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学者姓名：毛圣成
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摘要 ：
Alloys with high yield strength and ductility are attractive for application because of their potential to offer mass reduction, energy savings, and enhanced structural reliability. However, increasing strength usually comes at the expense of ductility, which is commonly known as the strength-ductility trade-off for metal alloys. In this work, we explored a strategy of using a heterogeneous grain size structure and a reduced stacking fault energy in a CoCrFeNiMn FCC high entropy alloy to overcome the limitations of this trade-off. By this approach, the alloy achieved a yield strength of 980 MPa, a tensile strength of 1385 MPa, and tensile elongation to failure of 48% benefiting from cooperative strain hardening via multiple mech-anisms, such as hetero-deformation induced (HDI) hardening, deformation twinning, Frank-Read disloca-tion sources and Lomer-Cottrell dislocation locks instigated by such structures. These micromechanisms of deformation help to harden the alloy via in situ refinement of the mean free paths for dislocations.(c) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
关键词 ：
Hetero-deformation induced hardening Hetero-deformation induced hardening Strength and ductility Strength and ductility Heterogeneous structure Heterogeneous structure Strain hardening Strain hardening High -entropy alloy High -entropy alloy
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| GB/T 7714 | An, Zibing , Mao, Shengcheng , Liu, Yinong et al. Inherent and multiple strain hardening imparting synergistic ultrahigh strength and ductility in a low stacking faulted heterogeneous high-entropy alloy [J]. | ACTA MATERIALIA , 2023 , 243 . |
| MLA | An, Zibing et al. "Inherent and multiple strain hardening imparting synergistic ultrahigh strength and ductility in a low stacking faulted heterogeneous high-entropy alloy" . | ACTA MATERIALIA 243 (2023) . |
| APA | An, Zibing , Mao, Shengcheng , Liu, Yinong , Yang, Luyan , Vayyala, Ashok , Wei, Xiao et al. Inherent and multiple strain hardening imparting synergistic ultrahigh strength and ductility in a low stacking faulted heterogeneous high-entropy alloy . | ACTA MATERIALIA , 2023 , 243 . |
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摘要 ：
sigma and mu phases are two of the most common topological close-packed (TCP) phases in nickel-based single crystal superalloys, which are detrimental to the comprehensive properties of superalloys. It is universally acknowl-edged that Ru plays an important role in the precipitation of TCP, and its inhibiting effects on the nucleation and precipitation of mu phases have already been confirmed, but its effects on sigma phases remain vague. In this work, the types and area fractions of the TCP phases precipitated from 4 alloys with different compositions have been characterized. It is found that Ru has different effects on the precipitation of different types of TCP. With the help of density functional theory (DFT), the interface structures between sigma and matrix gamma are further studied, and on this basis, the effects of different solutes such as Ru on interface stability and electronic structure are discussed in detail. Ru, Re, W, Cr and Ta are able to enhance the interface stability, boosting the nucleation of sigma phase. Co is different, for it can reduce the interface stability and elevate the nucleation difficulty of sigma. Additionally, the distribution behaviors of solutes between sigma and gamma phases have been calculated, from which it can be found that the energies of solutes like Cr and Ru distributing in sigma are more stable than distributing inside gamma, and these solutes have the tendency to diffuse from gamma to sigma. These results reveal the effects of solutes like Ru on the precipitation of sigma phase in terms of interfacial stability and atomic diffusion, which provide a new understanding of Ru effects.
关键词 ：
