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学者姓名：孙威
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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 ：
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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Abstract ：
钛合金动态塑性变形过程中绝热剪切带的形成机理
Keyword ：
绝热剪切带 绝热剪切带 动态塑性变形 动态塑性变形 钛合金 钛合金 动态再结晶 动态再结晶
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| GB/T 7714 | 黄子坤 , 孙威 , 材料导报 . 钛合金动态塑性变形过程中绝热剪切带的形成机理 [J]. | 黄子坤 , 2021 , 35 (3) : 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" . | 黄子坤 35 . 3 (2021) : 3122-3128 . |
| APA | 黄子坤 , 孙威 , 材料导报 . 钛合金动态塑性变形过程中绝热剪切带的形成机理 . | 黄子坤 , 2021 , 35 (3) , 3122-3128 . |
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Abstract ：
A kind of needle-like sandwich-combined precipitation product (denoted as η) was found to be formed concurrently with the equilibrium β-phase in a Mg-Gd-Y alloy subjected to duplex aging at 200 °C and 250 °C, respectively, and its structure was characterized by high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) technique. It had been clearly revealed that the η-precipitate consists of a new base-centered orthogonal (BCO) precipitate as a long core (B) which is invariably sandwiched by the face-centered cubic (FCC) Gd(Y) solute precipitate platelets (F) as surface-shells. The orientation relationships involved with the unique F-B-F sandwiched precipitation for the η constructing in the Mg matrix were determined to be F//,B,{010}F//{010}B and F//Mg,{010}F//{101¯0}Mg, respectively. © 2020 Elsevier B.V.
Keyword ：
Precipitation (chemical) Precipitation (chemical) Scanning electron microscopy Scanning electron microscopy High resolution transmission electron microscopy High resolution transmission electron microscopy Ternary alloys Ternary alloys Magnesium alloys Magnesium alloys Gadolinium alloys Gadolinium alloys Magnesium metallography Magnesium metallography
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| GB/T 7714 | Liu, Lin-Lin , Sun, Wei . A kind of sandwich-combined precipitate formed in a duplex-aged Mg-Gd-Y alloy [J]. | Materials Letters , 2021 , 285 . |
| MLA | Liu, Lin-Lin et al. "A kind of sandwich-combined precipitate formed in a duplex-aged Mg-Gd-Y alloy" . | Materials Letters 285 (2021) . |
| APA | Liu, Lin-Lin , Sun, Wei . A kind of sandwich-combined precipitate formed in a duplex-aged Mg-Gd-Y alloy . | Materials Letters , 2021 , 285 . |
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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 ：
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 ：
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 ：
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 ：
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 ：
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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