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学者姓名：孙威
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Abstract ：
Multi-scale electron microscopy characterization of the {332}<113 > beta twins produced in the necking region near fracture surface of the deformed beta-type Ti-42Nb (wt%) alloy have been carried out. A unique kind of bandshaped zone with plenty of laths of two alpha '' martensitic subvariants distributed in about 90 degrees crossing directions has been found to be formed in the {332}<113 > beta deformation twin along the twin boundary. This finding clearly reveals that intense local stress concentration and its complex accommodation process associated with the beta-to-alpha '' and alpha ''-to-beta structural transitions can occur specially in the twinned region of stress-induced alpha '' martensite phase along its boundary for the beta Ti alloy subjected to instable deformation. It is also clearly indicated that the local stress accommodation due to the alpha"-to-beta structural transition can be unsymmetrical with respect to the twin boundary.
Keyword ：
Deformation structure Deformation structure Titanium alloys Titanium alloys Electron microscopy Electron microscopy Martensitic phase transformation Martensitic phase transformation Deformation twin Deformation twin
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| GB/T 7714 | Huang, Zikun , Sun, Wei . A unique kind of distribution band of martensitic laths formed along {332} (113) twin boundary in the Ti-42Nb alloy subjected to instable deformation [J]. | MATERIALS CHARACTERIZATION , 2024 , 218 . |
| MLA | Huang, Zikun 等. "A unique kind of distribution band of martensitic laths formed along {332} (113) twin boundary in the Ti-42Nb alloy subjected to instable deformation" . | MATERIALS CHARACTERIZATION 218 (2024) . |
| APA | Huang, Zikun , Sun, Wei . A unique kind of distribution band of martensitic laths formed along {332} (113) twin boundary in the Ti-42Nb alloy subjected to instable deformation . | MATERIALS CHARACTERIZATION , 2024 , 218 . |
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Abstract ：
In this paper, a new life assessment framework is proposed based on the elastic-viscoplastic modeling and the damage behavior for the structural component under multiaxial nonproportional loading at high temperature. The viscoplastic constitutive model with the ability to capture the non-proportional hardening effect is used to obtain the stress-strain fields, in which a new method based on the rotation of strain axis is proposed to evaluate the notch rotation factor. The damage model, which can comprehensively capture the multiaxial fatigue-oxidationcreep behaviors, is used to assess the failure life. In addition, the proposed framework is evaluated by the life results under proportional and non-proportional fatigue loadings at 650 degrees C, and the errors are found to be within a factor of 2.
Keyword ：
Multiaxial loading Multiaxial loading Elastic-viscoplastic Elastic-viscoplastic Non-proportional hardening Non-proportional hardening Fatigue-oxidation-creep damage Fatigue-oxidation-creep damage Notch Notch
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| GB/T 7714 | Li, Dao-Hang , Shang, De-Guang , Yin, Xiang et al. A novel fatigue-oxidation-creep life prediction method under non-proportional loading [J]. | ENGINEERING FAILURE ANALYSIS , 2022 , 131 . |
| MLA | Li, Dao-Hang et al. "A novel fatigue-oxidation-creep life prediction method under non-proportional loading" . | ENGINEERING FAILURE ANALYSIS 131 (2022) . |
| APA | Li, Dao-Hang , Shang, De-Guang , Yin, Xiang , Li, Ming , Chen, Feng , Sun, Guo-Qin et al. A novel fatigue-oxidation-creep life prediction method under non-proportional loading . | ENGINEERING FAILURE ANALYSIS , 2022 , 131 . |
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Abstract ：
A key challenge in photocatalysts is their rapid recombination of photo-generated elec-tron-hole pairs. To decrease the recombination probability, significant studies have been devoted to increasing potential active sites of photocatalytic systems for fast charge separation. Here we demonstrate a strategy to boost active sites that is different from conventional approaches, in which large-sized Mxene nanosheets were employed as co-catalysts, while small-sized CdS nanosheets were used as photocatalysts forming effec-tive nanocomposites. Based on our designed strategy, the enrichment of transfer routes guides the fast separation of electrons from CdS nanosheets and transferred onto large-sized Mxene nanosheets. The visible-light-driven hydrogen production of our innova-tively designed composites has been improved from 2.8 mmol/g of pure CdS nanosheets to 17.5 mmol/g of the CdS@Mxene optimized composite. The obvious improvement of hydrogen production verifies the feasibility of our design strategy as a unique way to our tactic here can be extended to the design of other kinds of photocatalytic systems.
