Query：
学者姓名：王立华
Refining：
Year
Type
Indexed by
Source
Complex
Co-Author
Language
Clean All
Abstract ：
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。
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Wang, Zhanxin , Guo, Yizhong , Ma, Yan et al. Effects of twin thicknesses on incoherent twin-boundary structures in face-centered cubic metals [J]. | SCIENCE CHINA-MATERIALS , 2023 , 66 (11) : 4342-4348 . |
| MLA | Wang, Zhanxin et al. "Effects of twin thicknesses on incoherent twin-boundary structures in face-centered cubic metals" . | SCIENCE CHINA-MATERIALS 66 . 11 (2023) : 4342-4348 . |
| APA | Wang, Zhanxin , Guo, Yizhong , Ma, Yan , Yang, Chengpeng , Zhai, Yadi , Yan, Xin et al. Effects of twin thicknesses on incoherent twin-boundary structures in face-centered cubic metals . | SCIENCE CHINA-MATERIALS , 2023 , 66 (11) , 4342-4348 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
Permanent structural changes in pure metals that are caused by plastic activity are normally irreparable after unloading. Because of the lack of experimental evidence, it is unclear whether the plastic activity can be repaired as the size of the pure metals decreases to several nanometers; it is also unclear how the metals accommodate the plastic deformation. In this study, the in situ atomic-scale loading and unloading of similar to 2 nm Ag nanocrystals was investigated, and three modes of plastic deformation were observed: (i) the phase transition from the face-centered cubic (fcc) phase to the hexagonal close-packed (hcp) phase, (ii) stacking faults, and (iii) deformation twin nucleation. We show that all three modes resulted in structural changes that were reparable, and their generation and restoration during loading and unloading were observed in situ. We discovered that the deformation modes of nanosized metals can be predicted from the ratio of the energy barriers of the fcc-hcp phase transition (Delta gamma(H)) and the deformation twin nucleation (Delta gamma(T)), which differ from those of the theoretical modes of relatively large-sized metals. The proposed Delta gamma(H)/Delta gamma(T) criterion provides insights into the deformation mechanism of nanometals.
Keyword ：
atomic-scale atomic-scale phasetransition phasetransition stacking faults stacking faults in situ in situ reparable deformation reparable deformation deformationtwin deformationtwin
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Li, Dongwei , Wang, Zhanxin , Zhao, Yufeng et al. In Situ Atomic-Scale Quantitative Evidence of Plastic Activities Resulting in Reparable Deformation in Ultrasmall-Sized Ag Nanocrystals [J]. | ACS NANO , 2023 , 17 (23) : 23488-23497 . |
| MLA | Li, Dongwei et al. "In Situ Atomic-Scale Quantitative Evidence of Plastic Activities Resulting in Reparable Deformation in Ultrasmall-Sized Ag Nanocrystals" . | ACS NANO 17 . 23 (2023) : 23488-23497 . |
| APA | Li, Dongwei , Wang, Zhanxin , Zhao, Yufeng , Zeng, Weijing , Zhang, Zihao , Li, Shuai et al. In Situ Atomic-Scale Quantitative Evidence of Plastic Activities Resulting in Reparable Deformation in Ultrasmall-Sized Ag Nanocrystals . | ACS NANO , 2023 , 17 (23) , 23488-23497 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
Understanding the plastic behavior of crack tips is crucial for improving the fracture toughness of nanometals. Although many studies are carried out, most previous studies focus on pure metals, and how the crack tip accommodates the plastic deformation of highly concentrated solid-solution alloys is unclear owing to a lack of direct atomic-scale evidence. In this study, the atomic-scale plastic behavior of the crack tip in face-centered cubic (FCC) AuCu alloy nanocrystals is observed in situ, which provides direct evidence that plastic deformation is governed by the generation of deformation twins and hexagonal close-packed (HCP) 2H and 4H phases, recurrence of reversible FCC-HCP phase transitions, and detwinning, which are rarely observed in pure metals. This unusual behavior originates from the inherent chemical inhomogeneity of the AuCu alloy, which inhibits twin thickening via partial dislocations on the adjacent plane, instead of random generation of deformation twins, phase transitions, and reversible processes. This naturally implies a similar behavior at the crack tip in other highly concentrated solid-solution alloys, including high-medium-entropy alloys, providing important insights that greatly improve the understanding of the fracture toughness of metallic materials. Several unconventional and seldom-reported deformation modes are observed at the crack tip of AuCu alloy nanocrystals, including the random generation of hexagonal close-packed (HCP) 2H and 4H phases, recurrence of the reversible face-centered cubic-HCP phase transition, and nanotwins (T), which originates from the chemical inhomogeneity induced by the solid-solution atoms in the AuCu alloy.image
