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学者姓名：王立华
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摘要 ：
本发明公开了一种在透射电子显微镜中，为纳米金属样品提供原子级原位等静压力学性能测试的装置及方法。本发明属于纳米材料显微结构原位测试及表征技术领域。本发明创新性地设计了一种新的等静压容器装置：采用微操作技术将纳米金属样品加载并封装在两个碳纳米锥中间，即可获得一种等静压容器。更重要的是，该设计还创新性地实现了金属样品在透射电子显微镜中的原位等静压力学性能测试：通过探针挤压碳纳米锥的侧壁，对等静压环境中的金属样品施加等静压力，从而实现金属样品在透射电子显微镜中的原位等静压力学性能测试，静压大小可控。
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| GB/T 7714 | 王立华 , 李超杰 , 徐建勋 et al. 原位测量金属材料的力学性能及微观结构的装置及方法 : CN202310675436.X[P]. | 2023-06-07 . |
| MLA | 王立华 et al. "原位测量金属材料的力学性能及微观结构的装置及方法" : CN202310675436.X. | 2023-06-07 . |
| APA | 王立华 , 李超杰 , 徐建勋 , 韩晓东 , 赵宇亮 . 原位测量金属材料的力学性能及微观结构的装置及方法 : CN202310675436.X. | 2023-06-07 . |
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摘要 ：
Behaviors of ultrathin metallic nanowires under strain conditions have attracted plenty of interest due to their unique properties and structures. Here, for the first time, we provide direct atomic-scale observations of the reversible chiral structure transformation of the gold nanowire under tensile strain conditions in transmission electron microscopy. The formation and disappearance of a (111) projection in the (110) projected nanowire were observed during the structural transformation. We reveal that the chiral structure transformation is induced by the nanowire twisting behavior, which is achieved via atomic plane rotation and nanowire bending. Our results provide direct evidence for an expressive and deterministic reversible transformation from a symmetrical face-centered-cubic structure to the chiral structure of gold nanowires, which enables an atomic-scale understanding of the behavior of ultra-thin nanostructure and provides guidance in the design of nano-devices.
关键词 ：
Reversible chiral structure transformation Reversible chiral structure transformation In situ In situ Gold nanowire Gold nanowire Atomic -scale Atomic -scale
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| GB/T 7714 | Kong, Deli , Hao, Longhu , Liu, Linlin et al. Reversible chiral structure transformation of ultra-thin gold nanowire under tensile strain conditions [J]. | SCRIPTA MATERIALIA , 2023 , 242 . |
| MLA | Kong, Deli et al. "Reversible chiral structure transformation of ultra-thin gold nanowire under tensile strain conditions" . | SCRIPTA MATERIALIA 242 (2023) . |
| APA | Kong, Deli , Hao, Longhu , Liu, Linlin , Teng, Jiao , Long, Haibo , Lu, Yan et al. Reversible chiral structure transformation of ultra-thin gold nanowire under tensile strain conditions . | SCRIPTA MATERIALIA , 2023 , 242 . |
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摘要 ：
Understanding the competing modes of brittle versus ductile fracture is critical for preventing the failure of body-centered cubic (BCC) refractory metals. Despite decades of intensive investigations, the nanoscale fracture processes and associated atomistic mechanisms in BCC metals remain elusive due to insufficient atomic-scale experimental evidence. Here, we perform in situ atomic-resolution observations of nanoscale fracture in single crystals of BCC Mo. The crack growth process involves the nucleation, motion, and interaction of dislocations on multiple 1/2 < 111 > {110} slip systems at the crack tip. These dislocation activities give rise to an alternating sequence of crack-tip plastic shearing, resulting in crack blunting, and local separation normal to the crack plane, leading to crack extension and sharpening. Atomistic simulations reveal the effects of temperature and strain rate on these alternating processes of crack growth, providing insights into the dislocation-mediated mechanisms of the ductile to brittle transition in BCC refractory metals.
