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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 ：
The plastic deformation of the material is called dynamic plastic deformation when the strain rate is higher than 102 s-1. In comparison with quasi-static plastic deformation, the dynamic plastic deformation involves highly localized deformation and more complex mechanisms which can have a significant impact on the properties and life of materials. As a special deformation structure in the process of dynamic plastic deformation, adiabatic shear band has attracted great attention because of its influence on material properties. Because of its excellent mechanical properties, titanium alloy is widely used in many industries as structural material. Because of its wide application, titanium alloy will often face failure caused by adiabatic shear band formation in dynamic load, so as to reduce and shorten the service life. Therefore, the study on the formation mechanism of adiaba-tic shear band in titanium alloy is of great significance to prolong the service life of titanium alloy and improve the mechanical properties of titanium alloy. However, due to the transient of dynamic plastic deformation and the complexity of internal stress, it is difficult to reappear the formation of adiabatic shear band. Meanwhile the complexity of the structure and the instability of phase in the process of deformation increase the difficulty of observing the adiabatic shear band in titanium alloy. Through a large number of experimental observation and simulation calculation, it is generally believed that the formation mechanism of adiaba-tic shear band in titanium alloy is dynamic recrystallization. At present, there are four mainstream viewpoints in the process of dynamic recrystallization, namely, traditional dynamic recrystallization, continuous dynamic recrystallization, twin dynamic recrystallization and phase transformation induced dynamic recrystallization.According to different dynamic recrystallization methods, the researchers established the basic deformation mo-del and theoretical basis, and found some experimental evidence. In this review, some typical research results reported in recent years dealing with the adiabatic shear bands about their morphology, properties and related formation mechanisms in titanium alloys subjected to dynamic plastic deformation are summarized. Typical formation mechanisms of adiabatic shear bands and related problems for titanium alloys are discussed so as to provide useful information for future research. © 2021, Materials Review Magazine. All right reserved.
Keyword ：
Titanium alloys Titanium alloys Dynamic recrystallization Dynamic recrystallization Shear bands Shear bands Strain rate Strain rate Dynamics Dynamics Plastic deformation Plastic deformation Dynamic loads Dynamic loads
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| GB/T 7714 | Huang, Zikun , Sun, Wei . Formation Mechanism of Adiabatic Shear Band in Dynamic Plastic Deformation of Titanium Alloy [J]. | Materials Reports , 2021 , 35 (3) : 03122-03128 . |
| MLA | Huang, Zikun et al. "Formation Mechanism of Adiabatic Shear Band in Dynamic Plastic Deformation of Titanium Alloy" . | Materials Reports 35 . 3 (2021) : 03122-03128 . |
| APA | Huang, Zikun , Sun, Wei . Formation Mechanism of Adiabatic Shear Band in Dynamic Plastic Deformation of Titanium Alloy . | Materials Reports , 2021 , 35 (3) , 03122-03128 . |
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Abstract ：
Patent similarity measurement, as one of the fundamental building blocks for patent analysis, is able to derive technical intelligence efficiently, but also can detect the risk of infringement and evaluate whether the invention meets the criteria of novelty and innovation. However, traditional approaches make implicitly several assumptions, such as bag of words in each component, semantic direction irrelevance and so on. In order to relax these assumptions, this study proposes an improved methodology on the basis of entities and semantic relations (functional and non-functional relations), which takes semantic direction of each sequence structure and the word order information of each component into consideration. Meanwhile, an algorithm for calculating the global importance of each sequence structure is put forward. Finally, to verify the effectiveness and performance of the improved semantic analysis, a case study is conducted on the thin film head subfield in the field of hard disk drive. Extensive experimental results show that our approach is significantly more accurate. © 2021 Elsevier Ltd.