Keyword ：
phase transition phase transition chemical inhomogeneity chemical inhomogeneity crack tip crack tip deformation twin deformation twin in situ in situ
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Yang, Chengpeng , Fu, Libo , Ma, Yan et al. In Situ Atomic-Scale Evidence of Unconventional Plastic Behavior at The Crack Tip in AuCu Nanocrystals [J]. | ADVANCED FUNCTIONAL MATERIALS , 2023 , 34 (4) . |
| MLA | Yang, Chengpeng et al. "In Situ Atomic-Scale Evidence of Unconventional Plastic Behavior at The Crack Tip in AuCu Nanocrystals" . | ADVANCED FUNCTIONAL MATERIALS 34 . 4 (2023) . |
| APA | Yang, Chengpeng , Fu, Libo , Ma, Yan , Wang, Zhanxin , Li, Dongwei , Shao, Ruiwen et al. In Situ Atomic-Scale Evidence of Unconventional Plastic Behavior at The Crack Tip in AuCu Nanocrystals . | ADVANCED FUNCTIONAL MATERIALS , 2023 , 34 (4) . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
The deformation of a single-crystal Fe48Mn32Co10Cr10 alloy is captured in situ at the atomic scale. The results show that full and partial dislocations, along with deformation twins, are involved in the deformation process. Partial dislocation activities result in the formation of nanotwins, high-density coherent twin boundaries, and incoherent twin boundaries. Full dislocations interact with the coherent/incoherent twin boundaries, and partial dislocations, thereby producing high strength and remarkable strain hardening. The observed high activity of full dislocations can be attributed to the inhomogeneous distribution of solid solution atoms in the alloy.{GRAPHICAL ABSTRACT}
Keyword ：
in-situ in-situ deformation twin deformation twin dislocation dislocation High-entropy alloys High-entropy alloys
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Ma, Yan , Qiu, Keliang , Xu, Ning et al. In-situ atomic-scale observation of dislocation and deformation twin interaction in FeMnCoCr high-entropy alloy [J]. | MATERIALS RESEARCH LETTERS , 2023 , 11 (12) : 1040-1047 . |
| MLA | Ma, Yan et al. "In-situ atomic-scale observation of dislocation and deformation twin interaction in FeMnCoCr high-entropy alloy" . | MATERIALS RESEARCH LETTERS 11 . 12 (2023) : 1040-1047 . |
| APA | Ma, Yan , Qiu, Keliang , Xu, Ning , Yang, Chengpeng , Zhang, Jiabao , Zhang, Zihao et al. In-situ atomic-scale observation of dislocation and deformation twin interaction in FeMnCoCr high-entropy alloy . | MATERIALS RESEARCH LETTERS , 2023 , 11 (12) , 1040-1047 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
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.
Keyword ：
Band alignment Band alignment Carbon nitride Carbon nitride Quantum dots Quantum dots H2O2 H2O2 Homojunction Homojunction
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
A detailed monitoring of atomic-scale processes accomplishing grain rotation is important for understanding the deformation mechanisms in nanocrystalline metals. However, direct observations have been rare thus far, such that our knowledge about grain rotation has to rely heavily on hypothetical models and simulations. Here, we present in situ atomic-resolution evidence, indicating that the atomic processes accomplishing grain rotation in nanocrystalline Pt depend on the type of grain boundary (GB) separating the rotating grains. The grains around general (mixed) GBs rotate via the Frank-Bilby dislocation activities together with atomic shuffling and disconnection activities, the former being the generation, climb, glide and reaction of GB dislocations, whereas the latter leading to GB migration accompanying the grain rotation. While for the grains with a tilt GB in between: their rotation is accomplished almost entirely via the Frank-Bilby dislocation activities. We also discover that the GB dislocation climb, glide, and reaction often involve the formation and destruction of Lomer-like dislocations. (c) 2022 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc.
