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学者姓名：毛圣成
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| GB/T 7714 | Wang, Li , Li, Jintao , Zhang, Na et al. Investigations of EGFR configurations on tumor cell surface by high-resolution electron microscopy (vol 532, pg 179, 2020) [J]. | BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS , 2021 , 558 : 239-239 . |
| MLA | Wang, Li et al. "Investigations of EGFR configurations on tumor cell surface by high-resolution electron microscopy (vol 532, pg 179, 2020)" . | BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS 558 (2021) : 239-239 . |
| APA | Wang, Li , Li, Jintao , Zhang, Na , Zhang, Xiaofei , Xia, Yang , Chai, Binbin et al. Investigations of EGFR configurations on tumor cell surface by high-resolution electron microscopy (vol 532, pg 179, 2020) . | BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS , 2021 , 558 , 239-239 . |
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摘要 ：
Revealing the atomistic mechanisms for the high-temperature mechanical behavior of materials is important for optimizing their properties for service at high-temperatures and their thermomechanical processing. However, due to materials microstructure's dynamic recovery and the absence of available in situ techniques, the high-temperature deformation behavior and atomistic mechanisms of materials are difficult to evaluate. Here, we report the development of a microelectromechanical systems-based thermomechanical testing apparatus that enables mechanical testing at temperatures reaching 1556 K inside a transmission electron microscope for in situ investigation with atomic-resolution. With this unique technique, we first uncovered that tungsten fractures at 973 K in a ductile manner via a strain-induced multi-step body-centered cubic (BCC)-to-face-centered cubic (FCC) transformation and dislocation activities within the strain-induced FCC phase. Both events reduce the stress concentration at the crack tip and retard crack propagation. Our research provides an approach for timely and atomic-resolved high-temperature mechanical investigation of materials at high-temperatures.
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| GB/T 7714 | Zhang Jianfei , Li Yurong , Li Xiaochen et al. Timely and atomic-resolved high-temperature mechanical investigation of ductile fracture and atomistic mechanisms of tungsten. [J]. | Nature communications , 2021 , 12 (1) : 2218 . |
| MLA | Zhang Jianfei et al. "Timely and atomic-resolved high-temperature mechanical investigation of ductile fracture and atomistic mechanisms of tungsten." . | Nature communications 12 . 1 (2021) : 2218 . |
| APA | Zhang Jianfei , Li Yurong , Li Xiaochen , Zhai Yadi , Zhang Qing , Ma Dongfeng et al. Timely and atomic-resolved high-temperature mechanical investigation of ductile fracture and atomistic mechanisms of tungsten. . | Nature communications , 2021 , 12 (1) , 2218 . |
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摘要 ：
Body-centered-cubic (BCC) refractory high-entropy alloys (RHEAs) are being actively pursued due to their potential to outperform existing superalloys at elevated temperatures. One bottleneck problem, however, is that these RHEAs lack tensile ductility and, hence, processability at room temperature. The strategy previously invoked to sustain ductility in high-strength HEAs is to manage dislocation movements via incorporating dispersed obstacles; this, however, may also have embrittlement ramifications. Here, a new strategy is demonstrated to achieve ductile BCC HfNbTiV, via decomposing the BCC arrangement (β phase) into a β(BCC1) + β∗(BCC2) arrangement via spinodal decomposition, producing chemical composition modulations and, more importantly, elastic strain on a length scale of a few tens of nanometers. The periodically spaced β∗, with large lattice distortion, is particularly potent in heightening the ruggedness of the terrain for the passage of dislocations. This makes the motion of dislocations sluggish, causing a traffic jam and cross-slip, facilitating dislocation interactions, multiplication, and accumulation. Wavy dislocations form walls that entangle with slip bands, promoting strain hardening and delocalizing plastic strain. A simultaneous combination of high yield strength (1.1 GPa) and tensile strain to failure (28%) is achieved; these values are among the best reported so far for refractory high-entropy alloys. © The Royal Society of Chemistry.
