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学者姓名:单智伟

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Ceramic nanowelding SCIE PubMed Scopus
期刊论文 | 2018 , 9 | NATURE COMMUNICATIONS
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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
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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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Deformation of small-volume Al-4Cu alloy under electron beam irradiation EI SCIE Scopus
期刊论文 | 2017 , 141 , 183-192 | ACTA MATERIALIA | IF: 6.036
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Energetic electron beams (e-beams) are used in the welding, 3D printing and imaging of various materials. It is commonly accepted that the e-beam irradiation inside transmission electron microscope has a negligible effect on the intrinsic mechanical properties of small-volume metallic materials during in situ investigation. However, as small-volume Al is usually covered by a thin layer of native oxide, we show here that high-energy (200 key) e-beam irradiation can dramatically alter the deformation behavior. E-beam irradiation can drastically rejuvenate the amorphous structure of the oxide layer, producing a defective interface/surface, and promoting the transition of the deformation mode from internal dislocation multiplication to interface-dominated dislocation nucleation mediated plasticity, as indicated by the enhanced strain rate sensitivity and reduced activation volume. Moreover, the amorphous oxide layer undergoes viscous flow under the e-beam irradiation, such that nanoscale single crystal Al confined by a 29% volume fraction of native oxide shell exhibits more than 60% uniform elongation. (C) 2017 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Keyword :

Al oxide shell Strain rate sensitivity Ductility Electron beam irradiation Activation volume

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GB/T 7714 Li, Shi-Hao , Han, Wei-Zhong , Shan, Zhi-Wei . Deformation of small-volume Al-4Cu alloy under electron beam irradiation [J]. | ACTA MATERIALIA , 2017 , 141 : 183-192 .
MLA Li, Shi-Hao et al. "Deformation of small-volume Al-4Cu alloy under electron beam irradiation" . | ACTA MATERIALIA 141 (2017) : 183-192 .
APA Li, Shi-Hao , Han, Wei-Zhong , Shan, Zhi-Wei . Deformation of small-volume Al-4Cu alloy under electron beam irradiation . | ACTA MATERIALIA , 2017 , 141 , 183-192 .
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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: 2
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Abstract :

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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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: 4
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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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Synthesis and properties of flexible nanocable with carbon nanotube @ polymer hierarchical structure EI SCIE PubMed Scopus
期刊论文 | 2017 , 28 (9) | NANOTECHNOLOGY | IF: 3.404
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Abstract :

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) .
MLA Ren, Junwen et al. "Synthesis and properties of flexible nanocable with carbon nanotube @ polymer hierarchical structure" . | NANOTECHNOLOGY 28 . 9 (2017) .
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) .
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Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy EI SCIE PubMed Scopus
期刊论文 | 2017 , 17 (6) , 3725-3730 | NANO LETTERS | IF: 12.08
WoS CC Cited Count: 2
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Abstract :

The intriguing phenomenon of metal superelasticity relies on stress-induced martensitic transformation (SIMT), which is well-known to be governed by developing cooperative strain accommodation at multiple length scales. It is therefore scientifically interesting to see what happens when this natural length scale hierarchy is disrupted. One method is producing pillars that confine the sample volume to micrometer length scale. Here we apply yet another intervention, helium nanobubbles injection, which produces porosity on the order of several nanometers. While the pillar confinement suppresses superelasticity, we found the dispersion of 5-10 nm helium nanobubbles do the opposite of promoting superelasticity in a Ni53.5Fe19.5Ga27 shape memory alloy. The role of helium nanobubbles in modulating the competition between ordinary dislocation slip plasticity and SIMT is discussed.

Keyword :

irradiation superelasticity phase transformation helium bubble Shape memory alloy

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GB/T 7714 Han, Wei-Zhong , Zhang, Jian , Ding, Ming-Shuai et al. Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy [J]. | NANO LETTERS , 2017 , 17 (6) : 3725-3730 .
MLA Han, Wei-Zhong et al. "Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy" . | NANO LETTERS 17 . 6 (2017) : 3725-3730 .
APA Han, Wei-Zhong , Zhang, Jian , Ding, Ming-Shuai , Lv, Lan , Wang, Wen-Hong , Wu, Guang-Heng et al. Helium Nanobubbles Enhance Superelasticity and Retard Shear Localization in Small-Volume Shape Memory Alloy . | NANO LETTERS , 2017 , 17 (6) , 3725-3730 .
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Effect of hydrogen on the integrity of aluminium-oxide interface at elevated temperatures SCIE PubMed Scopus
期刊论文 | 2017 , 8 | NATURE COMMUNICATIONS | IF: 12.353
WoS CC Cited Count: 6
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Abstract :