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| GB/T 7714 | Lu, Yan , Chen, Yongchao , Zeng, Yongpan et al. Nanoscale ductile fracture and associated atomistic mechanisms in a body-centered cubic refractory metal [J]. | NATURE COMMUNICATIONS , 2023 , 14 (1) . |
| MLA | Lu, Yan et al. "Nanoscale ductile fracture and associated atomistic mechanisms in a body-centered cubic refractory metal" . | NATURE COMMUNICATIONS 14 . 1 (2023) . |
| APA | Lu, Yan , Chen, Yongchao , Zeng, Yongpan , Zhang, Yin , Kong, Deli , Li, Xueqiao et al. Nanoscale ductile fracture and associated atomistic mechanisms in a body-centered cubic refractory metal . | NATURE COMMUNICATIONS , 2023 , 14 (1) . |
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摘要 ：
Nanosized metals usually exhibit ultrahigh strength but suffer from low homogeneous plasticity. The origin of a strength-ductility trade-off has been well studied for pure metals, but not for random solid solution (RSS) alloys. How RSS alloys accommodate plasticity and whether they can achieve synergy between high strength and superplasticity has remained unresolved. Here, we show that face-centered cubic (FCC) RSS AuCu alloy nanowires (NWs) exhibit superplasticity of similar to 260% and ultrahigh strength of similar to 6 GPa, overcoming the trade-off between strength and ductility. These excellent properties originate from profuse hexagonal close-packed (HCP) phase generation (2H and 4H phases), recurrence of reversible FCC-HCP phase transition, and zigzag-like nanotwin generation, which has rarely been reported before. Such a mechanism stems from the inherent chemical inhomogeneity, which leads to widely distributed and overlapping energy barriers for the concurrent activation of multiple plasticity mechanisms. This naturally implies a similar deformation behavior for other highly concentrated solid-solution alloys with multiple principal elements, such as high/medium-entropy alloys. Our findings shed light on the effect of chemical inhomogeneity on the plastic deformation mechanism of solid-solution alloys.
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| GB/T 7714 | Yang, Chengpeng , Zhang, Bozhao , Fu, Libo et al. Chemical inhomogeneity-induced profuse nanotwinning and phase transformation in AuCu nanowires [J]. | NATURE COMMUNICATIONS , 2023 , 14 (1) . |
| MLA | Yang, Chengpeng et al. "Chemical inhomogeneity-induced profuse nanotwinning and phase transformation in AuCu nanowires" . | NATURE COMMUNICATIONS 14 . 1 (2023) . |
| APA | Yang, Chengpeng , Zhang, Bozhao , Fu, Libo , Wang, Zhanxin , Teng, Jiao , Shao, Ruiwen et al. Chemical inhomogeneity-induced profuse nanotwinning and phase transformation in AuCu nanowires . | NATURE COMMUNICATIONS , 2023 , 14 (1) . |
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摘要 ：
Polymeric carbon nitride (C3N4) is a very attractive candidate to produce photocatalytic hydrogen peroxide (H2O2) due to its low-cost, metal-free characteristics. However, the low efficiency would limit its development to higher yields because of insufficient light absorption and electron-hole separation. Here, we developed a simple method to anchor CN quantum dots (QDs) onto g-C3N4 nanosheets to form a homojunction structure (HJ-C3N4), which could improve photocatalytic performance largely without introducing metal elements. Its superior efficiency is a result of the band alignment by the homojunction structure providing excellent electron-hole separation and QDs providing suppressed recombination. Simultaneously, the light responsiveness of QDs endows a wide spectrum-responsive adsorption and enhances the adsorption intensity. The H2O2 yield of the HJ-C3N4 reached 115 mu mol L-1 h(-1) in pure water by visible light, which has an 8.6x higher production than g-C3N4 nanosheets. The material design of 0D/2D homojunction could be extended to other materials with specific band alignment.