关键词 ：
Ductility Ductility Entropy Entropy High-entropy alloys High-entropy alloys Refractory alloys Refractory alloys Spinodal decomposition Spinodal decomposition Strain hardening Strain hardening Superalloys Superalloys Tensile strain Tensile strain Traffic congestion Traffic congestion
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| GB/T 7714 | An, Zibing , Mao, Shengcheng , Yang, Tao et al. Spinodal-modulated solid solution delivers a strong and ductile refractory high-entropy alloy [J]. | Materials Horizons , 2021 , 8 (3) : 948-955 . |
| MLA | An, Zibing et al. "Spinodal-modulated solid solution delivers a strong and ductile refractory high-entropy alloy" . | Materials Horizons 8 . 3 (2021) : 948-955 . |
| APA | An, Zibing , Mao, Shengcheng , Yang, Tao , Liu, Chain Tsuan , Zhang, Bin , Ma, Evan et al. Spinodal-modulated solid solution delivers a strong and ductile refractory high-entropy alloy . | Materials Horizons , 2021 , 8 (3) , 948-955 . |
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摘要 ：
This study explored a multi-mechanism approach to improving the mechanical properties of a CoCrFeMnNi high-entropy alloy through non-equiatomic alloy design and processing. The alloy design ensures a single-phase face-centered cubic structure while lowering the stacking fault energy to encourage the formation of deformation twins and stacking faults by altering the equiatomic composition of the alloy. The processing strategy applied helped create a hierarchical grain size gradient microstructure with a high nanotwins population. This was achieved by means of rotationally accelerated shot peening (RASP). The non-equiatomic CoCrFeMnNi high-entropy alloy achieved a yield strength of 750 MPa, a tensile strength of 1050 MPa, and tensile uniform elongation of 27.5%. The toughness of the alloy was 2.53 x 10(10) kJ/m(3), which is about 2 times that of the same alloy without the RASP treatment. The strength increase is attributed to the effects of grain boundary strengthening, dislocation strengthening, twin strengthening, and hetero-deformation strengthening associated with the heterogeneous microstructure of the alloy. The concurrent occurrence of the multiple deformation mechanisms, i.e., dislocation deformation, twining deformation and microband deformation, contributes to achieving a suitable strain hardening of the alloy that helps to prevent early necking and to assure steady plastic deformation for high toughness. (C) 2021 Published by Elsevier Ltd on behalf of Chinese Society for Metals.
关键词 ：
Deformation mechanism Deformation mechanism Gradient and hierarchical structure Gradient and hierarchical structure High entropy alloy High entropy alloy Mechanical property Mechanical property
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| GB/T 7714 | An, Zibing , Mao, Shengcheng , Liu, Yinong et al. Hierarchical grain size and nanotwin gradient microstructure for improved mechanical properties of a non-equiatomic CoCrFeMnNi high-entropy alloy [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2021 , 92 : 195-207 . |
| MLA | An, Zibing et al. "Hierarchical grain size and nanotwin gradient microstructure for improved mechanical properties of a non-equiatomic CoCrFeMnNi high-entropy alloy" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 92 (2021) : 195-207 . |
| APA | An, Zibing , Mao, Shengcheng , Liu, Yinong , Zhou, Hao , Zhai, Yadi , Tian, Zhiyong et al. Hierarchical grain size and nanotwin gradient microstructure for improved mechanical properties of a non-equiatomic CoCrFeMnNi high-entropy alloy . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2021 , 92 , 195-207 . |
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摘要 ：
The high-temperature oxidation behaviours of AlxHfMoNbTi-series refractory high-entropy alloys with an Al content ranging from 0 to 20 at.% (x=0-1) were tested at 700-1000 degrees C. An in situ oxidation experiment was performed at 25-900 degrees C using environmental transmission electron microscopy (ETEM) to reveal the oxidation mechanism. The addition of Al to the HfMoNbTi alloy effectively increased the alloy strength and hardness. The improvement in oxidation resistance by Al addition is attributed to the formation of mixed oxide structures instead of layered oxides. Mo-rich precipitates are preferentially oxidized, and their volatilization at the metal/ oxide interface accelerates alloy oxidation.
关键词 ：
Al addition Al addition Environmental TEM Environmental TEM In situ In situ Oxidation Oxidation Refractory high-entropy alloy Refractory high-entropy alloy
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| GB/T 7714 | Yang, Xiaomeng , An, Zibing , Zhai, Yadi et al. Effect of Al content on the thermal oxidation behaviour of AlHfMoNbTi high-entropy alloys analysed by in situ environmental TEM [J]. | CORROSION SCIENCE , 2021 , 191 . |
| MLA | Yang, Xiaomeng et al. "Effect of Al content on the thermal oxidation behaviour of AlHfMoNbTi high-entropy alloys analysed by in situ environmental TEM" . | CORROSION SCIENCE 191 (2021) . |
| APA | Yang, Xiaomeng , An, Zibing , Zhai, Yadi , Wang, Xin , Chen, Yanhui , Mao, Shengcheng et al. Effect of Al content on the thermal oxidation behaviour of AlHfMoNbTi high-entropy alloys analysed by in situ environmental TEM . | CORROSION SCIENCE , 2021 , 191 . |
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摘要 ：
Previous molecular simulations and experiments suggest that grain boundaries (GBs) serve as dislocation sources in nanocrystalline metals. Although a large number of studies have been carried out, direct experimental evidence of dislocation nucleation from GBs has rarely been achieved. In this work, we performed in situ transmission electron microscopy (TEM) observations for a Pt nanocrystalline film with an average grain size of -10 nm during tensile deformation. This study revealed direct evidence of dislocation nucleation at the GBs at the atomic scale. This is different from the common hypothesis predicted by molecular dynamic simulations that only partial dislocations are emitted from GBs in small-grained structures.