Keyword ：
Atomic scale Atomic scale Plastic deformation Plastic deformation In situ transmission electron microscopy In situ transmission electron microscopy Dislocation Dislocation Grain boundary plasticity Grain boundary plasticity
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Guo, Yizhong , Teng, Jiao , Yang, Guo et al. In situ observation of atomic-scale processes accomplishing grain rotation at mixed grain boundaries [J]. | ACTA MATERIALIA , 2022 , 241 . |
| MLA | Guo, Yizhong et al. "In situ observation of atomic-scale processes accomplishing grain rotation at mixed grain boundaries" . | ACTA MATERIALIA 241 (2022) . |
| APA | Guo, Yizhong , Teng, Jiao , Yang, Guo , Li, Ang , Deng, Yao , Yang, Chengpeng et al. In situ observation of atomic-scale processes accomplishing grain rotation at mixed grain boundaries . | ACTA MATERIALIA , 2022 , 241 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
Understanding the deformation behavior of crack tips in metals is of great significance for improving fracture toughness. However, how crack tips in nanosized metallic alloys behave under loading is unclear, because most previous studies focused on pure metals. In this study, the atomic-scale deformation behavior of the crack tip in AuAg alloy nanocrystals was observed in situ. We revealed that the deformation mechanism near the crack tip depended on the distance from the tip. For the 'near region' close to the crack tip, plastic deformation was governed by partial dislocations, twinning, and their interactions. For the 'far region', further than -15 nm from the crack tip, full dislocations dominated, and their interactions resulted in Lomer-dislocation (LD) lock formation and destruction. We uncovered that the combination of blunting dislocation-twin interactions, twin-twin intersections, and formation and destruction of LD locks, as a previously unrecognized fracture toughness improvement mechanism in metals.
Keyword ：
Crack propagation Crack propagation Twinning Twinning In situ transmission electron microscopy In situ transmission electron microscopy Dislocation Dislocation AuAg nanocrystal alloy AuAg nanocrystal alloy
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | Yang, Chengpeng , Fu, Libo , Guo, Yizhong et al. In situ observation of distance dependence of the plasticity behavior of the crack tip in nanosized AuAg alloys [J]. | MATERIALS CHARACTERIZATION , 2022 , 194 . |
| MLA | Yang, Chengpeng et al. "In situ observation of distance dependence of the plasticity behavior of the crack tip in nanosized AuAg alloys" . | MATERIALS CHARACTERIZATION 194 (2022) . |
| APA | Yang, Chengpeng , Fu, Libo , Guo, Yizhong , Ma, Yan , Li, Dongwei , Wang, Zhanxin et al. In situ observation of distance dependence of the plasticity behavior of the crack tip in nanosized AuAg alloys . | MATERIALS CHARACTERIZATION , 2022 , 194 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
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。
Cite：
Copy from the list or Export to your reference management。
| 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 . |
| Export to | NoteExpress RIS BibTex |
Abstract ：
与传统块体金属材料相比，纳米金属材料具有更加优异的物理、化学性能，有着广泛的应用前景。然而，金属纳米材料在服役过程中易氧化，从而严重影响纳米器件的性能，加速器件老化，造成不可挽回的损失。理清金属材料氧化微观过程，提高材料的抗氧化能力是国家重大工程中的重大问题，也是科学家和研究人员研究的重点。过去传统的氧化机制研究大多局限于微米尺度多层氧化膜的形成机制、形成序列、形成原因等因素，缺少对金属材料原位原子尺度动态氧化机制的研究。因此，研究金属纳米材料纳米尺度下的氧化过程，建立一个清晰的原子尺度氧化体系对提高材料抗氧化能力以及设计抗氧化材料的设计和优化具有重要意义。先进原位技术的出现使研究者能够从原子...
Keyword ：
原子尺度 原子尺度 氧化 氧化 金属 金属 原位 原位
Cite：
Copy from the list or Export to your reference management。
| GB/T 7714 | 裴星飞 , 王立华 , 陈艳辉 . 纳米金属材料原位氧化电子显微学研究进展 [J]. | 材料导报 , 2022 , 36 (S1) : 500-509 . |
| MLA | 裴星飞 et al. "纳米金属材料原位氧化电子显微学研究进展" . | 材料导报 36 . S1 (2022) : 500-509 . |
| APA | 裴星飞 , 王立华 , 陈艳辉 . 纳米金属材料原位氧化电子显微学研究进展 . | 材料导报 , 2022 , 36 (S1) , 500-509 . |
| Export to | NoteExpress RIS BibTex |
Export
| Results： |
Selected to |
| Format： |