关键词 ：
Band alignment Band alignment Carbon nitride Carbon nitride Quantum dots Quantum dots H2O2 H2O2 Homojunction Homojunction
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| GB/T 7714 | Ma, Peijie , Zhang, Xu , Wang, Cong et al. Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution [J]. | APPLIED CATALYSIS B-ENVIRONMENTAL , 2022 , 300 . |
| MLA | Ma, Peijie et al. "Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution" . | APPLIED CATALYSIS B-ENVIRONMENTAL 300 (2022) . |
| APA | Ma, Peijie , Zhang, Xu , Wang, Cong , Wang, Zhiwei , Wang, Kaiwen , Feng, Yibo et al. Band alignment of homojunction by anchoring CN quantum dots on g-C3N4 (0D/2D) enhance photocatalytic hydrogen peroxide evolution . | APPLIED CATALYSIS B-ENVIRONMENTAL , 2022 , 300 . |
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摘要 ：
一种透射电镜中原位测量一维纳米材料疲劳性能与微观结构相关性的装置及方法，属于纳米材料显微结构原位测试及表征技术领域。包括芯片部分，支撑部分和操控电路三部分。支撑部分为安装在透射样品杆上的支架和排线，电路部分为与芯片链接的导线和能够施加不同波形、可变电压与可变频率的电源。本设计突破了传统的机械应力驱动疲劳性能的测试方法，利用电压形成的电场并通过调节电压的大小和频率，实现不同振幅和周期的可控调节，使一维纳米材料在电场中发生振动实现疲劳性能的测试；同时利用透射电镜原位观察一维纳米材料疲劳实验过程中原子层次微观结构的演变过程，直接建立疲劳性能与微观结构的相关性。
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| GB/T 7714 | 王立华 , 马琰 , 韩晓东 et al. 一种透射电镜中原位测量一维纳米材料疲劳性能与微观结构相关性的装置及方法 : CN202210898463.9[P]. | 2022-07-28 . |
| MLA | 王立华 et al. "一种透射电镜中原位测量一维纳米材料疲劳性能与微观结构相关性的装置及方法" : CN202210898463.9. | 2022-07-28 . |
| APA | 王立华 , 马琰 , 韩晓东 , 邓青松 . 一种透射电镜中原位测量一维纳米材料疲劳性能与微观结构相关性的装置及方法 : CN202210898463.9. | 2022-07-28 . |
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摘要 ：
The formation of metallic glass through melt processing proves to be the most challenging for pure monatomic face-centered cubic (FCC) metals. Though it has long been conjectured that amorphous monatomic metals can be generated through deforming a solid at room temperature, there is rarely direct evidence to prove that is indeed the case. In this study, mechanical loading was applied to nanometer-sized crystals inside an aberration-corrected transmission electron microscopy, and atomic-scale in situ evidence is provided of strain-induced amorphization in Pt and Ni near room tempera -ture. The loading was applied in such a way that the stress state is complicated, and the strain distri-bution is non-uniform, restricting dislocation activities in accommodating the imposed strain. The local lattice distortion is then rendered so large and the associated strain energy is so high that the crys-tal collapses into the amorphous state. As such, even elemental FCC metals can be forced to become amorphous.(c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词 ：
Strain-induced amorphization Strain-induced amorphization Metallic glass Metallic glass Phase transformations Phase transformations Dislocation Dislocation Transmission electron microscopy (TEM) Transmission electron microscopy (TEM)
