. (c) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

CeO2 tip Coefficient of friction Chemical mechanical planarization Wear Nanoscratch

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GB/T 7714 Xu, Ning , Han, Weizhong , Wang, Yuchun et al. Nanoscratching of copper surface by CeO2 [J]. | ACTA MATERIALIA , 2017 , 124 : 343-350 .
MLA Xu, Ning et al. "Nanoscratching of copper surface by CeO2" . | ACTA MATERIALIA 124 (2017) : 343-350 .
APA Xu, Ning , Han, Weizhong , Wang, Yuchun , Li, Ju , Shan, Zhiwei . Nanoscratching of copper surface by CeO2 . | ACTA MATERIALIA , 2017 , 124 , 343-350 .
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Small-volume aluminum alloys with native oxide shell deliver unprecedented strength and toughness EI SCIE Scopus
期刊论文 | 2017 , 126 , 202-209 | ACTA MATERIALIA | IF: 6.036
WoS CC Cited Count: 5 SCOPUS Cited Count: 7
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Abstract :

Mechanically robust nanoscale metallic materials are highly desirable in many miniaturized devices. However, the lack of strain hardening and controllable plasticity plagues such small-volume metals. Using Al-4Cu alloy as an example, here we show that a submicron-sized metallic material with ultrathin native oxide shell exhibits a high degree of deformation controllability, unprecedented strain hardening, size strengthening and toughness, in uniaxial tensile deformation. The metal native oxide "composite" is easy to make, and the emergent properties extend well beyond the benchmark range known for metals in a normalized (i.e., dimensionless) strength-toughness plot. The origin of the combination of strengthening and plastic stability is that an intact ultrathin native oxide shell exerts a strong confinement on dislocation movement and annihilation, thereby breaking the envelope on dislocation storage and strain hardening achievable in small-volume metals. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Strength Native oxide shell Small-volume metals Toughness Aluminum

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GB/T 7714 Li, Shi-Hao , Han, Wei-Zhong , Li, Ju et al. Small-volume aluminum alloys with native oxide shell deliver unprecedented strength and toughness [J]. | ACTA MATERIALIA , 2017 , 126 : 202-209 .
MLA Li, Shi-Hao et al. "Small-volume aluminum alloys with native oxide shell deliver unprecedented strength and toughness" . | ACTA MATERIALIA 126 (2017) : 202-209 .
APA Li, Shi-Hao , Han, Wei-Zhong , Li, Ju , Ma, Evan , Shan, Zhi-Wei . Small-volume aluminum alloys with native oxide shell deliver unprecedented strength and toughness . | ACTA MATERIALIA , 2017 , 126 , 202-209 .
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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: 17 SCOPUS Cited Count: 21
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Abstract :

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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