Keyword ：
Improved hydrogen evolution Improved hydrogen evolution Booming active sites Booming active sites Small-sized photocatalyst Small-sized photocatalyst Fast charge separation Fast charge separation Large-sized cocatalyst Large-sized cocatalyst
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| GB/T 7714 | Zhang, Hang , Li, Yuanli , Li, Weiming et al. Designing large-sized cocatalysts for fast charge separation towards highly efficient visible-light-driven hydrogen evolution [J]. | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (56) : 28545-28553 . |
| MLA | Zhang, Hang et al. "Designing large-sized cocatalysts for fast charge separation towards highly efficient visible-light-driven hydrogen evolution" . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 46 . 56 (2021) : 28545-28553 . |
| APA | Zhang, Hang , Li, Yuanli , Li, Weiming , Zhuang, Chunqiang , Gao, Chunlang , Jiang, Wenshuai et al. Designing large-sized cocatalysts for fast charge separation towards highly efficient visible-light-driven hydrogen evolution . | INTERNATIONAL JOURNAL OF HYDROGEN ENERGY , 2021 , 46 (56) , 28545-28553 . |
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Abstract ：
A novel Fe-enriched lamella sandwich phase (χ-phase) has been found to precipitate along the basal (0001)Mg planes in the heat-treated Mg-Gd-Fe alloy and its structure is clearly revealed by means of atomic-resolution transmission electron microscopy. The layered χ-phase only has a thickness of mono-unit-cell and consists invariably of ten atomic layers stacking along the [0001]Mg direction, of which the outermost atomic layers had larger in-plane atom-pillar spacing than the inner layers. Fe/Gd atoms are mainly enriched in the outer four atomic layers in the χ-phase, forming two structurally unsymmetrical four-layer shells to sandwich the middle two Mg layers. An atomic model has been proposed for this layered sandwich-structured χ-phase. © 2021, Wuhan University of Technology and Springer-Verlag GmbH Germany, Part of Springer Nature.
Keyword ：
Iron alloys Iron alloys Magnesium alloys Magnesium alloys Precipitation (chemical) Precipitation (chemical) Iron metallography Iron metallography High resolution transmission electron microscopy High resolution transmission electron microscopy Ternary alloys Ternary alloys Atoms Atoms Gadolinium alloys Gadolinium alloys Magnesium metallography Magnesium metallography
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| GB/T 7714 | Liu, Linlin , Zheng, Yang , Liu, Cuixiu et al. A Novel Fe-enriched Lamella Sandwich Precipitate Formed in A Mg-Gd-Fe Alloy [J]. | Journal Wuhan University of Technology, Materials Science Edition , 2021 , 36 (1) : 111-115 . |
| MLA | Liu, Linlin et al. "A Novel Fe-enriched Lamella Sandwich Precipitate Formed in A Mg-Gd-Fe Alloy" . | Journal Wuhan University of Technology, Materials Science Edition 36 . 1 (2021) : 111-115 . |
| APA | Liu, Linlin , Zheng, Yang , Liu, Cuixiu , Sun, Wei . A Novel Fe-enriched Lamella Sandwich Precipitate Formed in A Mg-Gd-Fe Alloy . | Journal Wuhan University of Technology, Materials Science Edition , 2021 , 36 (1) , 111-115 . |
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Abstract ：
本文利用原子分辨的高角环形暗场扫描透射电镜(HADDF-STEM)成像技术并结合第一性原理计算的方法研究了Mg97 Gd2 Y1(at.％)合金200℃时效初期结构的形成和演变过程.结果表明,合金时效初期优先形成与富稀土原子柱近邻组合关联的各种纳米级细小富稀土团簇.这些由富稀土原子柱构建的团簇可以通过分解、重组而转变成β''''型局域网格状析出以及"之"字形G.P.区,进而形成β''相晶核.通过对具有典型构型的析出团簇形成能和结合能的计算,进一步验证了合金时效初期结构演变过程的合理性.