关键词 ：
Dislocations Dislocations Grain boundary-mediated plasticity Grain boundary-mediated plasticity Nanocrystalline metal Nanocrystalline metal Transmission electron microscopy Transmission electron microscopy
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| GB/T 7714 | Li, Xiaochen , Long, Haibo , Zhang, Jianfei et al. Direct observation of the grain boundaries acting as dislocation sources in nanocrystalline platinum [J]. | MATERIALS CHARACTERIZATION , 2021 , 181 . |
| MLA | Li, Xiaochen et al. "Direct observation of the grain boundaries acting as dislocation sources in nanocrystalline platinum" . | MATERIALS CHARACTERIZATION 181 (2021) . |
| APA | Li, Xiaochen , Long, Haibo , Zhang, Jianfei , Ma, Dongfeng , Kong, Deli , Lu, Yan et al. Direct observation of the grain boundaries acting as dislocation sources in nanocrystalline platinum . | MATERIALS CHARACTERIZATION , 2021 , 181 . |
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摘要 ：
Developing high performance n-type thermoelectric (TE) materials is fundamentally important for developing high efficiency TE devices. AgBiSe2, which reveals superior n-type TE performance in a cubic phase, crystallizes in a hexagonal phase at room temperature, and typically, undergoes phase transitions to a cubic phase at a temperature above 580 K. Here, for the first time, through entropy optimization with lead-selenides (≥9.9 mol%), the high-temperature cubic phase of AgBiSe2 is stabilized from 300 to 800 K. Furthermore, the AgBiSe2-PbSe pseudo-binary diagram is established. The resultant alloys with optimized entropy possess unique local distorted cubic lattices, which contribute low lattice thermal conductivity approaching 0.3 W m−1 K−1 in extended operating temperature range. Consequently, a peak figure of merit zT value of ≈0.8 at 800 K and a record-high average zT value of 0.42 for n-type I-V-VI2 compounds are attained in pure phase cubic n-type (AgBiSe2)1−x(PbSe)x solid solutions. These results pave the way for developing new TE materials via entropy engineering. © 2020 Wiley-VCH GmbH
关键词 ：
Bismuth alloys Bismuth alloys Entropy Entropy IV-VI semiconductors IV-VI semiconductors Lead compounds Lead compounds Phase diagrams Phase diagrams Selenium compounds Selenium compounds Silver alloys Silver alloys Temperature Temperature Thermal conductivity Thermal conductivity Thermoelectricity Thermoelectricity
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| GB/T 7714 | Zhu, Huaxing , Zhao, Ting , Zhang, Bin et al. Entropy Engineered Cubic n-Type AgBiSe2 Alloy with High Thermoelectric Performance in Fully Extended Operating Temperature Range [J]. | Advanced Energy Materials , 2021 , 11 (5) . |
| MLA | Zhu, Huaxing et al. "Entropy Engineered Cubic n-Type AgBiSe2 Alloy with High Thermoelectric Performance in Fully Extended Operating Temperature Range" . | Advanced Energy Materials 11 . 5 (2021) . |
| APA | Zhu, Huaxing , Zhao, Ting , Zhang, Bin , An, Zibing , Mao, Shengcheng , Wang, Guoyu et al. Entropy Engineered Cubic n-Type AgBiSe2 Alloy with High Thermoelectric Performance in Fully Extended Operating Temperature Range . | Advanced Energy Materials , 2021 , 11 (5) . |
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摘要 ：
This paper reports a synergistic design of high-performance BCC high-entropy alloy based on the combined consideration of the principles of intrinsic ductility of elements, maximum atomic size difference for solid solution strengthening and the valence electron concentration criterion for ductility. The single-phase BCC HfNbTaTiV alloy thus designed exhibited a high compressive yield strength of 1350 MPa and a high compressive ductility of >45 % at the room temperature. This represents a 50 % increase in yield strength relative to a HfNbTaTiZr alloy. This is attributed to the maximized solid solution strengthening effect caused by lattice distortion, which is estimated to be 1094 MPa. The alloy was also able to retain 53 % of its yield strength and 77 % of its ductility at 700 degrees C. These properties are superior to those of most refractory BCC high-entropy alloys reported in the literature. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
关键词 ：
High-entropy alloy High-entropy alloy Mechanical properties Mechanical properties Solid solution strengthening Solid solution strengthening Strengthening mechanism Strengthening mechanism
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| GB/T 7714 | An, Zibing , Mao, Shengcheng , Liu, Yinong et al. A novel HfNbTaTiV high-entropy alloy of superior mechanical properties designed on the principle of maximum lattice distortion [J]. | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2021 , 79 : 109-117 . |
