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学者姓名：毛圣成
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摘要 ：
We report the sublimation and phase transformation mechanisms of a two-dimensional (2D) chalcogenide SnSb2Te4 using a lab-developed in-situ electro-thermal testing system on a Cs-corrected transmission electron microscope. It reveals that the sublimation process is primarily governed by the surface energy mechanism, following an anisotropic route. The van der Waals (vdW) layers ending with Te atoms lead to the preferential sublimation on (003) plane, with the (1 1 4) and (117) planes accommodating the sublimation. It is uncovered for the first time, that the preferential and accommodated sublimation of Te and Sb atoms along the vdW planes results in short-range diffusion inducing a phase transition from rhombohedral SnSb2Te4 to rock-salt (Sn1-xSbx) Te. These results highlight complex physics processes of 2D materials under service conditions and the route of atomic-resolved electro-thermal research platforms for investigations of complex atomistic mechanisms of 2D materials by thermal-electric external fields.
关键词 ：
Phase transition Phase transition In-situ TEM In-situ TEM SnSb2Te4 SnSb2Te4 Anisotropic sublimation Anisotropic sublimation
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| GB/T 7714 | Zhang, Qing , Wang, Menglong , Zhang, Jianfei et al. The anisotropic sublimation induces rhombohedral to rock-salt phase transformation of chalcogenide SnSb2Te4 two-dimensional nanomaterial [J]. | MATERIALS TODAY NANO , 2024 , 26 . |
| MLA | Zhang, Qing et al. "The anisotropic sublimation induces rhombohedral to rock-salt phase transformation of chalcogenide SnSb2Te4 two-dimensional nanomaterial" . | MATERIALS TODAY NANO 26 (2024) . |
| APA | Zhang, Qing , Wang, Menglong , Zhang, Jianfei , Ma, Dongfeng , Li, Wei , Wang, Kaiwen et al. The anisotropic sublimation induces rhombohedral to rock-salt phase transformation of chalcogenide SnSb2Te4 two-dimensional nanomaterial . | MATERIALS TODAY NANO , 2024 , 26 . |
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摘要 ：
Body-centred cubic refractory multi-principal element alloys (MPEAs), with several refractory metal elements as constituents and featuring a yield strength greater than one gigapascal, are promising materials to meet the demands of aggressive structural applications1-6. Their low-to-no tensile ductility at room temperature, however, limits their processability and scaled-up application7-10. Here we present a HfNbTiVAl10 alloy that shows remarkable tensile ductility (roughly 20%) and ultrahigh yield strength (roughly 1,390 megapascals). Notably, these are among the best synergies compared with other related alloys. Such superb synergies derive from the addition of aluminium to the HfNbTiV alloy, resulting in a negative mixing enthalpy solid solution, which promotes strength and favours the formation of hierarchical chemical fluctuations (HCFs). The HCFs span many length scales, ranging from submicrometre to atomic scale, and create a high density of diffusive boundaries that act as effective barriers for dislocation motion. Consequently, versatile dislocation configurations are sequentially stimulated, enabling the alloy to accommodate plastic deformation while fostering substantial interactions that give rise to two unusual strain-hardening rate upturns. Thus, plastic instability is significantly delayed, which expands the plastic regime as ultralarge tensile ductility. This study provides valuable insights into achieving a synergistic combination of ultrahigh strength and large tensile ductility in MPEAs. A HfNbTiVAl10 alloy shows tensile ductility and ultrahigh yield strength from the addition of aluminium to a HfNbTiV alloy, resulting in a negative mixing enthalpy solid solution, which promotes strength and favours formation of hierarchical chemical fluctuations.
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| GB/T 7714 | An, Zibing , Li, Ang , Mao, Shengcheng et al. Negative mixing enthalpy solid solutions deliver high strength and ductility [J]. | NATURE , 2024 , 625 (7996) . |
| MLA | An, Zibing et al. "Negative mixing enthalpy solid solutions deliver high strength and ductility" . | NATURE 625 . 7996 (2024) . |
| APA | An, Zibing , Li, Ang , Mao, Shengcheng , Yang, Tao , Zhu, Lingyu , Wang, Rui et al. Negative mixing enthalpy solid solutions deliver high strength and ductility . | NATURE , 2024 , 625 (7996) . |
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摘要 ：
Developing high-performance metallic materials with high yield strength and excellent ductility is important for various applications, such as automobiles, power plants, and aerospace industries. However, conventional alloys typically exhibit a trade-off between strength and ductility, making it difficult to develop materials that are both strong and ductile. In this study, we report that a cast Co-Cr-Fe-Ni-Al alloy can achieve a high room temperature yield strength of up to 500 MPa, which is twice that of conventional high-entropy alloys (HEAs) with face- centered cubic structures, with a tensile strain of 29 %. After thermomechanical treatment, the alloy exhibits even better synergy of strength and ductility, with a yield strength of 900 MPa and 30 % elongation. These exceptional mechanical properties are conferred by a multiscale hierarchical heterostructure, which was introduced through careful control of the alloy composition using a negative enthalpy alloy design strategy. The heterostructure ranges from the micrometer to sub-micrometer and nanometer scales. This multiscale hierarchical structure acts as a continuous impediment to dislocation motion, greatly increasing strength, and facilitating hetero-deformation induced hardening via strain partitioning, resulting in sustained ultrahigh strain hardening. Importantly, multiscale hierarchical heterostructures facilitate coordinated plastic deformation and multiple plastic deformation mechanisms, and stress concentration relieving, and play important roles in improving ductility. This work reveals the effect of different types (and scales) of heterogeneities on the deformation mechanism of HEAs and opens new perspectives for constructing heterostructures, which serve as a new design approach for high strength and excellent ductility by using a negative enthalpy alloy design strategy.