Keyword ：
结构演变 结构演变 析出 析出 高角环形暗场扫描透射电镜成像 高角环形暗场扫描透射电镜成像 Mg-Gd-Y合金 Mg-Gd-Y合金 时效初期结构 时效初期结构
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| GB/T 7714 | 刘林林 , 孙威 . Mg-Gd-Y合金时效初期析出结构的形成和演变 [J]. | 电子显微学报 , 2021 , 40 (1) : 18-26 . |
| MLA | 刘林林 et al. "Mg-Gd-Y合金时效初期析出结构的形成和演变" . | 电子显微学报 40 . 1 (2021) : 18-26 . |
| APA | 刘林林 , 孙威 . Mg-Gd-Y合金时效初期析出结构的形成和演变 . | 电子显微学报 , 2021 , 40 (1) , 18-26 . |
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Abstract ：
材料在应变速率高于10~2s_(-1)时的塑性变形被称为动态塑性变形。区别于准静态塑性变形,动态塑性变形涉及的复杂的高度局域化变形机制对材料的性能与寿命具有显著影响。绝热剪切带作为材料动态塑性变形过程中产生的特殊的变形结构,它对材料性能的影响引起了人们的高度关注。钛合金具有优良的力学性能,被用作结构材料,广泛应用于诸多行业,由于应用面广,钛合金会经常面临动态载荷产生绝热剪切带而失效,从而缩短使用寿命。因此,研究钛合金中绝热剪切带的形成机制对延长钛合金的使用寿命,改善钛合金的力学性能具有重要意义。然而,由于动态塑性变形的瞬时性、内部应力的复杂性等,还原绝热剪切带的形成过程具有相当大的难度。同时,...
Keyword ：
动态塑性变形 动态塑性变形 动态再结晶 动态再结晶 绝热剪切带 绝热剪切带 钛合金 钛合金
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| GB/T 7714 | 黄子坤 , 孙威 . 钛合金动态塑性变形过程中绝热剪切带的形成机理 [J]. | 材料导报 , 2021 , 35 (03) : 3122-3128 . |
| MLA | 黄子坤 et al. "钛合金动态塑性变形过程中绝热剪切带的形成机理" . | 材料导报 35 . 03 (2021) : 3122-3128 . |
| APA | 黄子坤 , 孙威 . 钛合金动态塑性变形过程中绝热剪切带的形成机理 . | 材料导报 , 2021 , 35 (03) , 3122-3128 . |
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Abstract ：
本文利用TEM、HRTEM、STEM-HAADF、FFT等多种表征技术,对室温轧制Mg-6Zn(wt.％)时效合金中β1''析出相结构予以表征与研究.结果表明:(1)合金中存在三种析出相,都与孪晶有交互作用;(2)首次从原子尺度上直接观察到β1''相在{10(1)2}孪晶内界面处的结构变化,显示该析出相在经过基体{10(1)2}孪生剪切作用后,在宏观形貌上产生了3.6°的偏转.这些结果为进一步研究、设计新的镁锌合金提供借鉴与参考.