| MLA | An, Zibing et al. "A novel HfNbTaTiV high-entropy alloy of superior mechanical properties designed on the principle of maximum lattice distortion" . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY 79 (2021) : 109-117 . |
| APA | An, Zibing , Mao, Shengcheng , Liu, Yinong , Wang, Li , Zhou, Hao , Gan, Bin et al. A novel HfNbTaTiV high-entropy alloy of superior mechanical properties designed on the principle of maximum lattice distortion . | JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY , 2021 , 79 , 109-117 . |
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摘要 ：
Understanding the high-temperature initial oxidation mechanism and its dynamic processes is generally important because a small amount of initial oxidation can induce rapid corrosion and cause catastrophic failure. We reveal the mechanism of initial oxidation in a third-generation Ni-based superalloy by in situ visualizations and investigations of the nano- and atomic-scale dynamic processes from room temperature to 900 degrees C with a Cs-corrected environmental transmission electron microscope. The initial oxidation starts from the gamma/gamma' interface at low temperatures. The high-temperature oxidation process with deficient oxygen prefers oxidation sites at the cross-junctions of the gamma/gamma' interfaces. The growth rate of the oxide nanoparticles depends on the oxidation temperatures, with a low rate below 600 degrees C and a rapid-growth speed at temperatures higher than 700 degrees C. Mass transfer from the gamma' and gamma phases to the gamma/gamma' interface, particularly at the cross-junctions of these interfaces, is observed to cause oxide accumulation. This study provides a direct observation of the interphase, interface-junction-initiated outward oxidization including Al and Cr elements. These results shed light on the initial oxidation mechanisms of materials containing a second phase with interphase interfaces and the materials at deficient oxygen conditions as well as those with protection coating layers. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词 ：
Dynamic mechanism Dynamic mechanism Interface Interface Junction Junction Nickel-based superalloy Nickel-based superalloy Oxidation Oxidation
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| GB/T 7714 | Zhai, Yadi , Chen, Yanhui , Zhao, Yunsong et al. Initial oxidation of Ni-based superalloy and its dynamic microscopic mechanisms: The interface junction initiated outwards oxidation [J]. | ACTA MATERIALIA , 2021 , 215 . |
| MLA | Zhai, Yadi et al. "Initial oxidation of Ni-based superalloy and its dynamic microscopic mechanisms: The interface junction initiated outwards oxidation" . | ACTA MATERIALIA 215 (2021) . |
| APA | Zhai, Yadi , Chen, Yanhui , Zhao, Yunsong , Long, Haibo , Li, Xueqiao , Deng, Qingsong et al. Initial oxidation of Ni-based superalloy and its dynamic microscopic mechanisms: The interface junction initiated outwards oxidation . | ACTA MATERIALIA , 2021 , 215 . |
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摘要 ：
Oxygen-affected cracking commonly presents on thin Ni-based single crystal superalloy components serving in high temperature and oxidizing environments. This study uses a newly developed in-situ thermal-stress environmental transmission electron microscope to investigate the oxidation and fracture behaviors of Ni-based single crystal superalloy at 650 degrees C under stress. The in-situ oxidation was found to change the tensile fracture mode from the close-packed {111} planes of plastic fracture to {001} planes adjacent to gamma/gamma ' interfaces of brittle fracture. The microanalysis also revealed that the gamma ' cuboids, gamma phase, and gamma/gamma interface exhibit different oxidation behavior, thus underscoring the thickness debit effect. [GRAPHICS] .
关键词 ：
environment-assisted cracking environment-assisted cracking in-situ transmission electron microscopy in-situ transmission electron microscopy Ni-based superalloys Ni-based superalloys oxidation oxidation
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| GB/T 7714 | Li, Xueqiao , Liu, Yinong , Zhao, Yunsong et al. Oxygen changes crack modes of Ni-based single crystal superalloy [J]. | MATERIALS RESEARCH LETTERS , 2021 , 9 (12) : 531-539 . |
| MLA | Li, Xueqiao et al. "Oxygen changes crack modes of Ni-based single crystal superalloy" . | MATERIALS RESEARCH LETTERS 9 . 12 (2021) : 531-539 . |
| APA | Li, Xueqiao , Liu, Yinong , Zhao, Yunsong , Chen, Yanhui , Li, Ang , Zhang, Jianfei et al. Oxygen changes crack modes of Ni-based single crystal superalloy . | MATERIALS RESEARCH LETTERS , 2021 , 9 (12) , 531-539 . |
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