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| GB/T 7714 | Wang, Zhanxin , Chen, Nianke , Li, Xianbin et al. Atomic-scale observation of strain-induced local amorphization in face-centered cubic metals [J]. | SCRIPTA MATERIALIA , 2022 , 212 . |
| MLA | Wang, Zhanxin et al. "Atomic-scale observation of strain-induced local amorphization in face-centered cubic metals" . | SCRIPTA MATERIALIA 212 (2022) . |
| APA | Wang, Zhanxin , Chen, Nianke , Li, Xianbin , Teng, Jiao , Guo, Yizhong , Fu, Libo et al. Atomic-scale observation of strain-induced local amorphization in face-centered cubic metals . | SCRIPTA MATERIALIA , 2022 , 212 . |
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摘要 ：
纳米Ir薄膜中缺陷结构的原子尺度研究
关键词 ：
缺陷 缺陷 多重孪晶 多重孪晶 面心立方 面心立方 位错 位错 原子尺度 原子尺度 孪晶界 孪晶界
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| GB/T 7714 | 韦如建 , 贺昕 , 王兴权 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 [J]. | 韦如建 , 2021 , 40 (2) : 101-107 . |
| MLA | 韦如建 et al. "纳米Ir薄膜中缺陷结构的原子尺度研究" . | 韦如建 40 . 2 (2021) : 101-107 . |
| APA | 韦如建 , 贺昕 , 王兴权 , 熊晓东 , 罗俊锋 , 闻明 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 . | 韦如建 , 2021 , 40 (2) , 101-107 . |
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摘要 ：
金属铱(Ir)因具有高密度,高熔点,高硬度等特点而被广泛应用于航空航天、军工等高新科技领域.但Ir的塑性差,严重影响其进一步广泛应用.金属自身的结构及缺陷对其力学性能具有重要影响,研究Ir的原子尺度微观结构可为其力学性能优化提供重要参考.本文主要利用透射电子显微镜(TEM)对纳米Ir薄膜中的缺陷类型和缺陷密度进行了研究.发现薄膜中存在高密度的孪晶以及位错.其中,薄膜中的孪晶密度为1.6×103(1/μm2).此外,研究还发现薄膜中有两大类缺陷的相互作用:位错与孪晶相互作用以及孪晶与孪晶相互作用.前者包括层错与孪晶相互作用以及全位错对孪晶的钉扎作用;孪晶之间的相互作用形态包括头对头对接式,三重孪晶和五重孪晶等多种形态.
关键词 ：
位错 位错 多重孪晶 多重孪晶 原子尺度 原子尺度 面心立方 面心立方 孪晶界 孪晶界 缺陷 缺陷
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| GB/T 7714 | 韦如建 , 贺昕 , 王兴权 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 [J]. | 电子显微学报 , 2021 , 40 (2) : 101-107 . |
| MLA | 韦如建 et al. "纳米Ir薄膜中缺陷结构的原子尺度研究" . | 电子显微学报 40 . 2 (2021) : 101-107 . |
| APA | 韦如建 , 贺昕 , 王兴权 , 熊晓东 , 罗俊锋 , 闻明 et al. 纳米Ir薄膜中缺陷结构的原子尺度研究 . | 电子显微学报 , 2021 , 40 (2) , 101-107 . |
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摘要 ：
为探究城市韧性恢复能力与空间形态特征的关系,选取长江中下游地区的20个城市作为研究对象,利用17个韧性评价指标和3个空间形态指标构建评价体系.通过因子分析提取6个韧性评价指标公共因子,利用FCM聚类算法将20个城市划分为4个等级,并分析不同等级城市的空间形态特征.研究发现:城市韧性恢复能力与空间形态特征之间存在相关关系;一级至四级韧性城市的紧凑度递减、形状分维数递增、信息熵相近.这说明城市构成要素的布局越紧凑,不同功能用地的规划越合理,韧性恢复能力越强;同时,城市韧性恢复能力越强,其避难场所、交通网络、生命线工程等设施的规划建设越合理,越能优化城市空间形态特征.
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| GB/T 7714 | 王丽华 , 马东辉 . 城市韧性恢复能力与空间形态特征相互关系研究 [J]. | 武汉理工大学学报（信息与管理工程版） , 2021 , 43 (3) : 197-202 . |
| MLA | 王丽华 et al. "城市韧性恢复能力与空间形态特征相互关系研究" . | 武汉理工大学学报（信息与管理工程版） 43 . 3 (2021) : 197-202 . |
| APA | 王丽华 , 马东辉 . 城市韧性恢复能力与空间形态特征相互关系研究 . | 武汉理工大学学报（信息与管理工程版） , 2021 , 43 (3) , 197-202 . |
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