Keyword ：
剪切相互作用 剪切相互作用 {10(1)2}孪晶 {10(1)2}孪晶 电子显微术 电子显微术 镁合金 镁合金 析出相 析出相
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| GB/T 7714 | 孙鹏阳 , 刘林林 , 孙威 et al. Mg-Zn合金中{10(1)2}孪生剪切与析出相相互作用结构的电子显微研究 [J]. | 电子显微学报 , 2021 , 40 (5) : 537-542 . |
| MLA | 孙鹏阳 et al. "Mg-Zn合金中{10(1)2}孪生剪切与析出相相互作用结构的电子显微研究" . | 电子显微学报 40 . 5 (2021) : 537-542 . |
| APA | 孙鹏阳 , 刘林林 , 孙威 , 刘翠秀 . Mg-Zn合金中{10(1)2}孪生剪切与析出相相互作用结构的电子显微研究 . | 电子显微学报 , 2021 , 40 (5) , 537-542 . |
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Abstract ：
本文利用TEM、HRTEM、STEM-HAADF、FFT等多种表征技术,对室温轧制Mg-6Zn (wt.%)时效合金中β_1′析出相结构予以表征与研究。结果表明:(1)合金中存在三种析出相,都与孪晶有交互作用;(2)首次从原子尺度上直接观察到β_1′相在■孪晶内界面处的结构变化,显示该析出相在经过基体■孪生剪切作用后,在宏观形貌上产生了3.6°的偏转。这些结果为进一步研究、设计新的镁锌合金提供借鉴与参考。
Keyword ：
■孪晶 ■孪晶 镁合金 镁合金 电子显微术 电子显微术 析出相 析出相 剪切相互作用 剪切相互作用
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| GB/T 7714 | 孙鹏阳 , 刘林林 , 孙威 et al. Mg-Zn合金中■孪生剪切与析出相相互作用结构的电子显微研究 [J]. | 电子显微学报 , 2021 , 40 (05) : 537-542 . |
| MLA | 孙鹏阳 et al. "Mg-Zn合金中■孪生剪切与析出相相互作用结构的电子显微研究" . | 电子显微学报 40 . 05 (2021) : 537-542 . |
| APA | 孙鹏阳 , 刘林林 , 孙威 , 刘翠秀 . Mg-Zn合金中■孪生剪切与析出相相互作用结构的电子显微研究 . | 电子显微学报 , 2021 , 40 (05) , 537-542 . |
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Abstract ：
The influence of B and Y on the microstructure, microsegregation, and tensile behaviour of the Ti45A18Nb0.2W0.25Cr (at%) alloy was investigated. The beta-stabilizer elements in the high-Nb TiAl alloy promote the formation of the gamma phase in the microsegregation region and lead to the formation of large blocky microsegregation areas. The large blocky microsegregation regions with low specific surface areas reduce the nucleation rate of cavities and cracks at the interfaces of the microsegregation, which are harmful to colony boundary strengthening and decrease tensile resistance. The addition of B and Y affords an obvious refinement in the lamellar colony, renders an increasing opportunity for cavity nucleation at the colony boundary, and thus improves the tensile resistance. The tensile mechanisms of the alloys before and after (B, Y) addition were also compared and analysed.
Keyword ：
TiAl TiAl microstructure microstructure microsegregation microsegregation tension tension
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| GB/T 7714 | Gong Ziqi , Wu Jin , Sun Wei et al. Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys [J]. | RARE METAL MATERIALS AND ENGINEERING , 2021 , 50 (8) : 2760-2764 . |
| MLA | Gong Ziqi et al. "Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys" . | RARE METAL MATERIALS AND ENGINEERING 50 . 8 (2021) : 2760-2764 . |
| APA | Gong Ziqi , Wu Jin , Sun Wei , Chen Ziyong , Nie Zuoren . Effects of B and Y Additions on the Microstructure and Tensile Behaviour of High-Nb TiAl Alloys . | RARE METAL MATERIALS AND ENGINEERING , 2021 , 50 (8) , 2760-2764 . |
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Abstract ：
Mg-Gd-Y合金时效初期析出结构的形成和演变
Keyword ：
时效初期结构 时效初期结构 结构演变 结构演变 MG-GD-Y合金 MG-GD-Y合金 析出 析出 高角环形暗场扫描透射电镜成像 高角环形暗场扫描透射电镜成像
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| GB/T 7714 | 刘林林 , 孙威 , 电子显微学报 . Mg-Gd-Y合金时效初期析出结构的形成和演变 [J]. | 刘林林 , 2021 , 40 (1) : 18-26 . |
| MLA | 刘林林 et al. "Mg-Gd-Y合金时效初期析出结构的形成和演变" . | 刘林林 40 . 1 (2021) : 18-26 . |
| APA | 刘林林 , 孙威 , 电子显微学报 . Mg-Gd-Y合金时效初期析出结构的形成和演变 . | 刘林林 , 2021 , 40 (1) , 18-26 . |
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