Density functional theory Density functional theory Site occupancy Site occupancy Intermetallics Intermetallics Microstructure Microstructure Aero-engine components Aero-engine components Interfaces Interfaces
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| GB/T 7714 | Jin, Huixin , Zhang, Jianxin , Zhang, Wenyang et al. The effects of solutes like ruthenium on precipitation of Sigma phase and Sigma/gamma interface stability in Ni-based superalloys [J]. | INTERMETALLICS , 2023 , 152 . |
| MLA | Jin, Huixin et al. "The effects of solutes like ruthenium on precipitation of Sigma phase and Sigma/gamma interface stability in Ni-based superalloys" . | INTERMETALLICS 152 (2023) . |
| APA | Jin, Huixin , Zhang, Jianxin , Zhang, Wenyang , Zhang, Youjian , Mao, Shengcheng , Du, Yiqun et al. The effects of solutes like ruthenium on precipitation of Sigma phase and Sigma/gamma interface stability in Ni-based superalloys . | INTERMETALLICS , 2023 , 152 . |
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摘要 ：
本发明提供一种透射电镜用原位拉伸样品保护装置及其制备方法，包括设置在MEMS力学芯片上的第一搭载侧、第二搭载侧，还包括第一拉伸辅助件、第二拉伸辅助件和载物件；第一拉伸辅助件连接MEMS力学芯片的第一搭载侧，载物件两端分别连接第二拉伸辅助件和第二搭载侧；第一拉伸辅助件与第二拉伸辅助件相嵌套成勾套结构。本发明通过在MEMS力学芯片上搭载原料块，然后切割，得到第一拉伸辅助件、第二拉伸辅助件以及载物件，并且保证第一拉伸辅助件嵌套于第二拉伸辅助件内部，形成勾套结构，由于形成了载物件，使得整个勾套自由选材，可对一维、二维材料及块状材料拉伸；设置载物件，可有效防止样品在拉伸断裂后掉落，避免透射电镜被污染。
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| GB/T 7714 | 韩晓东 , 张家宝 , 张剑飞 et al. 透射电镜用原位拉伸样品保护装置及其制备方法 : CN202210674942.2[P]. | 2022-06-14 . |
| MLA | 韩晓东 et al. "透射电镜用原位拉伸样品保护装置及其制备方法" : CN202210674942.2. | 2022-06-14 . |
| APA | 韩晓东 , 张家宝 , 张剑飞 , 毛圣成 , 李志鹏 . 透射电镜用原位拉伸样品保护装置及其制备方法 : CN202210674942.2. | 2022-06-14 . |
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摘要 ：
本发明涉及高熵合金领域，具体涉及一种高温下兼具优秀力学性能和抗氧化的高熵合金及制备方法。所述高熵合金的化学式记为(HfNbTiV)100‑xAlx，其中X＝0～10。本发明的高熵合金在室温及高温下兼具高拉伸屈服强度、高拉伸塑性和抗氧化的优秀性能。当所述高熵合金中含有Al时，高熵合金在室温及高温下兼具高拉伸屈服强度、高拉伸塑性、抗氧化和低密度的优秀性能。其在航空航天，国防军事等重大领域具有较大的应用潜力。
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| GB/T 7714 | 毛圣成 , 安子冰 , 韩晓东 et al. 高温下兼具优秀力学性能和抗氧化的高熵合金及制备方法 : CN202210406782.3[P]. | 2022-04-18 . |
| MLA | 毛圣成 et al. "高温下兼具优秀力学性能和抗氧化的高熵合金及制备方法" : CN202210406782.3. | 2022-04-18 . |
| APA | 毛圣成 , 安子冰 , 韩晓东 , 张泽 . 高温下兼具优秀力学性能和抗氧化的高熵合金及制备方法 : CN202210406782.3. | 2022-04-18 . |
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摘要 ：
本实用新型提供了一种透射电镜原位气相温差芯片，包括上芯片和下芯片；所述上芯片和下芯片之间的四周封闭形成中空腔体；在所述中空腔体内，所述下芯片的上表面设有呈一字形依次排列的气体出口、第一加热区、第二加热区、第三加热区和气体进口；任一所述加热区内设有观察窗口，所述观察窗口下方设有贯穿所述下芯片的电子束视窗，所述电子束视窗内设有下薄膜窗口，所述上芯片中设有与所述下薄膜窗口相对应的上薄膜窗口。该透射电镜原位气相温差芯片的加热控温精准，成功与高压气场相耦合，多个加热区共同加热实现精准温度梯度的加载，同时能控制温度的快速响应，能够在气热双载荷下对透射电镜样品进行原位反应的高分辨率测量。
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| GB/T 7714 | 韩晓东 , 田志永 , 毛圣成 et al. 一种透射电镜原位气相温差芯片 : CN202220334196.8[P]. | 2022-02-18 . |
| MLA | 韩晓东 et al. "一种透射电镜原位气相温差芯片" : CN202220334196.8. | 2022-02-18 . |
| APA | 韩晓东 , 田志永 , 毛圣成 , 栗晓辰 , 马东锋 , 张剑飞 et al. 一种透射电镜原位气相温差芯片 : CN202220334196.8. | 2022-02-18 . |
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摘要 ：
本发明提供了一种透射电镜原位气相温差芯片，包括上芯片和下芯片；所述上芯片和下芯片之间的四周封闭形成中空腔体；在所述中空腔体内，所述下芯片的上表面设有呈一字形依次排列的气体出口、第一加热区、第二加热区、第三加热区和气体进口；任一所述加热区内设有观察窗口，所述观察窗口下方设有贯穿所述下芯片的电子束视窗，所述电子束视窗内设有下薄膜窗口，所述上芯片中设有与所述下薄膜窗口相对应的上薄膜窗口。该透射电镜原位气相温差芯片的加热控温精准，成功与高压气场相耦合，多个加热区共同加热实现精准温度梯度的加载，同时能控制温度的快速响应，能够在气热双载荷下对透射电镜样品进行原位反应的高分辨率测量。
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| GB/T 7714 | 韩晓东 , 田志永 , 毛圣成 et al. 一种透射电镜原位气相温差芯片 : CN202210151623.3[P]. | 2022-02-18 . |
| MLA | 韩晓东 et al. "一种透射电镜原位气相温差芯片" : CN202210151623.3. | 2022-02-18 . |
| APA | 韩晓东 , 田志永 , 毛圣成 , 栗晓辰 , 马东锋 , 张剑飞 et al. 一种透射电镜原位气相温差芯片 : CN202210151623.3. | 2022-02-18 . |
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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 ：
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 In situ In situ Oxidation Oxidation Refractory high-entropy alloy Refractory high-entropy alloy Environmental TEM Environmental TEM
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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 Nanocrystalline metal Nanocrystalline metal Grain boundary-mediated plasticity Grain boundary-mediated plasticity 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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