Hydrogen can facilitate the detachment of protective oxide layer off metals and alloys. The degradation is usually exacerbated at elevated temperatures in many industrial applications; however, its origin remains poorly understood. Here by heating hydrogenated aluminium inside an environmental transmission electron microscope, we show that hydrogen exposure of just a few minutes can greatly degrade the high temperature integrity of metal-oxide interface. Moreover, there exists a critical temperature of similar to 150 degrees C, above which the growth of cavities at the metal-oxide interface reverses to shrinkage, followed by the formation of a few giant cavities. Vacancy supersaturation, activation of a long-range diffusion pathway along the detached interface and the dissociation of hydrogen-vacancy complexes are critical factors affecting this behaviour. These results enrich the understanding of hydrogen-induced interfacial failure at elevated temperatures.

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GB/T 7714 Li, Meng , Xie, De-Gang , Ma, Evan et al. Effect of hydrogen on the integrity of aluminium-oxide interface at elevated temperatures [J]. | NATURE COMMUNICATIONS , 2017 , 8 .
MLA Li, Meng et al. "Effect of hydrogen on the integrity of aluminium-oxide interface at elevated temperatures" . | NATURE COMMUNICATIONS 8 (2017) .
APA Li, Meng , Xie, De-Gang , Ma, Evan , Li, Ju , Zhang, Xi-Xiang , Shan, Zhi-Wei . Effect of hydrogen on the integrity of aluminium-oxide interface at elevated temperatures . | NATURE COMMUNICATIONS , 2017 , 8 .
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Helium Ion Microscope Fabrication Causing Changes in the Structure and Mechanical Behavior of Silicon Micropillars EI SCIE PubMed Scopus
期刊论文 | 2017 , 13 (1) | SMALL | IF: 9.598
WoS CC Cited Count: 4 SCOPUS Cited Count: 1
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GB/T 7714 Wang, Yue-Cun , Tian, Lin , Liu, Fan et al. Helium Ion Microscope Fabrication Causing Changes in the Structure and Mechanical Behavior of Silicon Micropillars [J]. | SMALL , 2017 , 13 (1) .
MLA Wang, Yue-Cun et al. "Helium Ion Microscope Fabrication Causing Changes in the Structure and Mechanical Behavior of Silicon Micropillars" . | SMALL 13 . 1 (2017) .
APA Wang, Yue-Cun , Tian, Lin , Liu, Fan , Qin, Yuan-Bin , Zheng, Gong , Wang, Jing-Tao et al. Helium Ion Microscope Fabrication Causing Changes in the Structure and Mechanical Behavior of Silicon Micropillars . | SMALL , 2017 , 13 (1) .
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In situ transmission electron microscopy study of the electrochemical sodiation process for a single CuO nanowire electrode EI SCIE Scopus
期刊论文 | 2016 , 6 (14) , 11441-11445 | RSC ADVANCES | IF: 3.108
WoS CC Cited Count: 6
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In this work, an in situ transmission electron microscopy (TEM) study of the electrochemically driven sodiation and desodiation of a CuO nanowire (NW) was performed. Upon sodiation, Na ions first reacted with CuO, yielding a mixture of Cu, Cu2O, and Na2O, and then some Cu2O was subsequently reduced into nanocrystal Cu. The final sodiation product was nanocrystalline Cu mixed with Na2O and Cu2O. Upon extraction of Na+, the nanocrystalline Cu first oxidized into Cu2O and finally transformed back to nanocrystalline CuO. The volume of the CuO NW was found to expand markedly during the first sodiation, but the morphology of the NW remained unchanged during the following cycles. The mechanism by which high-performance CuO NW anodes are used for rechargeable Na ion batteries was analyzed by carrying out an in situ TEM technique based on our results, and this study may be beneficial for designing the optimal structure of the CuO anode, improving its cycle performance, and making CuO more feasible for Na ion batteries.

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GB/T 7714 Zhang, Liqiang , Wang, Yuecun , Xie, Degang et al. In situ transmission electron microscopy study of the electrochemical sodiation process for a single CuO nanowire electrode [J]. | RSC ADVANCES , 2016 , 6 (14) : 11441-11445 .
MLA Zhang, Liqiang et al. "In situ transmission electron microscopy study of the electrochemical sodiation process for a single CuO nanowire electrode" . | RSC ADVANCES 6 . 14 (2016) : 11441-11445 .
APA Zhang, Liqiang , Wang, Yuecun , Xie, Degang , Tang, Yushu , Wu, Chunyang , Cui, Lishan et al. In situ transmission electron microscopy study of the electrochemical sodiation process for a single CuO nanowire electrode . | RSC ADVANCES , 2016 , 6 (14) , 11441-11445 .
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