关键词 ：
Multiscale hierarchical heterostructure Multiscale hierarchical heterostructure Strength and ductility Strength and ductility Negative enthalpy alloy Negative enthalpy alloy Dislocation Dislocation Strain hardening Strain hardening
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| GB/T 7714 | An, Zibing , Mao, Shengcheng , Vayyala, Ashok et al. Multiscale hierarchical heterostructure yields combined high strength and excellent ductility in a Co-Cr-Fe-Ni-Al negative enthalpy alloy [J]. | ACTA MATERIALIA , 2024 , 281 . |
| MLA | An, Zibing et al. "Multiscale hierarchical heterostructure yields combined high strength and excellent ductility in a Co-Cr-Fe-Ni-Al negative enthalpy alloy" . | ACTA MATERIALIA 281 (2024) . |
| APA | An, Zibing , Mao, Shengcheng , Vayyala, Ashok , Yang, Luyan , Jiang, Cheng , Shi, Caijuan et al. Multiscale hierarchical heterostructure yields combined high strength and excellent ductility in a Co-Cr-Fe-Ni-Al negative enthalpy alloy . | ACTA MATERIALIA , 2024 , 281 . |
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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 ：
A Co30Cr20Fe18Mn18Ni11Si3 high-entropy alloy (HEA) with low stacking fault energy and high strengthen was designed based on the principle of heterostructure strengthening. The alloy was processed into a multiscale heterogeneous microstructure containing hierarchical twins. The alloy achieved an ultrahigh yield strength of 1500 MPa, ultimate tensile strength of 1750 MPa and a large ductility of 20 % at 77 K. These mechanical properties were superior to those of most FCC HEAs reported in the literature, breaking the strength-ductility trade-off of conventional metal alloys. Such extraordinary mechanical properties were attributed to a suitable strain hardening capability, stemming from the synergistic effect of hetero-deformation-induced hardening, twinning-induced plasticity, and deformation-induced phase transformation during tensile deformation.
关键词 ：
Hetero-deformation induced hardening Hetero-deformation induced hardening High -entropy alloy High -entropy alloy Mechanical properties Mechanical properties Heterogeneous structure Heterogeneous structure
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| GB/T 7714 | An, Zibing , Mao, Shengcheng , Jiang, Cheng et al. Achieving superior combined cryogenic strength and ductility in a high-entropy alloy via the synergy of low stacking fault energy and multiscale heterostructure [J]. | SCRIPTA MATERIALIA , 2023 , 239 . |
| MLA | An, Zibing et al. "Achieving superior combined cryogenic strength and ductility in a high-entropy alloy via the synergy of low stacking fault energy and multiscale heterostructure" . | SCRIPTA MATERIALIA 239 (2023) . |
| APA | An, Zibing , Mao, Shengcheng , Jiang, Cheng , Li, Ziyao , Wu, Shichang , Zhai, Yadi et al. Achieving superior combined cryogenic strength and ductility in a high-entropy alloy via the synergy of low stacking fault energy and multiscale heterostructure . | SCRIPTA MATERIALIA , 2023 , 239 . |
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摘要 ：
Eutectic high-entropy alloys (EHEAs) are gaining interest due to their excellent mechanical properties, superior liquidity and castability, and reduced compositional segregation. Here, we developed and successfully prepared Al19Co23Fe21Ni37 EHEA using vacuum arc melting. By adjusting the Co content and introducing V, we also obtained near-eutectic high entropy alloys (Al18Co27Fe20Ni35 and Al18Co22Fe20Ni35V5). The Al19Co23Fe21Ni37 and Al18Co27Fe20Ni35 alloys consist of alternating face-centered cubic (FCC) and ordered body-centered cubic (B2) phases, whereas the Al18Co22Fe20Ni35V5 alloy consists of FCC, ordered face-centered cubic (L12) and B2 phases. The heterostructure not only restricts dislocation motion but also induces significant hetero-deformation-induced hardening, resulting in a high-strain hardening effect. Furthermore, the high volume fraction of the hard B2 phase contributes to the increased strength of the alloy due to its high-stress partition relative to the other phases. As such, Al18Co22Fe20Ni35V5 alloy exhibits an excellent tensile ductility of 16.1%, yield strength of 571 MPa, and ultimate tensile strength of 1157 MPa.
关键词 ：
Mechanical properties Mechanical properties Heterostructure Heterostructure Hetero-deformation-induced (HDI) hardening Hetero-deformation-induced (HDI) hardening Eutectic high-entropy alloys Eutectic high-entropy alloys
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| GB/T 7714 | Wang, Xin , An, Zibing , Cai, Jixiang et al. Design of novel AlCoFeNiV high-entropy alloys with high-strength and high-ductility [J]. | MATERIALS CHARACTERIZATION , 2023 , 203 . |
| MLA | Wang, Xin et al. "Design of novel AlCoFeNiV high-entropy alloys with high-strength and high-ductility" . | MATERIALS CHARACTERIZATION 203 (2023) . |
| APA | Wang, Xin , An, Zibing , Cai, Jixiang , Jiang, Cheng , Su, Honghong , Luo, Xianmin et al. Design of novel AlCoFeNiV high-entropy alloys with high-strength and high-ductility . | MATERIALS CHARACTERIZATION , 2023 , 203 . |
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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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