Keyword ：
Semantics Semantics Risk assessment Risk assessment Magnetic thin film devices Magnetic thin film devices Patents and inventions Patents and inventions
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| GB/T 7714 | An, Xin , Li, Jinghong , Xu, Shuo et al. An improved patent similarity measurement based on entities and semantic relations [J]. | Journal of Informetrics , 2021 , 15 (2) . |
| MLA | An, Xin et al. "An improved patent similarity measurement based on entities and semantic relations" . | Journal of Informetrics 15 . 2 (2021) . |
| APA | An, Xin , Li, Jinghong , Xu, Shuo , Chen, Liang , Sun, Wei . An improved patent similarity measurement based on entities and semantic relations . | Journal of Informetrics , 2021 , 15 (2) . |
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Abstract ：
A unified viscoplastic constitutive model coupled with a physically-based damage variable, is proposed to capture the cyclic mechanical behavior and microstructural evolution of the material at elevated temperature. The mechanical strength can be reduced by the decrease in the dislocation density, the coarsening of the martensitic lath and the loss of the martensitic structure under cyclic loading. The proposed physically-based damage variable is driven by the evolutions of dislocation density and martensitic lath width. The good com-parisons with test results mean that the proposed model can reasonably model the cyclic elastic-viscoplastic constitutive behavior of the material at high temperature.
Keyword ：
Dislocation density Dislocation density High temperature fatigue High temperature fatigue Cyclic softening Cyclic softening Martensitic lath Martensitic lath Damage mechanics Damage mechanics
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| GB/T 7714 | Li, Dao-Hang , Li, Ming , Shang, De-Guang et al. Physically-based modeling of cyclic softening and damage behaviors for a martensitic turbine rotor material at elevated temperature [J]. | INTERNATIONAL JOURNAL OF FATIGUE , 2021 , 142 . |
| MLA | Li, Dao-Hang et al. "Physically-based modeling of cyclic softening and damage behaviors for a martensitic turbine rotor material at elevated temperature" . | INTERNATIONAL JOURNAL OF FATIGUE 142 (2021) . |
| APA | Li, Dao-Hang , Li, Ming , Shang, De-Guang , Gupta, Alok , Sun, Wei . Physically-based modeling of cyclic softening and damage behaviors for a martensitic turbine rotor material at elevated temperature . | INTERNATIONAL JOURNAL OF FATIGUE , 2021 , 142 . |
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Abstract ：
The 18R and 14H long-period stacking ordered (LPSO) phases were generally considered that only the basal and non-basal slips and kink banding could be activated during quasi-state deformation at room temperature. Here, we confirm that the pyramidal II slips can also be activated in the 18R LPSO phase by quasi-state nanoindentation and in the 14H LPSO phase by cold roll with a rolling direction parallel to the (0001) plane. Due to the interaction between the Zn6Y8 atomic clusters in the LPSO phases and the pyramidal II dislocations, the pyramidal II slips are localized in the well-defined slip bands while the chemically ordered structure of Zn6Y8 atomic clusters is disrupted to be disordered. Additionally, the interaction also induces Zn/Y atoms segregation at the two edges of the slip band. Our results unravel the origin for the excellent room temperature plasticity in the LPSO phases. © 2021 Elsevier Ltd
Keyword ：
Metal cladding Metal cladding Cold rolling Cold rolling Zinc alloys Zinc alloys Atoms Atoms Magnesium alloys Magnesium alloys Deformation Deformation Microstructure Microstructure Binary alloys Binary alloys Electron microscopy Electron microscopy Intermetallics Intermetallics
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| GB/T 7714 | Li, Wanpeng , Liu, Cuixiu , Liu, Linlin et al. Activation of pyramidal II slips at room temperature in Mg–Zn–Y 18R and 14H long-period stacking ordered phases [J]. | Intermetallics , 2021 , 135 . |
| MLA | Li, Wanpeng et al. "Activation of pyramidal II slips at room temperature in Mg–Zn–Y 18R and 14H long-period stacking ordered phases" . | Intermetallics 135 (2021) . |
| APA | Li, Wanpeng , Liu, Cuixiu , Liu, Linlin , Huang, Jacob C. , Sun, Wei . Activation of pyramidal II slips at room temperature in Mg–Zn–Y 18R and 14H long-period stacking ordered phases . | Intermetallics , 2021 , 135 . |
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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 ：
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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